Line data Source code
1 : /*
2 : * SPDX-License-Identifier: MPL-2.0
3 : *
4 : * This Source Code Form is subject to the terms of the Mozilla Public
5 : * License, v. 2.0. If a copy of the MPL was not distributed with this
6 : * file, You can obtain one at http://mozilla.org/MPL/2.0/.
7 : *
8 : * Copyright 2024 MonetDB Foundation;
9 : * Copyright August 2008 - 2023 MonetDB B.V.;
10 : * Copyright 1997 - July 2008 CWI.
11 : */
12 :
13 : #include "monetdb_config.h"
14 : #include "rel_optimizer_private.h"
15 : #include "rel_planner.h"
16 : #include "rel_exp.h"
17 : #include "rel_select.h"
18 : #include "rel_rewriter.h"
19 :
20 : /* Split_select optimizer splits case statements in select expressions. This is a step needed for cse */
21 : static void select_split_exps(mvc *sql, list *exps, sql_rel *rel);
22 :
23 : static sql_exp *
24 218375 : select_split_exp(mvc *sql, sql_exp *e, sql_rel *rel)
25 : {
26 218375 : switch(e->type) {
27 : case e_column:
28 : return e;
29 6913 : case e_convert:
30 6913 : e->l = select_split_exp(sql, e->l, rel);
31 6913 : return e;
32 24486 : case e_aggr:
33 : case e_func:
34 24486 : if (!is_analytic(e) && !exp_has_sideeffect(e)) {
35 24482 : sql_subfunc *f = e->f;
36 24482 : if (e->type == e_func && !f->func->s && is_caselike_func(f) /*is_ifthenelse_func(f)*/)
37 283 : return add_exp_too_project(sql, e, rel);
38 : }
39 : return e;
40 74603 : case e_cmp:
41 74603 : if (e->flag == cmp_or || e->flag == cmp_filter) {
42 18667 : select_split_exps(sql, e->l, rel);
43 18667 : select_split_exps(sql, e->r, rel);
44 55936 : } else if (e->flag == cmp_in || e->flag == cmp_notin) {
45 3260 : e->l = select_split_exp(sql, e->l, rel);
46 3260 : select_split_exps(sql, e->r, rel);
47 : } else {
48 52676 : e->l = select_split_exp(sql, e->l, rel);
49 52677 : e->r = select_split_exp(sql, e->r, rel);
50 52677 : if (e->f)
51 3590 : e->f = select_split_exp(sql, e->f, rel);
52 : }
53 : return e;
54 : case e_atom:
55 : case e_psm:
56 : return e;
57 : }
58 : return e;
59 : }
60 :
61 : static void
62 65268 : select_split_exps(mvc *sql, list *exps, sql_rel *rel)
63 : {
64 65268 : node *n;
65 :
66 65268 : if (!exps)
67 : return;
68 164528 : for(n=exps->h; n; n = n->next){
69 99259 : sql_exp *e = n->data;
70 :
71 99259 : e = select_split_exp(sql, e, rel);
72 99260 : n->data = e;
73 : }
74 : }
75 :
76 : static sql_rel *
77 1665534 : rel_split_select_(visitor *v, sql_rel *rel)
78 : {
79 1665534 : if (!rel || !is_select(rel->op) || list_empty(rel->exps) || !rel->l || mvc_highwater(v->sql))
80 1442970 : return rel;
81 :
82 222564 : bool funcs = false;
83 :
84 : /* are there functions */
85 476974 : for (node *n = rel->exps->h; n && !funcs; n = n->next)
86 254410 : funcs = exp_has_func(n->data);
87 :
88 : /* introduce extra project */
89 222564 : if (funcs) {
90 24675 : sql_rel *nrel = rel_project(v->sql->sa, rel->l,
91 24674 : rel_projections(v->sql, rel->l, NULL, 1, 1));
92 24675 : if (!nrel || !nrel->exps)
93 : return NULL;
94 24675 : rel->l = nrel;
95 : /* recursively split all functions and add those to the projection list */
96 24675 : select_split_exps(v->sql, rel->exps, nrel);
97 24675 : return rel;
98 : }
99 : return rel;
100 : }
101 :
102 : static sql_rel *
103 56863 : rel_split_select(visitor *v, global_props *gp, sql_rel *rel)
104 : {
105 56863 : (void) gp;
106 56863 : return rel_visitor_bottomup(v, rel, &rel_split_select_);
107 : }
108 :
109 : run_optimizer
110 629555 : bind_split_select(visitor *v, global_props *gp)
111 : {
112 629555 : int flag = v->sql->sql_optimizer;
113 552864 : return gp->opt_cycle == 0 && gp->opt_level == 1 && (flag & split_select)
114 1182411 : && gp->cnt[op_select] ? rel_split_select : NULL;
115 : }
116 :
117 :
118 : /*
119 : * Remove a redundant join
120 : *
121 : * join (L, Distinct Project(join(L,P) [ p.key == l.lkey]) [p.key]) [ p.key == l.lkey]
122 : * =>
123 : * join(L, P) [p.key==l.lkey]
124 : */
125 : static sql_rel *
126 1479341 : rel_remove_redundant_join_(visitor *v, sql_rel *rel)
127 : {
128 1479341 : if ((is_join(rel->op) || is_semi(rel->op)) && !list_empty(rel->exps)) {
129 220006 : sql_rel *l = rel->l, *r = rel->r, *b, *p = NULL, *j;
130 :
131 220006 : if (is_basetable(l->op) && is_simple_project(r->op) && need_distinct(r)) {
132 8 : b = l;
133 8 : p = r;
134 8 : j = p->l;
135 219998 : } else if (is_basetable(r->op) && is_simple_project(l->op) && need_distinct(l)) {
136 2333 : b = r;
137 2333 : p = l;
138 2333 : j = p->l;
139 : }
140 220006 : if (!p || !j || j->op != rel->op)
141 : return rel;
142 : /* j must have b->l (ie table) */
143 12 : sql_rel *jl = j->l, *jr = j->r;
144 12 : if ((is_basetable(jl->op) && jl->l == b->l) ||
145 8 : (is_basetable(jr->op) && jr->l == b->l)) {
146 11 : int left = 0;
147 11 : if (is_basetable(jl->op) && jl->l == b->l)
148 11 : left = 1;
149 11 : if (!list_empty(p->exps)) {
150 19 : for (node *n=p->exps->h; n; n = n->next) { /* all exps of 'p' must be bound to the opposite side */
151 11 : sql_exp *e = n->data;
152 :
153 18 : if (!rel_rebind_exp(v->sql, left ? jr : jl, e))
154 : return rel;
155 : }
156 : }
157 8 : if (exp_match_list(j->exps, rel->exps)) {
158 0 : p->l = (left)?rel_dup(jr):rel_dup(jl);
159 0 : rel_destroy(j);
160 0 : set_nodistinct(p);
161 0 : v->changes++;
162 0 : return rel;
163 : }
164 : }
165 : }
166 : return rel;
167 : }
168 :
169 : static sql_rel *
170 49095 : rel_remove_redundant_join(visitor *v, global_props *gp, sql_rel *rel)
171 : {
172 49095 : (void) gp;
173 49095 : return rel_visitor_bottomup(v, rel, &rel_remove_redundant_join_); /* this optimizer has to run before rel_first_level_optimizations */
174 : }
175 :
176 : run_optimizer
177 629492 : bind_remove_redundant_join(visitor *v, global_props *gp)
178 : {
179 629492 : int flag = v->sql->sql_optimizer;
180 552941 : return gp->opt_cycle == 0 && gp->opt_level == 1 && (gp->cnt[op_left] || gp->cnt[op_right]
181 534420 : || gp->cnt[op_full] || gp->cnt[op_join] || gp->cnt[op_semi] || gp->cnt[op_anti]) &&
182 678328 : (flag & remove_redundant_join) ? rel_remove_redundant_join : NULL;
183 : }
184 :
185 :
186 : static list *
187 1125473 : exp_merge_range(visitor *v, sql_rel *rel, list *exps)
188 : {
189 1125473 : node *n, *m;
190 2419304 : for (n=exps->h; n; n = n->next) {
191 1295726 : sql_exp *e = n->data;
192 1295726 : sql_exp *le = e->l;
193 1295726 : sql_exp *re = e->r;
194 :
195 : /* handle the and's in the or lists */
196 1295726 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e)) {
197 43163 : e->l = exp_merge_range(v, rel, e->l);
198 43163 : e->r = exp_merge_range(v, rel, e->r);
199 : /* only look for gt, gte, lte, lt */
200 1252563 : } else if (n->next &&
201 166052 : e->type == e_cmp && e->flag < cmp_equal && !e->f &&
202 6822 : re->card == CARD_ATOM && !is_anti(e)) {
203 1274 : for (m=n->next; m; m = m->next) {
204 781 : sql_exp *f = m->data;
205 781 : sql_exp *lf = f->l;
206 781 : sql_exp *rf = f->r;
207 781 : int c_le = is_numeric_upcast(le), c_lf = is_numeric_upcast(lf);
208 :
209 781 : if (f->type == e_cmp && f->flag < cmp_equal && !f->f &&
210 649 : rf->card == CARD_ATOM && !is_anti(f) &&
211 324 : exp_match_exp(c_le?le->l:le, c_lf?lf->l:lf)) {
212 174 : sql_exp *ne;
213 174 : int swap = 0, lt = 0, gt = 0;
214 174 : sql_subtype super;
215 : /* for now only c1 <[=] x <[=] c2 */
216 :
217 174 : swap = lt = (e->flag == cmp_lt || e->flag == cmp_lte);
218 174 : gt = !lt;
219 :
220 174 : if (gt &&
221 150 : (f->flag == cmp_gt ||
222 : f->flag == cmp_gte))
223 32 : continue;
224 24 : if (lt &&
225 24 : (f->flag == cmp_lt ||
226 : f->flag == cmp_lte))
227 0 : continue;
228 :
229 142 : cmp_supertype(&super, exp_subtype(le), exp_subtype(lf));
230 142 : if (!(rf = exp_check_type(v->sql, &super, rel, rf, type_equal)) ||
231 142 : !(le = exp_check_type(v->sql, &super, rel, le, type_equal)) ||
232 142 : !(re = exp_check_type(v->sql, &super, rel, re, type_equal))) {
233 0 : v->sql->session->status = 0;
234 0 : v->sql->errstr[0] = 0;
235 0 : continue;
236 : }
237 142 : if (!swap)
238 118 : ne = exp_compare2(v->sql->sa, le, re, rf, compare2range(e->flag, f->flag), 0);
239 : else
240 24 : ne = exp_compare2(v->sql->sa, le, rf, re, compare2range(f->flag, e->flag), 0);
241 :
242 142 : list_remove_data(exps, NULL, e);
243 142 : list_remove_data(exps, NULL, f);
244 142 : list_append(exps, ne);
245 142 : v->changes++;
246 142 : return exp_merge_range(v, rel, exps);
247 : }
248 : }
249 1251928 : } else if (n->next &&
250 165417 : e->type == e_cmp && e->flag < cmp_equal && !e->f &&
251 6187 : re->card > CARD_ATOM && !is_anti(e)) {
252 11218 : for (m=n->next; m; m = m->next) {
253 6784 : sql_exp *f = m->data;
254 6784 : sql_exp *lf = f->l;
255 6784 : sql_exp *rf = f->r;
256 :
257 6784 : if (f->type == e_cmp && f->flag < cmp_equal && !f->f &&
258 4979 : rf->card > CARD_ATOM && !is_anti(f)) {
259 4978 : sql_exp *ne, *t;
260 4978 : int swap = 0, lt = 0, gt = 0;
261 4978 : comp_type ef = (comp_type) e->flag, ff = (comp_type) f->flag;
262 4978 : int c_re = is_numeric_upcast(re), c_rf = is_numeric_upcast(rf);
263 4978 : int c_le = is_numeric_upcast(le), c_lf = is_numeric_upcast(lf), c;
264 4978 : sql_subtype super;
265 :
266 : /* both swapped ? */
267 4978 : if (exp_match_exp(c_re?re->l:re, c_rf?rf->l:rf)) {
268 19 : t = re;
269 19 : re = le;
270 19 : le = t;
271 19 : c = c_re; c_re = c_le; c_le = c;
272 19 : ef = swap_compare(ef);
273 19 : t = rf;
274 19 : rf = lf;
275 19 : lf = t;
276 19 : c = c_rf; c_rf = c_lf; c_lf = c;
277 19 : ff = swap_compare(ff);
278 : }
279 :
280 : /* is left swapped ? */
281 4978 : if (exp_match_exp(c_re?re->l:re, c_lf?lf->l:lf)) {
282 104 : t = re;
283 104 : re = le;
284 104 : le = t;
285 104 : c = c_re; c_re = c_le; c_le = c;
286 104 : ef = swap_compare(ef);
287 : }
288 :
289 : /* is right swapped ? */
290 4978 : if (exp_match_exp(c_le?le->l:le, c_rf?rf->l:rf)) {
291 177 : t = rf;
292 177 : rf = lf;
293 177 : lf = t;
294 177 : c = c_rf; c_rf = c_lf; c_lf = c;
295 177 : ff = swap_compare(ff);
296 : }
297 :
298 4978 : if (!exp_match_exp(c_le?le->l:le, c_lf?lf->l:lf))
299 3225 : continue;
300 :
301 : /* for now only c1 <[=] x <[=] c2 */
302 1830 : swap = lt = (ef == cmp_lt || ef == cmp_lte);
303 1830 : gt = !lt;
304 :
305 1830 : if (gt && (ff == cmp_gt || ff == cmp_gte))
306 73 : continue;
307 1757 : if (lt && (ff == cmp_lt || ff == cmp_lte))
308 4 : continue;
309 :
310 1753 : cmp_supertype(&super, exp_subtype(le), exp_subtype(lf));
311 1753 : if (!(rf = exp_check_type(v->sql, &super, rel, rf, type_equal)) ||
312 1753 : !(le = exp_check_type(v->sql, &super, rel, le, type_equal)) ||
313 1753 : !(re = exp_check_type(v->sql, &super, rel, re, type_equal))) {
314 0 : v->sql->session->status = 0;
315 0 : v->sql->errstr[0] = 0;
316 0 : continue;
317 : }
318 1753 : if (!swap)
319 1653 : ne = exp_compare2(v->sql->sa, le, re, rf, compare2range(ef, ff), 0);
320 : else
321 100 : ne = exp_compare2(v->sql->sa, le, rf, re, compare2range(ff, ef), 0);
322 :
323 1753 : list_remove_data(exps, NULL, e);
324 1753 : list_remove_data(exps, NULL, f);
325 1753 : list_append(exps, ne);
326 1753 : v->changes++;
327 1753 : return exp_merge_range(v, rel, exps);
328 : }
329 : }
330 : }
331 : }
332 : return exps;
333 : }
334 :
335 : static int
336 39581 : exps_cse( mvc *sql, list *oexps, list *l, list *r )
337 : {
338 39581 : list *nexps;
339 39581 : node *n, *m;
340 39581 : char *lu, *ru;
341 39581 : int lc = 0, rc = 0, match = 0, res = 0;
342 :
343 39581 : if (list_length(l) == 0 || list_length(r) == 0)
344 0 : return 0;
345 :
346 : /* first recursive exps_cse */
347 39581 : nexps = new_exp_list(sql->sa);
348 82960 : for (n = l->h; n; n = n->next) {
349 43379 : sql_exp *e = n->data;
350 :
351 43379 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e)) {
352 15107 : res = exps_cse(sql, nexps, e->l, e->r);
353 : } else {
354 28272 : append(nexps, e);
355 : }
356 : }
357 39581 : l = nexps;
358 :
359 39581 : nexps = new_exp_list(sql->sa);
360 86145 : for (n = r->h; n; n = n->next) {
361 46564 : sql_exp *e = n->data;
362 :
363 46564 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e)) {
364 2142 : res = exps_cse(sql, nexps, e->l, e->r);
365 : } else {
366 44422 : append(nexps, e);
367 : }
368 : }
369 39581 : r = nexps;
370 :
371 : /* simplify true or .. and .. or true */
372 39581 : if (list_length(l) == list_length(r) && list_length(l) == 1) {
373 35051 : sql_exp *le = l->h->data, *re = r->h->data;
374 :
375 35051 : if (exp_is_true(le)) {
376 14 : append(oexps, le);
377 14 : return 1;
378 : }
379 35037 : if (exp_is_true(re)) {
380 5 : append(oexps, re);
381 5 : return 1;
382 : }
383 : }
384 :
385 39562 : lu = SA_ZNEW_ARRAY(sql->ta, char, list_length(l));
386 39562 : ru = SA_ZNEW_ARRAY(sql->ta, char, list_length(r));
387 82939 : for (n = l->h, lc = 0; n; n = n->next, lc++) {
388 43377 : sql_exp *le = n->data;
389 :
390 95733 : for ( m = r->h, rc = 0; m; m = m->next, rc++) {
391 52356 : sql_exp *re = m->data;
392 :
393 52356 : if (!ru[rc] && exp_match_exp(le,re)) {
394 68 : lu[lc] = 1;
395 68 : ru[rc] = 1;
396 68 : match = 1;
397 : }
398 : }
399 : }
400 39562 : if (match) {
401 49 : list *nl = new_exp_list(sql->sa);
402 49 : list *nr = new_exp_list(sql->sa);
403 :
404 162 : for (n = l->h, lc = 0; n; n = n->next, lc++)
405 113 : if (!lu[lc])
406 49 : append(nl, n->data);
407 176 : for (n = r->h, rc = 0; n; n = n->next, rc++)
408 127 : if (!ru[rc])
409 59 : append(nr, n->data);
410 :
411 49 : if (list_length(nl) && list_length(nr))
412 23 : append(oexps, exp_or(sql->sa, nl, nr, 0));
413 :
414 162 : for (n = l->h, lc = 0; n; n = n->next, lc++) {
415 113 : if (lu[lc])
416 64 : append(oexps, n->data);
417 : }
418 : res = 1;
419 : } else {
420 39513 : append(oexps, exp_or(sql->sa, list_dup(l, (fdup)NULL),
421 : list_dup(r, (fdup)NULL), 0));
422 : }
423 : return res;
424 : }
425 :
426 : static inline int
427 23320 : exp_col_key(sql_exp *e)
428 : {
429 17579 : return e->nid ? e->nid : e->alias.label;
430 : }
431 :
432 : static inline int
433 5765 : exp_cmp_eq_unique_id(sql_exp *e)
434 : {
435 5765 : return exp_col_key(e->l);
436 : }
437 :
438 : static inline int
439 1768 : exp_multi_col_key(list *l)
440 : {
441 1768 : int k = exp_col_key(l->h->data);
442 5765 : for (node *n = l->h->next; n; n = n->next) {
443 3997 : k <<= 4;
444 7994 : k ^= exp_col_key(n->data);
445 : }
446 1768 : return k;
447 : }
448 :
449 : typedef struct exp_eq_col_values {
450 : /* we need ->first in order to remove it from the list of cmp_eq exps
451 : * in case that we find another occurrence (with a different value)
452 : */
453 : sql_exp* first;
454 : sql_exp* col; /* column */
455 : list *vs; /* list of values */
456 : } eq_cv;
457 :
458 : typedef struct exp_eq_multi_col_values {
459 : /* we need ->first in order to remove it from the list of multi col
460 : * cmp_eq exps in case that we find another occurrence (with different values)
461 : */
462 : list *first;
463 : list *cols; /* list of col exps */
464 : list *lvs; /* list of lists of values */
465 : } eq_mcv;
466 :
467 : static bool
468 4276 : detect_col_cmp_eqs(mvc *sql, list *eqs, sql_hash *eqh)
469 : {
470 4276 : bool col_multivalue_cmp_eq = false;
471 16066 : for (node *n = eqs->h; n; n = n->next ) {
472 11790 : sql_exp *e = n->data;
473 11790 : sql_exp *le = e->l, *re = e->r;
474 :
475 : /* find the le in the hash and append the re in the hash value (ea->list) */
476 11790 : bool found = false;
477 :
478 11790 : int key = eqh->key(le);
479 11790 : sql_hash_e *he = eqh->buckets[key&(eqh->size-1)];
480 :
481 14686 : for (;he && !found; he = he->chain) {
482 2896 : eq_cv *cv = he->value;
483 2896 : if (!exp_equal(le, cv->col)) {
484 2896 : cv->vs = append(cv->vs, re);
485 2896 : found = col_multivalue_cmp_eq = true;
486 : /* remove this and the previous (->first) occurrence (if exists) from eqs */
487 2896 : if (cv->first) {
488 1793 : list_remove_data(eqs, NULL, cv->first);
489 1793 : cv->first = NULL;
490 : }
491 2896 : list_remove_node(eqs, NULL, n);
492 : }
493 : }
494 :
495 11790 : if (!found) {
496 8894 : eq_cv *cv = SA_NEW(sql->sa, eq_cv);
497 8894 : cv->first = e;
498 8894 : cv->vs = sa_list(sql->sa);
499 8894 : cv->vs = append(cv->vs, re);
500 8894 : cv->col = le;
501 :
502 8894 : hash_add(eqh, key, cv);
503 : }
504 : }
505 4276 : return col_multivalue_cmp_eq;
506 : }
507 :
508 : static bool
509 692 : detect_multicol_cmp_eqs(mvc *sql, list *mce_ands, sql_hash *meqh)
510 : {
511 : /* we get as input a list of AND associated expressions (hence the entries are lists themselves)
512 : * we need to detect cmp_eq-only AND-associated expressions with the same columns so we can
513 : * group together their values
514 : * e.g. [[n = 1, m = 10], [m = 20, k = 100, l = 3000], [m = 20, n = 2]] has
515 : * - (m,k,l) group with a single value (20, 100, 3000)
516 : * - (n,k) group with two values (1, 10) and (2, 20)
517 : * at the end we return true only if we have at least a group of columns with more than a single value
518 : * e.g. in this example (n,k)
519 : */
520 692 : bool multi_multivalue_cmp_eq = false;
521 2460 : for (node *n = mce_ands->h; n; n = n->next) {
522 1768 : list *l = n->data;
523 :
524 : /* sort the list of the cmp_eq expressions based on the col exp
525 : * NOTE: from now on we only work with the sorted list, sl */
526 1768 : list *sl = list_sort(l, (fkeyvalue)&exp_cmp_eq_unique_id, NULL);
527 1768 : list_append_before(mce_ands, n, sl);
528 1768 : list_remove_node(mce_ands, NULL, n);
529 :
530 : /* find the eq exp in the hash and append the values */
531 1768 : bool found = false;
532 :
533 1768 : int key = meqh->key(sl);
534 1768 : sql_hash_e *he = meqh->buckets[key&(meqh->size-1)];
535 :
536 2866 : for (;he && !found; he = he->chain) {
537 : /* compare the values of the hash_entry with the cols under cmp_eq from the list */
538 1098 : bool same_cols = true;
539 1098 : eq_mcv *mcv = he->value;
540 3479 : for (node *m = sl->h, *k = mcv->cols->h; m && k && same_cols; m = m->next, k = k->next) {
541 2381 : sql_exp *col_exp = ((sql_exp*)m->data)->l;
542 2381 : if (exp_equal(col_exp, k->data))
543 663 : same_cols = false;
544 : }
545 1098 : if (same_cols) {
546 : /* we found the same multi cmp_eq exp in mce_ands list multiple times! */
547 435 : found = multi_multivalue_cmp_eq = true;
548 : /* gather all the values of the list and add them to the hash entry */
549 435 : list *atms = sa_list(sql->sa);
550 1783 : for (node *m = sl->h; m; m = m->next)
551 1348 : atms = append(atms, ((sql_exp*)m->data)->r);
552 435 : mcv->lvs = append(mcv->lvs, atms);
553 : /* remove this and the previous occurrence (which means that's the first time
554 : * that we found the *same* multi cmp_eq exp)
555 : */
556 435 : if (mcv->first) {
557 80 : list_remove_data(mce_ands, NULL, mcv->first);
558 80 : mcv->first = NULL;
559 : }
560 435 : list_remove_data(mce_ands, NULL, sl);
561 : }
562 : }
563 :
564 1768 : if (!found) {
565 1333 : eq_mcv *mcv = SA_NEW(sql->sa, eq_mcv);
566 1333 : mcv->first = sl;
567 1333 : mcv->cols = sa_list(sql->sa);
568 5750 : for (node *m = sl->h; m; m = m->next)
569 4417 : mcv->cols = append(mcv->cols, ((sql_exp*)m->data)->l);
570 : /* for the list of values (atoms) create a list and append it to the lvs list */
571 1333 : list *atms = sa_list(sql->sa);
572 5750 : for (node *m = sl->h; m; m = m->next)
573 4417 : atms = append(atms, ((sql_exp*)m->data)->r);
574 1333 : mcv->lvs = sa_list(sql->sa);
575 1333 : mcv->lvs = append(mcv->lvs, atms);
576 :
577 1333 : hash_add(meqh, key, mcv);
578 : }
579 : }
580 692 : return multi_multivalue_cmp_eq;
581 : }
582 :
583 : static void
584 65923 : exp_or_chain_groups(mvc *sql, list *exps, list **gen_ands, list **mce_ands, list **eqs, list **noneq)
585 : {
586 : /* identify three different groups
587 : * 1. gen_ands: lists of generic expressions (their inner association is AND)
588 : * 2. mce_ands: lists of multi_colum cmp_eq ONLY expressions (same^^^)
589 : * 3. eqs: equality expressions
590 : * 4. neq: non equality col expressions
591 : *
592 : * return true if there is an exp with more than one cmp_eq
593 : */
594 85316 : bool eq_only = true;
595 182137 : for (node *n = exps->h; n && eq_only; n = n->next) {
596 96821 : sql_exp *e = n->data;
597 96821 : sql_exp *le = e->l, *re = e->r;
598 193391 : eq_only &= (e->type == e_cmp && e->flag == cmp_equal &&
599 34408 : le->card != CARD_ATOM && is_column(le->type) &&
600 130075 : re->card == CARD_ATOM && !is_semantics(e));
601 : }
602 :
603 85316 : if (list_length(exps) > 1) {
604 5401 : if (eq_only)
605 4520 : *mce_ands = append(*mce_ands, exps);
606 : else
607 881 : *gen_ands = append(*gen_ands, exps);
608 79915 : } else if (list_length(exps) == 1) {
609 79915 : sql_exp *se = exps->h->data;
610 79915 : sql_exp *le = se->l, *re = se->r;
611 :
612 79915 : if (se->type == e_cmp && se->flag == cmp_or && !is_anti(se)) {
613 : /* for a cmp_or expression go down the tree */
614 19393 : exp_or_chain_groups(sql, (list*)le, gen_ands, mce_ands, eqs, noneq);
615 19393 : exp_or_chain_groups(sql, (list*)re, gen_ands, mce_ands, eqs, noneq);
616 :
617 60522 : } else if (eq_only) {
618 15426 : *eqs = append(*eqs, se);
619 : } else {
620 45096 : *noneq = append(*noneq, se);
621 : }
622 : }
623 65923 : }
624 :
625 : static list *
626 1686 : generate_single_col_cmp_in(mvc *sql, sql_hash *eqh)
627 : {
628 : /* from single col cmp_eq with multiple atoms in the hash generate
629 : * "e_col in (val0, val1, ...)" (see detect_col_cmp_eqs())
630 : */
631 1686 : list *ins = new_exp_list(sql->sa);
632 55638 : for (int i = 0; i < eqh->size; i++) {
633 53952 : sql_hash_e *he = eqh->buckets[i];
634 :
635 56592 : while (he) {
636 2640 : eq_cv *cv = he->value;
637 : /* NOTE: cmp_eq expressions with a single entry are still in eqs */
638 2640 : if (list_length(cv->vs) > 1)
639 1793 : ins = append(ins, exp_in(sql->sa, cv->col, cv->vs, cmp_in));
640 2640 : he = he->chain;
641 : }
642 : }
643 1686 : return ins;
644 : }
645 :
646 : static list *
647 80 : generate_multi_col_cmp_in(mvc *sql, sql_hash *meqh)
648 : {
649 : /* from multivalue cmp_eq with multiple lists of atoms in the hash generate
650 : * "(col1, col2, ...) in [(val10, val20, ...), (val11, val21, ...), ... ]"
651 : * (see detect_multicol_cmp_eqs())
652 : */
653 80 : list *ins = new_exp_list(sql->sa);
654 2640 : for (int i = 0; i < meqh->size; i++) {
655 2560 : sql_hash_e *he = meqh->buckets[i];
656 2654 : while (he) {
657 94 : eq_mcv *mcv = he->value;
658 : /* NOTE: multivalue cmp_eq expressions with a single entry are still in mce_ands */
659 94 : if (list_length(mcv->lvs) > 1) {
660 80 : sql_exp *mc = exp_label(sql->sa, exp_values(sql->sa, mcv->cols), ++sql->label);
661 595 : for (node *a = mcv->lvs->h; a; a = a->next)
662 515 : a->data = exp_values(sql->sa, a->data);
663 80 : ins = append(ins, exp_in(sql->sa, mc, mcv->lvs, cmp_in));
664 : }
665 94 : he = he->chain;
666 : }
667 : }
668 80 : return ins;
669 : }
670 :
671 : static list *
672 522176 : merge_ors(mvc *sql, list *exps, int *changes)
673 : {
674 522176 : sql_hash *eqh = NULL, *meqh = NULL;
675 522176 : list *eqs = NULL, *neq = NULL, *gen_ands = NULL, *mce_ands = NULL, *ins = NULL, *mins = NULL;
676 1123812 : for (node *n = exps->h; n; n = n->next) {
677 601636 : sql_exp *e = n->data;
678 :
679 601636 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e)) {
680 : /* NOTE: gen_ands and mce_ands are both a list of lists since the AND association
681 : * between expressions is expressed with a list
682 : * e.g. [[e1, e2], [e3, e4, e5]] semantically translates
683 : * to [(e1 AND e2), (e3 AND e4 AND e5)]
684 : * those (internal) AND list can be then used to
685 : * reconstructed an OR tree [[e1, e2], [e3, e4, e5]] =>
686 : * (([e1, e2] OR [e3, e4, e5]) OR <whatever-else> )
687 : * gen_ands includes general expressions associated with AND
688 : * mce_ands includes only cmp_eq expressions associated with AND
689 : */
690 23265 : gen_ands = new_exp_list(sql->sa);
691 23265 : mce_ands = new_exp_list(sql->sa);
692 23265 : eqs = new_exp_list(sql->sa);
693 23265 : neq = new_exp_list(sql->sa);
694 :
695 : /* walk the OR tree */
696 23265 : exp_or_chain_groups(sql, e->l, &gen_ands, &mce_ands, &eqs, &neq);
697 23265 : exp_or_chain_groups(sql, e->r, &gen_ands, &mce_ands, &eqs, &neq);
698 :
699 : /* detect col cmp_eq exps with multiple values */
700 23265 : bool col_multival = false;
701 23265 : if (list_length(eqs) > 1) {
702 4276 : eqh = hash_new(sql->sa, 32, (fkeyvalue)&exp_col_key);
703 4276 : col_multival = detect_col_cmp_eqs(sql, eqs, eqh);
704 : }
705 :
706 : /* detect mutli-col cmp_eq exps with multiple (lists of) values */
707 23265 : bool multicol_multival = false;
708 23265 : if (list_length(mce_ands) > 1) {
709 692 : meqh = hash_new(sql->sa, 32, (fkeyvalue)&exp_multi_col_key);
710 692 : multicol_multival = detect_multicol_cmp_eqs(sql, mce_ands, meqh);
711 : }
712 :
713 23265 : if (!col_multival && !multicol_multival)
714 21508 : continue;
715 :
716 1757 : if (col_multival)
717 1686 : ins = generate_single_col_cmp_in(sql, eqh);
718 :
719 1757 : if (multicol_multival)
720 80 : mins = generate_multi_col_cmp_in(sql, meqh);
721 :
722 : /* create the new OR tree */
723 1757 : sql_exp *new = (ins) ? ins->h->data : mins->h->data;
724 :
725 71 : if (ins) {
726 1793 : for (node *i = ins->h->next; i; i = i->next) {
727 107 : list *l = new_exp_list(sql->sa);
728 107 : list *r = new_exp_list(sql->sa);
729 107 : l = append(l, new);
730 107 : r = append(r, (sql_exp*)i->data);
731 107 : new = exp_or(sql->sa, l, r, 0);
732 :
733 107 : (*changes)++;
734 : }
735 : }
736 :
737 1757 : if (list_length(eqs)) {
738 1448 : for (node *i = eqs->h; i; i = i->next) {
739 872 : list *l = new_exp_list(sql->sa);
740 872 : list *r = new_exp_list(sql->sa);
741 872 : l = append(l, new);
742 872 : r = append(r, (sql_exp*)i->data);
743 872 : new = exp_or(sql->sa, l, r, 0);
744 : }
745 : }
746 :
747 1757 : if (mins) {
748 169 : for (node *i = ((ins) ? mins->h : mins->h->next); i; i = i->next) {
749 9 : list *l = new_exp_list(sql->sa);
750 9 : list *r = new_exp_list(sql->sa);
751 9 : l = append(l, new);
752 9 : r = append(r, (sql_exp*)i->data);
753 9 : new = exp_or(sql->sa, l, r, 0);
754 :
755 9 : (*changes)++;
756 : }
757 : }
758 :
759 1757 : if (list_length(mce_ands)) {
760 523 : for (node *i = mce_ands->h; i; i = i->next) {
761 273 : list *l = new_exp_list(sql->sa);
762 273 : l = append(l, new);
763 273 : new = exp_or(sql->sa, l, i->data, 0);
764 : }
765 : }
766 :
767 1760 : for (node *a = gen_ands->h; a; a = a->next){
768 3 : list *l = new_exp_list(sql->sa);
769 3 : l = append(l, new);
770 3 : new = exp_or(sql->sa, l, a->data, 0);
771 : }
772 :
773 2075 : for (node *o = neq->h; o; o = o->next){
774 318 : list *l = new_exp_list(sql->sa);
775 318 : list *r = new_exp_list(sql->sa);
776 318 : l = append(l, new);
777 318 : r = append(r, (sql_exp*)o->data);
778 318 : new = exp_or(sql->sa, l, r, 0);
779 : }
780 :
781 1757 : list_remove_node(exps, NULL, n);
782 1757 : exps = append(exps, new);
783 : }
784 : }
785 522176 : return exps;
786 : }
787 :
788 : #define TRIVIAL_NOT_EQUAL_CMP(e) \
789 : ((e)->type == e_cmp && (e)->flag == cmp_notequal && !is_anti((e)) && !is_semantics((e)) && ((sql_exp*)(e)->l)->card != CARD_ATOM && ((sql_exp*)(e)->r)->card == CARD_ATOM)
790 :
791 : static list *
792 601318 : merge_notequal(mvc *sql, list *exps, int *changes)
793 : {
794 601318 : list *inequality_groups = NULL, *nexps = NULL;
795 601318 : int needed = 0;
796 :
797 1292446 : for (node *n = exps->h; n; n = n->next) {
798 691128 : sql_exp *e = n->data;
799 :
800 691128 : if (TRIVIAL_NOT_EQUAL_CMP(e)) {
801 82799 : bool appended = false;
802 :
803 82799 : if (inequality_groups) {
804 9095 : for (node *m = inequality_groups->h; m && !appended; m = m->next) {
805 5212 : list *next = m->data;
806 5212 : sql_exp *first = (sql_exp*) next->h->data;
807 :
808 5212 : if (exp_match(first->l, e->l)) {
809 1166 : list_append(next, e);
810 1166 : appended = true;
811 : }
812 : }
813 : }
814 3883 : if (!appended) {
815 81633 : if (!inequality_groups)
816 78916 : inequality_groups = new_exp_list(sql->sa);
817 81633 : list_append(inequality_groups, list_append(new_exp_list(sql->sa), e));
818 : }
819 : }
820 : }
821 :
822 601318 : if (inequality_groups) { /* if one list of inequalities has more than one entry, then the re-write is needed */
823 160549 : for (node *n = inequality_groups->h; n; n = n->next) {
824 81633 : list *next = n->data;
825 :
826 81633 : if (list_length(next) > 1)
827 1081 : needed = 1;
828 : }
829 : }
830 :
831 78916 : if (needed) {
832 999 : nexps = new_exp_list(sql->sa);
833 2614 : for (node *n = inequality_groups->h; n; n = n->next) {
834 1615 : list *next = n->data;
835 1615 : sql_exp *first = (sql_exp*) next->h->data;
836 :
837 1615 : if (list_length(next) > 1) {
838 1081 : list *notin = new_exp_list(sql->sa);
839 :
840 3328 : for (node *m = next->h; m; m = m->next) {
841 2247 : sql_exp *e = m->data;
842 2247 : list_append(notin, e->r);
843 : }
844 1081 : list_append(nexps, exp_in(sql->sa, first->l, notin, cmp_notin));
845 : } else {
846 534 : list_append(nexps, first);
847 : }
848 : }
849 :
850 4138 : for (node *n = exps->h; n; n = n->next) {
851 3139 : sql_exp *e = n->data;
852 :
853 3139 : if (!TRIVIAL_NOT_EQUAL_CMP(e))
854 358 : list_append(nexps, e);
855 : }
856 999 : (*changes)++;
857 : } else {
858 : nexps = exps;
859 : }
860 :
861 1291281 : for (node *n = nexps->h; n ; n = n->next) {
862 689963 : sql_exp *e = n->data;
863 :
864 689963 : if (e->type == e_cmp && e->flag == cmp_or) {
865 39572 : e->l = merge_notequal(sql, e->l, changes);
866 39572 : e->r = merge_notequal(sql, e->r, changes);
867 : }
868 : }
869 :
870 601318 : return nexps;
871 : }
872 :
873 : int
874 175232 : is_numeric_upcast(sql_exp *e)
875 : {
876 175232 : if (is_convert(e->type)) {
877 4698 : sql_subtype *f = exp_fromtype(e);
878 4698 : sql_subtype *t = exp_totype(e);
879 :
880 4698 : if (f->type->eclass == t->type->eclass && EC_COMPUTE(f->type->eclass)) {
881 1638 : if (f->type->localtype < t->type->localtype)
882 1618 : return 1;
883 : }
884 : }
885 : return 0;
886 : }
887 :
888 : /* optimize (a = b) or (a is null and b is null) -> a = b with null semantics */
889 : static sql_exp *
890 44706 : try_rewrite_equal_or_is_null(mvc *sql, sql_rel *rel, sql_exp *or, list *l1, list *l2)
891 : {
892 44706 : if (list_length(l1) == 1) {
893 41344 : bool valid = true, first_is_null_found = false, second_is_null_found = false;
894 41344 : sql_exp *cmp = l1->h->data;
895 41344 : sql_exp *first = cmp->l, *second = cmp->r;
896 :
897 41344 : if (is_compare(cmp->type) && !is_anti(cmp) && !cmp->f && cmp->flag == cmp_equal) {
898 7200 : int fupcast = is_numeric_upcast(first), supcast = is_numeric_upcast(second);
899 14424 : for(node *n = l2->h ; n && valid; n = n->next) {
900 7224 : sql_exp *e = n->data, *l = e->l, *r = e->r;
901 :
902 7224 : if (is_compare(e->type) && e->flag == cmp_equal && !e->f &&
903 4190 : !is_anti(e) && is_semantics(e)) {
904 1379 : int lupcast = is_numeric_upcast(l);
905 1379 : int rupcast = is_numeric_upcast(r);
906 1379 : sql_exp *rr = rupcast ? r->l : r;
907 :
908 1379 : if (rr->type == e_atom && rr->l && atom_null(rr->l)) {
909 1379 : if (exp_match_exp(fupcast?first->l:first, lupcast?l->l:l))
910 : first_is_null_found = true;
911 121 : else if (exp_match_exp(supcast?second->l:second, lupcast?l->l:l))
912 : second_is_null_found = true;
913 : else
914 5942 : valid = false;
915 : } else {
916 : valid = false;
917 : }
918 : } else {
919 : valid = false;
920 : }
921 : }
922 7200 : if (valid && first_is_null_found && second_is_null_found) {
923 21 : sql_subtype super;
924 :
925 21 : cmp_supertype(&super, exp_subtype(first), exp_subtype(second)); /* first and second must have the same type */
926 21 : if (!(first = exp_check_type(sql, &super, rel, first, type_equal)) ||
927 21 : !(second = exp_check_type(sql, &super, rel, second, type_equal))) {
928 0 : sql->session->status = 0;
929 0 : sql->errstr[0] = 0;
930 0 : return or;
931 : }
932 21 : sql_exp *res = exp_compare(sql->sa, first, second, cmp->flag);
933 21 : set_semantics(res);
934 21 : if (exp_name(or))
935 0 : exp_prop_alias(sql->sa, res, or);
936 21 : return res;
937 : }
938 : }
939 : }
940 : return or;
941 : }
942 :
943 : static list *
944 1037253 : merge_cmp_or_null(mvc *sql, sql_rel *rel, list *exps, int *changes)
945 : {
946 2231090 : for (node *n = exps->h; n ; n = n->next) {
947 1193837 : sql_exp *e = n->data;
948 :
949 1193837 : if (is_compare(e->type) && e->flag == cmp_or && !is_anti(e)) {
950 22353 : sql_exp *ne = try_rewrite_equal_or_is_null(sql, rel, e, e->l, e->r);
951 22353 : if (ne != e) {
952 19 : (*changes)++;
953 19 : n->data = ne;
954 : }
955 22353 : ne = try_rewrite_equal_or_is_null(sql, rel, e, e->r, e->l);
956 22353 : if (ne != e) {
957 2 : (*changes)++;
958 2 : n->data = ne;
959 : }
960 : }
961 : }
962 1037253 : return exps;
963 : }
964 :
965 : static list *
966 1037252 : cleanup_equal_exps(mvc *sql, sql_rel *rel, list *exps, int *changes)
967 : {
968 1037252 : if (list_length(exps) <= 1)
969 : return exps;
970 142363 : if (is_join(rel->op)) {
971 212811 : for(node *n = exps->h; n; n = n->next) {
972 143111 : sql_exp *e = n->data;
973 286053 : if (e->type == e_cmp && !e->f && e->flag <= cmp_notequal &&
974 185277 : !rel_find_exp(rel->l, e->l) && !rel_find_exp(rel->r, e->r) &&
975 42161 : !find_prop(e->p, PROP_HASHCOL) && !find_prop(e->p, PROP_JOINIDX)) {
976 21000 : exp_swap(e);
977 : }
978 : }
979 : }
980 142363 : bool needed = false;
981 442368 : for(node *n = exps->h; !needed && n; n = n->next) {
982 593890 : for (node *m = n->next; !needed && m; m = m->next) {
983 293885 : if (exp_match_exp_semantics(n->data, m->data, true))
984 89 : needed = true;
985 : }
986 : }
987 142363 : if (needed) {
988 89 : list *nexps = sa_list(sql->sa);
989 :
990 293 : for(node *n = exps->h; n; n = n->next) {
991 204 : bool done = false;
992 629 : for (node *m = exps->h; m && !done; m = m->next) {
993 425 : if (n != m && exp_match_exp_semantics(n->data, m->data, false)) {
994 179 : sql_exp *e1 = n->data, *e2 = m->data;
995 179 : if ((is_any(e1) || is_semantics(e1)) || (!is_any(e2) && !is_semantics(e2))) {
996 179 : append(nexps, e1);
997 179 : if ((!is_any(e2) && !is_semantics(e2)) && is_left(rel->op) && list_length(rel->attr) == 1) {
998 : /* nil is false */
999 0 : sql_exp *m = rel->attr->h->data;
1000 0 : if (exp_is_atom(m))
1001 0 : set_no_nil(m);
1002 : }
1003 : }
1004 : done = true;
1005 : }
1006 : }
1007 204 : if (!done)
1008 25 : append(nexps, n->data);
1009 : }
1010 : return nexps;
1011 : }
1012 : (void)changes;
1013 : return exps;
1014 : }
1015 :
1016 : static inline sql_rel *
1017 1037252 : rel_select_cse(visitor *v, sql_rel *rel)
1018 : {
1019 1037252 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps) /* cleanup equal expressions */
1020 1037252 : rel->exps = cleanup_equal_exps(v->sql, rel, rel->exps, &v->changes); /* (a = b) and (a += b) */
1021 :
1022 1037252 : if (is_select(rel->op) && rel->exps)
1023 522176 : rel->exps = merge_ors(v->sql, rel->exps, &v->changes);
1024 :
1025 1037251 : if (is_select(rel->op) && rel->exps)
1026 522175 : rel->exps = merge_notequal(v->sql, rel->exps, &v->changes); /* x <> 1 and x <> 2 => x not in (1, 2)*/
1027 :
1028 1037251 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps)
1029 1037253 : rel->exps = merge_cmp_or_null(v->sql, rel, rel->exps, &v->changes); /* (a = b) or (a is null and b is null) -> a = b with null semantics */
1030 :
1031 1037250 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps) {
1032 1037252 : node *n;
1033 1037252 : list *nexps;
1034 1037252 : int needed = 0;
1035 :
1036 2224470 : for (n=rel->exps->h; n && !needed; n = n->next) {
1037 1187218 : sql_exp *e = n->data;
1038 :
1039 1187218 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e))
1040 1187218 : needed = 1;
1041 : }
1042 1037252 : if (!needed)
1043 : return rel;
1044 21523 : nexps = new_exp_list(v->sql->sa);
1045 50992 : for (n=rel->exps->h; n; n = n->next) {
1046 29469 : sql_exp *e = n->data;
1047 :
1048 29469 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e)) {
1049 : /* split the common expressions */
1050 22332 : v->changes += exps_cse(v->sql, nexps, e->l, e->r);
1051 : } else {
1052 7137 : append(nexps, e);
1053 : }
1054 : }
1055 21523 : rel->exps = nexps;
1056 : }
1057 : return rel;
1058 : }
1059 :
1060 : static list *
1061 13611 : exps_merge_select_rse( mvc *sql, list *l, list *r, bool *merged)
1062 : {
1063 13611 : node *n, *m, *o;
1064 13611 : list *nexps = NULL, *lexps, *rexps;
1065 13611 : bool lmerged = true, rmerged = true;
1066 :
1067 13611 : lexps = new_exp_list(sql->sa);
1068 28599 : for (n = l->h; n; n = n->next) {
1069 14988 : sql_exp *e = n->data;
1070 :
1071 14988 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e) && !is_semantics(e)) {
1072 5242 : lmerged = false;
1073 5242 : list *nexps = exps_merge_select_rse(sql, e->l, e->r, &lmerged);
1074 5644 : for (o = nexps->h; o; o = o->next)
1075 402 : append(lexps, o->data);
1076 : } else {
1077 9746 : append(lexps, e);
1078 : }
1079 : }
1080 13611 : if (lmerged)
1081 8418 : lmerged = (list_length(lexps) == 1);
1082 13611 : rexps = new_exp_list(sql->sa);
1083 29618 : for (n = r->h; n; n = n->next) {
1084 16007 : sql_exp *e = n->data;
1085 :
1086 16007 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e) && !is_semantics(e)) {
1087 699 : rmerged = false;
1088 699 : list *nexps = exps_merge_select_rse(sql, e->l, e->r, &rmerged);
1089 724 : for (o = nexps->h; o; o = o->next)
1090 25 : append(rexps, o->data);
1091 : } else {
1092 15308 : append(rexps, e);
1093 : }
1094 : }
1095 13611 : if (rmerged)
1096 12933 : rmerged = (list_length(r) == 1);
1097 :
1098 13611 : nexps = new_exp_list(sql->sa);
1099 :
1100 : /* merge merged lists first ? */
1101 23759 : for (n = lexps->h; n; n = n->next) {
1102 10148 : sql_exp *le = n->data, *re, *fnd = NULL;
1103 :
1104 10148 : if (le->type != e_cmp || le->flag == cmp_or || is_anti(le) || is_semantics(le) || is_symmetric(le))
1105 622 : continue;
1106 19647 : for (m = rexps->h; !fnd && m; m = m->next) {
1107 10121 : re = m->data;
1108 10121 : if (exps_match_col_exps(le, re))
1109 1551 : fnd = re;
1110 : }
1111 9526 : if (fnd && (is_anti(fnd) || is_semantics(fnd)))
1112 50 : continue;
1113 : /* cases
1114 : * 1) 2 values (cmp_equal)
1115 : * 2) 1 value (cmp_equal), and cmp_in
1116 : * (also cmp_in, cmp_equal)
1117 : * 3) 2 cmp_in
1118 : * 4) ranges
1119 : */
1120 1501 : if (fnd) {
1121 1501 : re = fnd;
1122 1501 : fnd = NULL;
1123 1501 : if (is_anti(le) || is_anti(re) || is_symmetric(re))
1124 0 : continue;
1125 1938 : if (le->flag == cmp_equal && re->flag == cmp_equal) {
1126 437 : list *exps = new_exp_list(sql->sa);
1127 :
1128 437 : append(exps, le->r);
1129 437 : append(exps, re->r);
1130 437 : fnd = exp_in(sql->sa, le->l, exps, cmp_in);
1131 1207 : } else if (le->flag == cmp_equal && re->flag == cmp_in){
1132 143 : list *exps = new_exp_list(sql->sa);
1133 :
1134 143 : append(exps, le->r);
1135 143 : list_merge(exps, re->r, NULL);
1136 143 : fnd = exp_in(sql->sa, le->l, exps, cmp_in);
1137 1216 : } else if (le->flag == cmp_in && re->flag == cmp_equal){
1138 295 : list *exps = new_exp_list(sql->sa);
1139 :
1140 295 : append(exps, re->r);
1141 295 : list_merge(exps, le->r, NULL);
1142 295 : fnd = exp_in(sql->sa, le->l, exps, cmp_in);
1143 741 : } else if (le->flag == cmp_in && re->flag == cmp_in){
1144 115 : list *exps = new_exp_list(sql->sa);
1145 :
1146 115 : list_merge(exps, le->r, NULL);
1147 115 : list_merge(exps, re->r, NULL);
1148 115 : fnd = exp_in(sql->sa, le->l, exps, cmp_in);
1149 511 : } else if (le->f && re->f && /* merge ranges */
1150 20 : le->flag == re->flag && le->flag <= cmp_lt) {
1151 20 : sql_exp *mine = NULL, *maxe = NULL;
1152 :
1153 20 : if (!(mine = rel_binop_(sql, NULL, exp_copy(sql, le->r), exp_copy(sql, re->r), "sys", "sql_min", card_value, true))) {
1154 0 : sql->session->status = 0;
1155 0 : sql->errstr[0] = '\0';
1156 0 : continue;
1157 : }
1158 20 : if (!(maxe = rel_binop_(sql, NULL, exp_copy(sql, le->f), exp_copy(sql, re->f), "sys", "sql_max", card_value, true))) {
1159 0 : sql->session->status = 0;
1160 0 : sql->errstr[0] = '\0';
1161 0 : continue;
1162 : }
1163 20 : fnd = exp_compare2(sql->sa, exp_copy(sql, le->l), mine, maxe, le->flag, 0);
1164 20 : lmerged = false;
1165 : }
1166 1010 : if (fnd) {
1167 1010 : append(nexps, fnd);
1168 1864 : *merged = (fnd && lmerged && rmerged);
1169 : }
1170 : }
1171 : }
1172 13611 : return nexps;
1173 : }
1174 :
1175 : /* merge related sub expressions
1176 : *
1177 : * ie (x = a and y > 1 and y < 5) or
1178 : * (x = c and y > 1 and y < 10) or
1179 : * (x = e and y > 1 and y < 20)
1180 : * ->
1181 : * ((x = a and y > 1 and y < 5) or
1182 : * (x = c and y > 1 and y < 10) or
1183 : * (x = e and y > 1 and y < 20)) and
1184 : * x in (a,c,e) and
1185 : * y > 1 and y < 20
1186 : *
1187 : * for single expression or's we can do better
1188 : * x in (a, b, c) or x in (d, e, f)
1189 : * ->
1190 : * x in (a, b, c, d, e, f)
1191 : * */
1192 : static inline sql_rel *
1193 398268 : rel_merge_select_rse(visitor *v, sql_rel *rel)
1194 : {
1195 : /* only execute once per select */
1196 398268 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps && !is_rel_merge_select_rse_used(rel->used)) {
1197 142622 : node *n, *o;
1198 142622 : list *nexps = new_exp_list(v->sql->sa);
1199 :
1200 304984 : for (n=rel->exps->h; n; n = n->next) {
1201 162363 : sql_exp *e = n->data;
1202 :
1203 170033 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e) && !is_semantics(e)) {
1204 : /* possibly merge related expressions */
1205 7670 : bool merged = false;
1206 :
1207 7670 : list *ps = exps_merge_select_rse(v->sql, e->l, e->r, &merged);
1208 8253 : for (o = ps->h; o; o = o->next)
1209 583 : append(nexps, o->data);
1210 7670 : if (merged)
1211 87 : v->changes++;
1212 : else
1213 7583 : append(nexps, e);
1214 : } else {
1215 154693 : append(nexps, e);
1216 : }
1217 : }
1218 142621 : rel->exps = nexps;
1219 142621 : rel->used |= rel_merge_select_rse_used;
1220 : }
1221 398267 : return rel;
1222 : }
1223 :
1224 : /* pack optimizers into a single function call to avoid iterations in the AST */
1225 : static sql_rel *
1226 3667075 : rel_optimize_select_and_joins_bottomup_(visitor *v, sql_rel *rel)
1227 : {
1228 3667075 : if (!rel || (!is_join(rel->op) && !is_semi(rel->op) && !is_select(rel->op)) || list_empty(rel->exps))
1229 2629822 : return rel;
1230 1037253 : uint8_t cycle = *(uint8_t*) v->data;
1231 :
1232 1037253 : rel->exps = exp_merge_range(v, rel, rel->exps);
1233 1037252 : rel = rel_select_cse(v, rel);
1234 1037252 : if (cycle == 1)
1235 398268 : rel = rel_merge_select_rse(v, rel);
1236 1037251 : rel = rewrite_simplify(v, cycle, v->value_based_opt, rel);
1237 1037251 : return rel;
1238 : }
1239 :
1240 : static sql_rel *
1241 129190 : rel_optimize_select_and_joins_bottomup(visitor *v, global_props *gp, sql_rel *rel)
1242 : {
1243 129190 : v->data = &gp->opt_cycle;
1244 129190 : rel = rel_visitor_bottomup(v, rel, &rel_optimize_select_and_joins_bottomup_);
1245 129190 : v->data = gp;
1246 129190 : return rel;
1247 : }
1248 :
1249 : run_optimizer
1250 629538 : bind_optimize_select_and_joins_bottomup(visitor *v, global_props *gp)
1251 : {
1252 629538 : int flag = v->sql->sql_optimizer;
1253 629346 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right] ||
1254 543607 : gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti] ||
1255 1258884 : gp->cnt[op_select]) && (flag & optimize_select_and_joins_bottomup) ? rel_optimize_select_and_joins_bottomup : NULL;
1256 : }
1257 :
1258 :
1259 : static inline sql_rel *
1260 3463659 : rel_push_join_exps_down(visitor *v, sql_rel *rel)
1261 : {
1262 : /* push select exps part of join expressions down */
1263 : /* TODO CHECK WHY not semi enabled */
1264 3463659 : if ((is_innerjoin(rel->op) || is_left(rel->op) || is_right(rel->op) /*|| is_semi(rel->op)*/) && !list_empty(rel->exps)) {
1265 486959 : int left = is_innerjoin(rel->op) || is_right(rel->op) || rel->op == op_semi;
1266 486959 : int right = is_innerjoin(rel->op) || is_left(rel->op) || is_semi(rel->op);
1267 486959 : sql_rel *jl = rel->l, *ojl = jl, *jr = rel->r, *ojr = jr;
1268 :
1269 486959 : set_processed(jl);
1270 486959 : set_processed(jr);
1271 1047245 : for (node *n = rel->exps->h; n;) {
1272 560286 : node *next = n->next;
1273 560286 : sql_exp *e = n->data;
1274 :
1275 560286 : if (left && rel_rebind_exp(v->sql, jl, e) && !is_any(e)) { /* select expressions on left */
1276 1330 : if (!is_select(jl->op) || rel_is_ref(jl))
1277 1319 : rel->l = jl = rel_select(v->sql->sa, jl, NULL);
1278 1330 : rel_select_add_exp(v->sql->sa, jl, e);
1279 1330 : list_remove_node(rel->exps, NULL, n);
1280 1330 : v->changes++;
1281 558956 : } else if (right && rel_rebind_exp(v->sql, jr, e) && !is_any(e)) { /* select expressions on right */
1282 43 : if (!is_select(jr->op) || rel_is_ref(jr))
1283 40 : rel->r = jr = rel_select(v->sql->sa, jr, NULL);
1284 43 : rel_select_add_exp(v->sql->sa, jr, e);
1285 43 : list_remove_node(rel->exps, NULL, n);
1286 43 : v->changes++;
1287 : }
1288 : n = next;
1289 : }
1290 486959 : if (ojl != jl)
1291 1319 : set_processed(jl);
1292 486959 : if (ojr != jr)
1293 40 : set_processed(jr);
1294 : }
1295 3463659 : return rel;
1296 : }
1297 :
1298 : static inline bool
1299 3463659 : is_non_trivial_select_applied_to_outer_join(sql_rel *rel)
1300 : {
1301 3463659 : return is_select(rel->op) && rel->exps && is_outerjoin(((sql_rel*) rel->l)->op);
1302 : }
1303 :
1304 : extern list *list_append_before(list *l, node *n, void *data);
1305 :
1306 : static void
1307 : replace_column_references_with_nulls_2(mvc *sql, sql_rel *inner_join_side, sql_exp* e);
1308 :
1309 : static void
1310 5831 : replace_column_references_with_nulls_1(mvc *sql, sql_rel *inner_join_side, list* exps) {
1311 5831 : if (list_empty(exps))
1312 : return;
1313 14865 : for(node* n = exps->h; n; n=n->next) {
1314 9034 : sql_exp* e = n->data;
1315 9034 : replace_column_references_with_nulls_2(sql, inner_join_side, e);
1316 : }
1317 : }
1318 :
1319 : static void
1320 28796 : replace_column_references_with_nulls_2(mvc *sql, sql_rel *inner_join_side, sql_exp* e) {
1321 36670 : if (e == NULL) {
1322 : return;
1323 : }
1324 :
1325 30398 : switch (e->type) {
1326 9134 : case e_column:
1327 9134 : if (rel_find_exp_and_corresponding_rel(inner_join_side, e, true, NULL, NULL)) {
1328 2559 : e->type = e_atom;
1329 2559 : e->l = atom_general(sql->sa, &e->tpe, NULL, 0);
1330 2559 : e->r = e->f = NULL;
1331 : }
1332 : break;
1333 9415 : case e_cmp:
1334 9415 : switch (e->flag) {
1335 6702 : case cmp_gt:
1336 : case cmp_gte:
1337 : case cmp_lte:
1338 : case cmp_lt:
1339 : case cmp_equal:
1340 : case cmp_notequal:
1341 : {
1342 6702 : sql_exp* l = e->l;
1343 6702 : sql_exp* r = e->r;
1344 6702 : sql_exp* f = e->f;
1345 :
1346 6702 : replace_column_references_with_nulls_2(sql, inner_join_side, l);
1347 6702 : replace_column_references_with_nulls_2(sql, inner_join_side, r);
1348 6702 : replace_column_references_with_nulls_2(sql, inner_join_side, f);
1349 6702 : break;
1350 : }
1351 1953 : case cmp_filter:
1352 : case cmp_or:
1353 : {
1354 1953 : list* l = e->l;
1355 1953 : list* r = e->r;
1356 1953 : replace_column_references_with_nulls_1(sql, inner_join_side, l);
1357 1953 : replace_column_references_with_nulls_1(sql, inner_join_side, r);
1358 1953 : break;
1359 : }
1360 760 : case cmp_in:
1361 : case cmp_notin:
1362 : {
1363 760 : sql_exp* l = e->l;
1364 760 : list* r = e->r;
1365 760 : replace_column_references_with_nulls_2(sql, inner_join_side, l);
1366 760 : replace_column_references_with_nulls_1(sql, inner_join_side, r);
1367 760 : break;
1368 : }
1369 : default:
1370 : break;
1371 : }
1372 : break;
1373 1165 : case e_func:
1374 : {
1375 1165 : list* l = e->l;
1376 1165 : replace_column_references_with_nulls_1(sql, inner_join_side, l);
1377 1165 : break;
1378 : }
1379 1172 : case e_convert:
1380 : {
1381 1172 : sql_exp* l = e->l;
1382 1172 : replace_column_references_with_nulls_2(sql, inner_join_side, l);
1383 1172 : break;
1384 : }
1385 : default:
1386 : break;
1387 : }
1388 : }
1389 :
1390 : static sql_rel *
1391 4962 : out2inner(visitor *v, sql_rel* sel, sql_rel* join, sql_rel* inner_join_side, operator_type new_type) {
1392 :
1393 : /* handle inner_join relations with a simple select */
1394 4962 : if (is_select(inner_join_side->op) && inner_join_side->l)
1395 4962 : inner_join_side = inner_join_side->l;
1396 :
1397 4962 : list* select_predicates = exps_copy(v->sql, sel->exps);
1398 :
1399 10466 : for(node* n = select_predicates->h; n; n=n->next) {
1400 5598 : sql_exp* e = n->data;
1401 5598 : replace_column_references_with_nulls_2(v->sql, inner_join_side, e);
1402 :
1403 5598 : if (exp_is_false(e)) {
1404 94 : join->op = new_type;
1405 94 : v->changes++;
1406 94 : break;
1407 : }
1408 : }
1409 :
1410 4962 : return sel;
1411 : }
1412 :
1413 : static inline sql_rel *
1414 3463659 : rel_out2inner(visitor *v, sql_rel *rel) {
1415 :
1416 3463659 : if (!is_non_trivial_select_applied_to_outer_join(rel)) {
1417 : // Nothing to do here.
1418 : return rel;
1419 : }
1420 :
1421 4940 : sql_rel* join = (sql_rel*) rel->l;
1422 :
1423 4940 : if (rel_is_ref(join)) {
1424 : /* Do not alter a multi-referenced join relation.
1425 : * This is problematic (e.g. in the case of the plan of a merge statement)
1426 : * basically because there are no guarantees on the other container relations.
1427 : * In particular there is no guarantee that the other referencing relations are
1428 : * select relations with null-rejacting predicates on the inner join side.
1429 : */
1430 : return rel;
1431 : }
1432 :
1433 4940 : sql_rel* inner_join_side;
1434 4940 : if (is_left(join->op)) {
1435 4892 : inner_join_side = join->r;
1436 4892 : return out2inner(v, rel, join, inner_join_side, op_join);
1437 : }
1438 48 : else if (is_right(join->op)) {
1439 26 : inner_join_side = join->l;
1440 26 : return out2inner(v, rel, join, inner_join_side, op_join);
1441 : }
1442 : else /*full outer join*/ {
1443 : // First check if left side can degenerate from full outer join to just right outer join.
1444 22 : inner_join_side = join->r;
1445 22 : rel = out2inner(v, rel, join, inner_join_side, op_right);
1446 : /* Now test if the right side can degenerate to
1447 : * a normal inner join or a left outer join
1448 : * depending on the result of previous call to out2inner.
1449 : */
1450 :
1451 22 : inner_join_side = join->l;
1452 35 : return out2inner(v, rel, join, inner_join_side, is_right(join->op)? op_join: op_left);
1453 : }
1454 : }
1455 :
1456 : static bool
1457 4279 : exps_uses_any(list *exps, list *l)
1458 : {
1459 4279 : bool uses_any = false;
1460 :
1461 4279 : if (list_empty(exps) || list_empty(l))
1462 14 : return false;
1463 8536 : for (node *n = l->h; n && !uses_any; n = n->next) {
1464 4271 : sql_exp *e = n->data;
1465 4271 : uses_any |= list_exps_uses_exp(exps, exp_relname(e), exp_name(e)) != NULL;
1466 : }
1467 :
1468 : return uses_any;
1469 : }
1470 :
1471 : /* TODO At the moment I have to disable the new join2semi because the join order optimizer doesn't take semi-joins into account,
1472 : so plans get deteriorated if more joins are optimized into semi-joins. Later I will review the join order with semi-joins and hopefully,
1473 : I will be able to re-enable the new join2semi. */
1474 : #if 0
1475 : #define NO_EXP_FOUND 0
1476 : #define FOUND_WITH_DUPLICATES 1
1477 : #define MAY_HAVE_DUPLICATE_NULLS 2
1478 : #define ALL_VALUES_DISTINCT 3
1479 :
1480 : static int
1481 : find_projection_for_join2semi(sql_rel *rel, sql_exp *jc)
1482 : {
1483 : sql_rel *res = NULL;
1484 : sql_exp *e = NULL;
1485 : bool underjoin = false;
1486 :
1487 : if ((e = rel_find_exp_and_corresponding_rel(rel, jc, &res, &underjoin))) {
1488 : if (underjoin || e->type != e_column)
1489 : return FOUND_WITH_DUPLICATES;
1490 : /* if just one groupby column is projected or the relation needs distinct values and one column is projected or is a primary key, it will be distinct */
1491 : if (is_unique(e) ||
1492 : (is_groupby(res->op) && list_length(res->r) == 1 && exps_find_exp(res->r, e)) ||
1493 : ((is_project(res->op) || is_base(res->op)) && ((need_distinct(res) && list_length(res->exps) == 1) || res->card < CARD_AGGR)))
1494 : return has_nil(e) ? MAY_HAVE_DUPLICATE_NULLS : ALL_VALUES_DISTINCT;
1495 : return FOUND_WITH_DUPLICATES;
1496 : }
1497 : return NO_EXP_FOUND;
1498 : }
1499 :
1500 : static int
1501 : subrel_uses_exp_outside_subrel(visitor *v, sql_rel *rel, list *l, sql_rel *j)
1502 : {
1503 : if (rel == j)
1504 : return 0;
1505 : if (mvc_highwater(v->sql))
1506 : return 1;
1507 : switch(rel->op){
1508 : case op_join:
1509 : case op_left:
1510 : case op_right:
1511 : case op_full:
1512 : return exps_uses_any(rel->exps, l) ||
1513 : subrel_uses_exp_outside_subrel(v, rel->l, l, j) || subrel_uses_exp_outside_subrel(v, rel->r, l, j);
1514 : case op_semi:
1515 : case op_anti:
1516 : case op_select:
1517 : return exps_uses_any(rel->exps, l) ||
1518 : subrel_uses_exp_outside_subrel(v, rel->l, l, j);
1519 : case op_project:
1520 : case op_groupby:
1521 : return exps_uses_any(rel->exps, l) || exps_uses_any(rel->r, l);
1522 : case op_basetable:
1523 : case op_table:
1524 : case op_union:
1525 : case op_except:
1526 : case op_inter:
1527 : return exps_uses_any(rel->exps, l);
1528 : case op_topn:
1529 : case op_sample:
1530 : return subrel_uses_exp_outside_subrel(v, rel->l, l, j);
1531 : default:
1532 : return 1;
1533 : }
1534 : }
1535 :
1536 : static int
1537 : projrel_uses_exp_outside_subrel(visitor *v, sql_rel *rel, list *l, sql_rel *j)
1538 : {
1539 : /* test if projecting relation uses any of the join expressions */
1540 : assert((is_simple_project(rel->op) || is_groupby(rel->op)) && rel->l);
1541 : return exps_uses_any(rel->exps, l) || exps_uses_any(rel->r, l) || subrel_uses_exp_outside_subrel(v, rel->l, l, j);
1542 : }
1543 :
1544 : static sql_rel *
1545 : rewrite_joins2semi(visitor *v, sql_rel *proj, sql_rel *rel)
1546 : {
1547 : /* generalize possibility : we need the visitor 'step' here */
1548 : if (rel_is_ref(rel) || mvc_highwater(v->sql)) /* if the join has multiple references, it's dangerous to convert it into a semijoin */
1549 : return rel;
1550 : if (is_innerjoin(rel->op) && !list_empty(rel->exps)) {
1551 : sql_rel *l = rel->l, *r = rel->r;
1552 : bool left_unique = true, right_unique = true;
1553 :
1554 : /* these relations don't project anything, so skip them */
1555 : while (is_topn(l->op) || is_sample(l->op) || is_select(l->op) || is_semi(l->op))
1556 : l = l->l;
1557 : /* joins will expand values, so don't search on those */
1558 : if (!is_base(l->op) && !is_project(l->op))
1559 : left_unique = false;
1560 : while (is_topn(r->op) || is_sample(r->op) || is_select(r->op) || is_semi(r->op))
1561 : r = r->l;
1562 : if (!is_base(r->op) && !is_project(r->op))
1563 : right_unique = false;
1564 : /* if all columns used in equi-joins from one of the sides are unique, the join can be rewritten into a semijoin */
1565 : for (node *n=rel->exps->h; n && (left_unique || right_unique); n = n->next) {
1566 : sql_exp *e = n->data, *el = e->l, *er = e->r;
1567 :
1568 : if (!is_compare(e->type) || e->flag != cmp_equal || exp_has_func(el) || exp_has_func(er)) {
1569 : left_unique = right_unique = false;
1570 : } else {
1571 : int found = 0;
1572 :
1573 : if (left_unique && (found = find_projection_for_join2semi(l, el)) > NO_EXP_FOUND)
1574 : left_unique &= (found == ALL_VALUES_DISTINCT || (found == MAY_HAVE_DUPLICATE_NULLS && (!is_semantics(e) || !has_nil(er))));
1575 : if (left_unique && (found = find_projection_for_join2semi(l, er)) > NO_EXP_FOUND)
1576 : left_unique &= (found == ALL_VALUES_DISTINCT || (found == MAY_HAVE_DUPLICATE_NULLS && (!is_semantics(e) || !has_nil(el))));
1577 : if (right_unique && (found = find_projection_for_join2semi(r, el)) > NO_EXP_FOUND)
1578 : right_unique &= (found == ALL_VALUES_DISTINCT || (found == MAY_HAVE_DUPLICATE_NULLS && (!is_semantics(e) || !has_nil(er))));
1579 : if (right_unique && (found = find_projection_for_join2semi(r, er)) > NO_EXP_FOUND)
1580 : right_unique &= (found == ALL_VALUES_DISTINCT || (found == MAY_HAVE_DUPLICATE_NULLS && (!is_semantics(e) || !has_nil(el))));
1581 : }
1582 : }
1583 :
1584 : /* now we need to check relation's expressions are not used */
1585 : if (left_unique && !projrel_uses_exp_outside_subrel(v, proj, l->exps, rel)) {
1586 : sql_rel *tmp = rel->r;
1587 : rel->r = rel->l;
1588 : rel->l = tmp;
1589 : rel->op = op_semi;
1590 : v->changes++;
1591 : } else if (right_unique && !projrel_uses_exp_outside_subrel(v, proj, r->exps, rel)) {
1592 : rel->op = op_semi;
1593 : v->changes++;
1594 : }
1595 : }
1596 : if (is_join(rel->op)) {
1597 : rel->l = rewrite_joins2semi(v, proj, rel->l);
1598 : rel->r = rewrite_joins2semi(v, proj, rel->r);
1599 : } else if (is_topn(rel->op) || is_sample(rel->op) || is_select(rel->op) || is_semi(rel->op)) {
1600 : rel->l = rewrite_joins2semi(v, proj, rel->l);
1601 : }
1602 : return rel;
1603 : }
1604 :
1605 : static inline sql_rel *
1606 : rel_join2semijoin(visitor *v, sql_rel *rel)
1607 : {
1608 : if ((is_simple_project(rel->op) || is_groupby(rel->op)) && rel->l)
1609 : rel->l = rewrite_joins2semi(v, rel, rel->l);
1610 : return rel;
1611 : }
1612 : #endif
1613 :
1614 : #define NO_PROJECTION_FOUND 0
1615 : #define MAY_HAVE_DUPLICATE_NULLS 1
1616 : #define ALL_VALUES_DISTINCT 2
1617 :
1618 : static int
1619 713498 : find_projection_for_join2semi(sql_rel *rel)
1620 : {
1621 713498 : if (is_simple_project(rel->op) || is_groupby(rel->op) || is_inter(rel->op) || is_except(rel->op) || is_base(rel->op) || (is_union(rel->op) && need_distinct(rel))) {
1622 379166 : if (rel->card < CARD_AGGR) /* const or groupby without group by exps */
1623 : return ALL_VALUES_DISTINCT;
1624 378006 : if (list_length(rel->exps) == 1) {
1625 6752 : sql_exp *e = rel->exps->h->data;
1626 : /* a single group by column in the projection list from a group by relation is guaranteed to be unique, but not an aggregate */
1627 6752 : if (e->type == e_column) {
1628 6722 : sql_rel *res = NULL;
1629 6722 : sql_exp *found = NULL;
1630 6722 : bool underjoin = false;
1631 :
1632 : /* if just one groupby column is projected or the relation needs distinct values and one column is projected or is a primary key, it will be distinct */
1633 6722 : if ((is_groupby(rel->op) && list_length(rel->r) == 1 && exps_find_exp(rel->r, e)) || (need_distinct(rel) && list_length(rel->exps) == 1))
1634 9607 : return ALL_VALUES_DISTINCT;
1635 3048 : if (is_unique(e))
1636 2258 : return has_nil(e) ? MAY_HAVE_DUPLICATE_NULLS : ALL_VALUES_DISTINCT;
1637 :
1638 790 : if ((is_simple_project(rel->op) || is_groupby(rel->op) || is_inter(rel->op) || is_except(rel->op)) &&
1639 146 : (found = rel_find_exp_and_corresponding_rel(rel->l, e, false, &res, &underjoin)) && !underjoin) { /* grouping column on inner relation */
1640 130 : if (need_distinct(res) && list_length(res->exps) == 1)
1641 : return ALL_VALUES_DISTINCT;
1642 130 : if (is_unique(found))
1643 0 : return has_nil(e) ? MAY_HAVE_DUPLICATE_NULLS : ALL_VALUES_DISTINCT;
1644 130 : if (found->type == e_column && found->card <= CARD_AGGR) {
1645 1 : if (!is_groupby(res->op) && list_length(res->exps) != 1)
1646 : return NO_PROJECTION_FOUND;
1647 0 : for (node *n = res->exps->h ; n ; n = n->next) { /* must be the single column in the group by expression list */
1648 0 : sql_exp *e = n->data;
1649 0 : if (e != found && e->type == e_column)
1650 : return NO_PROJECTION_FOUND;
1651 : }
1652 : return ALL_VALUES_DISTINCT;
1653 : }
1654 : }
1655 : }
1656 : }
1657 : }
1658 : return NO_PROJECTION_FOUND;
1659 : }
1660 :
1661 : static sql_rel *
1662 2269225 : find_candidate_join2semi(visitor *v, sql_rel *rel, bool *swap)
1663 : {
1664 : /* generalize possibility : we need the visitor 'step' here */
1665 2269783 : if (rel_is_ref(rel)) /* if the join has multiple references, it's dangerous to convert it into a semijoin */
1666 : return NULL;
1667 2152959 : if (rel->op == op_join && !list_empty(rel->exps) && list_empty(rel->attr)) {
1668 358933 : sql_rel *l = rel->l, *r = rel->r;
1669 358933 : int foundr = NO_PROJECTION_FOUND, foundl = NO_PROJECTION_FOUND, found = NO_PROJECTION_FOUND;
1670 358933 : bool ok = false;
1671 :
1672 358933 : foundr = find_projection_for_join2semi(r);
1673 358933 : if (foundr < ALL_VALUES_DISTINCT)
1674 354565 : foundl = find_projection_for_join2semi(l);
1675 358933 : if (foundr && foundr > foundl) {
1676 4378 : *swap = false;
1677 4378 : found = foundr;
1678 354555 : } else if (foundl) {
1679 2707 : *swap = true;
1680 2707 : found = foundl;
1681 : }
1682 :
1683 7085 : if (found > NO_PROJECTION_FOUND) {
1684 : /* if all join expressions can be pushed down or have function calls, then it cannot be rewritten into a semijoin */
1685 14174 : for (node *n=rel->exps->h; n && !ok; n = n->next) {
1686 7089 : sql_exp *e = n->data;
1687 :
1688 10863 : ok |= e->type == e_cmp && e->flag == cmp_equal && !exp_has_func(e) && !rel_rebind_exp(v->sql, l, e) && !rel_rebind_exp(v->sql, r, e) &&
1689 11 : (found == ALL_VALUES_DISTINCT || !is_semantics(e) || !has_nil((sql_exp *)e->l) || !has_nil((sql_exp *)e->r));
1690 : }
1691 : }
1692 :
1693 358933 : if (ok)
1694 : return rel;
1695 : }
1696 2149633 : if (is_join(rel->op) || is_semi(rel->op)) {
1697 539887 : sql_rel *c;
1698 :
1699 539887 : if ((c=find_candidate_join2semi(v, rel->l, swap)) != NULL ||
1700 539488 : (c=find_candidate_join2semi(v, rel->r, swap)) != NULL)
1701 421 : if (list_empty(c->attr))
1702 : return c;
1703 : }
1704 2149212 : if (is_topn(rel->op) || is_sample(rel->op))
1705 558 : return find_candidate_join2semi(v, rel->l, swap);
1706 : return NULL;
1707 : }
1708 :
1709 : static int
1710 2541 : subrel_uses_exp_outside_subrel(sql_rel *rel, list *l, sql_rel *c)
1711 : {
1712 2542 : if (rel == c)
1713 : return 0;
1714 : /* for subrel only expect joins (later possibly selects) */
1715 843 : if (is_join(rel->op) || is_semi(rel->op)) {
1716 427 : if (exps_uses_any(rel->exps, l))
1717 : return 1;
1718 836 : if (subrel_uses_exp_outside_subrel(rel->l, l, c) ||
1719 417 : subrel_uses_exp_outside_subrel(rel->r, l, c))
1720 5 : return 1;
1721 : }
1722 830 : if (is_topn(rel->op) || is_sample(rel->op))
1723 1 : return subrel_uses_exp_outside_subrel(rel->l, l, c);
1724 : return 0;
1725 : }
1726 :
1727 : static int
1728 3326 : rel_uses_exp_outside_subrel(sql_rel *rel, list *l, sql_rel *c)
1729 : {
1730 : /* for now we only expect sub relations of type project, selects (rel) or join/semi */
1731 3326 : if (is_simple_project(rel->op) || is_groupby(rel->op) || is_select(rel->op)) {
1732 3326 : if (!list_empty(rel->exps) && exps_uses_any(rel->exps, l))
1733 : return 1;
1734 1705 : if ((is_simple_project(rel->op) || is_groupby(rel->op)) && !list_empty(rel->r) && exps_uses_any(rel->r, l))
1735 : return 1;
1736 1705 : if (rel->l)
1737 1705 : return subrel_uses_exp_outside_subrel(rel->l, l, c);
1738 : }
1739 0 : if (is_topn(rel->op) || is_sample(rel->op))
1740 0 : return subrel_uses_exp_outside_subrel(rel->l, l, c);
1741 : return 1;
1742 : }
1743 :
1744 : static inline sql_rel *
1745 3463659 : rel_join2semijoin(visitor *v, sql_rel *rel)
1746 : {
1747 3463659 : if ((is_simple_project(rel->op) || is_groupby(rel->op)) && rel->l) {
1748 1189850 : bool swap = false;
1749 1189850 : sql_rel *l = rel->l;
1750 1189850 : sql_rel *c = find_candidate_join2semi(v, l, &swap);
1751 :
1752 1189850 : if (c) {
1753 : /* 'p' is a project */
1754 3326 : sql_rel *p = swap ? c->l : c->r;
1755 :
1756 : /* now we need to check if ce is only used at the level of c */
1757 3326 : if (!rel_uses_exp_outside_subrel(rel, p->exps, c)) {
1758 1697 : c->op = op_semi;
1759 1697 : if (swap) {
1760 520 : sql_rel *tmp = c->r;
1761 520 : c->r = c->l;
1762 520 : c->l = tmp;
1763 : }
1764 1697 : v->changes++;
1765 : }
1766 : }
1767 : }
1768 3463659 : return rel;
1769 : }
1770 :
1771 : static inline sql_rel *
1772 3463659 : rel_push_join_down_outer(visitor *v, sql_rel *rel)
1773 : {
1774 3463659 : if (is_join(rel->op) && !is_outerjoin(rel->op) && !is_single(rel) && !list_empty(rel->exps) && !rel_is_ref(rel)) {
1775 369233 : sql_rel *l = rel->l, *r = rel->r;
1776 :
1777 369233 : if (is_left(r->op) && (is_select(l->op) || (is_join(l->op) && !is_outerjoin(l->op))) && !rel_is_ref(l) &&
1778 648 : !rel_is_ref(r)) {
1779 648 : sql_rel *rl = r->l;
1780 648 : sql_rel *rr = r->r;
1781 648 : if (rel_is_ref(rl) || rel_is_ref(rr))
1782 : return rel;
1783 : /* join exps should only include l and r.l */
1784 648 : list *njexps = sa_list(v->sql->sa);
1785 1304 : for(node *n = rel->exps->h; n; n = n->next) {
1786 656 : sql_exp *je = n->data;
1787 :
1788 656 : assert(je->type == e_cmp);
1789 656 : if (je->f)
1790 : return rel;
1791 656 : if ((rel_find_exp(l, je->l) && rel_find_exp(rl, je->r)) || (rel_find_exp(l, je->r) && rel_find_exp(rl, je->l))) {
1792 656 : list_append(njexps, je);
1793 : } else {
1794 0 : return rel;
1795 : }
1796 : }
1797 648 : sql_rel *nl = rel_crossproduct(v->sql->sa, rel_dup(l), rl, rel->op);
1798 648 : r->l = nl;
1799 648 : nl->exps = njexps;
1800 648 : nl->attr = rel->attr;
1801 648 : rel->attr = NULL;
1802 648 : set_processed(nl);
1803 648 : rel_dup(r);
1804 648 : rel_destroy(rel);
1805 648 : rel = r;
1806 648 : v->changes++;
1807 : }
1808 : }
1809 : return rel;
1810 : }
1811 :
1812 : static sql_rel *
1813 3463659 : rel_optimize_joins_(visitor *v, sql_rel *rel)
1814 : {
1815 3463659 : rel = rel_push_join_exps_down(v, rel);
1816 3463659 : rel = rel_out2inner(v, rel);
1817 3463659 : rel = rel_join2semijoin(v, rel);
1818 3463659 : rel = rel_push_join_down_outer(v, rel);
1819 3463659 : return rel;
1820 : }
1821 :
1822 : static sql_rel *
1823 91276 : rel_optimize_joins(visitor *v, global_props *gp, sql_rel *rel)
1824 : {
1825 91276 : (void) gp;
1826 91276 : return rel_visitor_topdown(v, rel, &rel_optimize_joins_);
1827 : }
1828 :
1829 : run_optimizer
1830 629569 : bind_optimize_joins(visitor *v, global_props *gp)
1831 : {
1832 629569 : int flag = v->sql->sql_optimizer;
1833 629389 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
1834 1258958 : || gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti]) && (flag & optimize_joins) ? rel_optimize_joins : NULL;
1835 : }
1836 :
1837 :
1838 : static sql_rel *rel_join_order_(visitor *v, sql_rel *rel);
1839 :
1840 : static void
1841 711051 : get_relations(visitor *v, sql_rel *rel, list *rels)
1842 : {
1843 988988 : if (list_empty(rel->attr) && !rel_is_ref(rel) && rel->op == op_join && rel->exps == NULL) {
1844 277937 : sql_rel *l = rel->l;
1845 277937 : sql_rel *r = rel->r;
1846 :
1847 277937 : get_relations(v, l, rels);
1848 277937 : get_relations(v, r, rels);
1849 277937 : rel->l = NULL;
1850 277937 : rel->r = NULL;
1851 277937 : rel_destroy(rel);
1852 : } else {
1853 433114 : rel = rel_join_order_(v, rel);
1854 433114 : append(rels, rel);
1855 : }
1856 711051 : }
1857 :
1858 : static void
1859 184905 : get_inner_relations(mvc *sql, sql_rel *rel, list *rels)
1860 : {
1861 292502 : if (!rel_is_ref(rel) && is_join(rel->op)) {
1862 107597 : sql_rel *l = rel->l;
1863 107597 : sql_rel *r = rel->r;
1864 :
1865 107597 : get_inner_relations(sql, l, rels);
1866 107597 : get_inner_relations(sql, r, rels);
1867 : } else {
1868 184905 : append(rels, rel);
1869 : }
1870 184905 : }
1871 :
1872 : static int
1873 1071437 : exp_count(int *cnt, sql_exp *e)
1874 : {
1875 1071437 : int flag;
1876 1071437 : if (!e)
1877 : return 0;
1878 1071437 : if (find_prop(e->p, PROP_JOINIDX))
1879 3541 : *cnt += 100;
1880 1071437 : if (find_prop(e->p, PROP_HASHCOL))
1881 34379 : *cnt += 100;
1882 1071437 : if (find_prop(e->p, PROP_HASHIDX))
1883 0 : *cnt += 100;
1884 1071437 : switch(e->type) {
1885 395405 : case e_cmp:
1886 395405 : if (!is_complex_exp(e->flag)) {
1887 336487 : exp_count(cnt, e->l);
1888 336487 : exp_count(cnt, e->r);
1889 336487 : if (e->f)
1890 3052 : exp_count(cnt, e->f);
1891 : }
1892 395405 : flag = e->flag;
1893 395405 : switch (flag) {
1894 312504 : case cmp_equal:
1895 312504 : *cnt += 90;
1896 312504 : return 90;
1897 17478 : case cmp_notequal:
1898 17478 : *cnt += 7;
1899 17478 : return 7;
1900 6505 : case cmp_gt:
1901 : case cmp_gte:
1902 : case cmp_lt:
1903 : case cmp_lte:
1904 6505 : *cnt += 6;
1905 6505 : if (e->l) {
1906 6505 : sql_exp *l = e->l;
1907 6505 : sql_subtype *t = exp_subtype(l);
1908 6505 : if (EC_TEMP(t->type->eclass)) /* give preference to temporal ranges */
1909 172 : *cnt += 90;
1910 : }
1911 6505 : if (e->f){ /* range */
1912 3052 : *cnt += 6;
1913 3052 : return 12;
1914 : }
1915 : return 6;
1916 1042 : case cmp_filter:
1917 1042 : if (exps_card(e->r) > CARD_AGGR) {
1918 : /* filters for joins are special */
1919 3 : *cnt += 1000;
1920 3 : return 1000;
1921 : }
1922 1039 : *cnt += 2;
1923 1039 : return 2;
1924 53124 : case cmp_in:
1925 : case cmp_notin: {
1926 53124 : list *l = e->r;
1927 53124 : int c = 9 - 10*list_length(l);
1928 53124 : *cnt += c;
1929 53124 : return c;
1930 : }
1931 4752 : case cmp_or: /* prefer or over functions */
1932 4752 : *cnt += 3;
1933 4752 : return 3;
1934 : default:
1935 : return 0;
1936 : }
1937 533253 : case e_column:
1938 533253 : *cnt += 20;
1939 533253 : return 20;
1940 123930 : case e_atom:
1941 123930 : *cnt += 10;
1942 123930 : return 10;
1943 2862 : case e_func:
1944 : /* functions are more expensive, depending on the number of columns involved. */
1945 2862 : if (e->card == CARD_ATOM)
1946 : return 0;
1947 2571 : *cnt -= 5*list_length(e->l);
1948 2571 : return 5*list_length(e->l);
1949 15987 : case e_convert:
1950 : /* functions are more expensive, depending on the number of columns involved. */
1951 15987 : if (e->card == CARD_ATOM)
1952 : return 0;
1953 : /* fall through */
1954 : default:
1955 15323 : *cnt -= 5;
1956 15323 : return -5;
1957 : }
1958 : }
1959 :
1960 : int
1961 269636 : exp_keyvalue(sql_exp *e)
1962 : {
1963 269636 : int cnt = 0;
1964 60407 : exp_count(&cnt, e);
1965 269636 : return cnt;
1966 : }
1967 :
1968 : static sql_exp *
1969 746790 : joinexp_col(sql_exp *e, sql_rel *r)
1970 : {
1971 746790 : if (e->type == e_cmp) {
1972 746790 : if (rel_has_exp(r, e->l, false) >= 0)
1973 399255 : return e->l;
1974 347535 : return e->r;
1975 : }
1976 0 : assert(0);
1977 : return NULL;
1978 : }
1979 :
1980 : static sql_column *
1981 494136 : table_colexp(sql_exp *e, sql_rel *r)
1982 : {
1983 494136 : sql_table *t = r->l;
1984 :
1985 494136 : if (e->type == e_column) {
1986 479690 : const char *name = exp_name(e);
1987 479690 : node *cn;
1988 :
1989 479690 : if (r->exps) { /* use alias */
1990 887603 : for (cn = r->exps->h; cn; cn = cn->next) {
1991 883291 : sql_exp *ce = cn->data;
1992 883291 : if (strcmp(exp_name(ce), name) == 0) {
1993 475378 : name = ce->r;
1994 475378 : break;
1995 : }
1996 : }
1997 : }
1998 1056607 : for (cn = ol_first_node(t->columns); cn; cn = cn->next) {
1999 1052295 : sql_column *c = cn->data;
2000 1052295 : if (strcmp(c->base.name, name) == 0)
2001 475378 : return c;
2002 : }
2003 : }
2004 : return NULL;
2005 : }
2006 :
2007 : static list *
2008 359622 : matching_joins(allocator *sa, list *rels, list *exps, sql_exp *je)
2009 : {
2010 359622 : sql_rel *l, *r;
2011 :
2012 359622 : assert (je->type == e_cmp);
2013 :
2014 359622 : l = find_rel(rels, je->l);
2015 359622 : r = find_rel(rels, je->r);
2016 359622 : if (l && r) {
2017 359481 : list *res;
2018 359481 : list *n_rels = sa_list(sa);
2019 :
2020 359481 : append(n_rels, l);
2021 359481 : append(n_rels, r);
2022 359481 : res = list_select(exps, n_rels, (fcmp) &exp_joins_rels, (fdup)NULL);
2023 359481 : return res;
2024 : }
2025 141 : return sa_list(sa);
2026 : }
2027 :
2028 : static int
2029 6373 : sql_column_kc_cmp(sql_column *c, sql_kc *kc)
2030 : {
2031 : /* return on equality */
2032 6373 : return (c->colnr - kc->c->colnr);
2033 : }
2034 :
2035 : static sql_idx *
2036 463781 : find_fk_index(mvc *sql, sql_table *l, list *lcols, sql_table *r, list *rcols)
2037 : {
2038 463781 : sql_trans *tr = sql->session->tr;
2039 :
2040 463781 : if (l->idxs) {
2041 463781 : node *in;
2042 551408 : for (in = ol_first_node(l->idxs); in; in = in->next){
2043 88467 : sql_idx *li = in->data;
2044 88467 : if (li->type == join_idx) {
2045 8717 : sql_key *rk = (sql_key*)os_find_id(tr->cat->objects, tr, ((sql_fkey*)li->key)->rkey);
2046 8717 : fcmp cmp = (fcmp)&sql_column_kc_cmp;
2047 :
2048 9666 : if (rk->t == r &&
2049 1789 : list_match(lcols, li->columns, cmp) == 0 &&
2050 840 : list_match(rcols, rk->columns, cmp) == 0) {
2051 840 : return li;
2052 : }
2053 : }
2054 : }
2055 : }
2056 : return NULL;
2057 : }
2058 :
2059 : static sql_rel *
2060 719244 : find_basetable( sql_rel *r)
2061 : {
2062 1062509 : if (!r)
2063 : return NULL;
2064 1054845 : switch(r->op) {
2065 579182 : case op_basetable:
2066 579182 : if (!r->l)
2067 0 : return NULL;
2068 : return r;
2069 343265 : case op_semi:
2070 : case op_anti:
2071 : case op_project:
2072 : case op_select:
2073 : case op_topn:
2074 : case op_sample:
2075 343265 : return find_basetable(r->l);
2076 : default:
2077 : return NULL;
2078 : }
2079 : }
2080 :
2081 : static int
2082 99913 : exps_count(list *exps)
2083 : {
2084 99913 : node *n;
2085 99913 : int cnt = 0;
2086 :
2087 99913 : if (!exps)
2088 : return 0;
2089 225688 : for (n = exps->h; n; n=n->next)
2090 125775 : exp_count(&cnt, n->data);
2091 99913 : return cnt;
2092 : }
2093 :
2094 : static list *
2095 255586 : order_join_expressions(mvc *sql, list *dje, list *rels)
2096 : {
2097 255586 : node *n;
2098 255586 : int cnt = list_length(dje);
2099 :
2100 255586 : if (cnt <= 1)
2101 : return dje;
2102 :
2103 66399 : list *res = sa_list(sql->sa);
2104 66399 : int i, *keys = SA_NEW_ARRAY(sql->ta, int, cnt);
2105 66399 : void **data = SA_NEW_ARRAY(sql->ta, void*, cnt);
2106 :
2107 275628 : for (n = dje->h, i = 0; n; n = n->next, i++) {
2108 209229 : sql_exp *e = n->data;
2109 :
2110 209229 : keys[i] = exp_keyvalue(e);
2111 : /* add some weight for the selections */
2112 209229 : if (e->type == e_cmp && !is_complex_exp(e->flag)) {
2113 209205 : sql_rel *l = find_rel(rels, e->l);
2114 209205 : sql_rel *r = find_rel(rels, e->r);
2115 :
2116 209205 : if (l && is_select(l->op) && l->exps)
2117 53482 : keys[i] += list_length(l->exps)*10 + exps_count(l->exps);
2118 209205 : if (r && is_select(r->op) && r->exps)
2119 46431 : keys[i] += list_length(r->exps)*10 + exps_count(r->exps);
2120 : }
2121 209229 : data[i] = n->data;
2122 : }
2123 : /* sort descending */
2124 66399 : GDKqsort(keys, data, NULL, cnt, sizeof(int), sizeof(void *), TYPE_int, true, true);
2125 342027 : for(i=0; i<cnt; i++) {
2126 209229 : list_append(res, data[i]);
2127 : }
2128 : return res;
2129 : }
2130 :
2131 : static int
2132 239087 : find_join_rels(list **L, list **R, list *exps, list *rels)
2133 : {
2134 239087 : node *n;
2135 :
2136 239087 : *L = sa_list(exps->sa);
2137 239087 : *R = sa_list(exps->sa);
2138 239087 : if (!exps || list_length(exps) <= 1)
2139 : return -1;
2140 292340 : for(n = exps->h; n; n = n->next) {
2141 220778 : sql_exp *e = n->data;
2142 220778 : sql_rel *l = NULL, *r = NULL;
2143 :
2144 220778 : if (!is_complex_exp(e->flag)){
2145 220773 : l = find_rel(rels, e->l);
2146 220773 : r = find_rel(rels, e->r);
2147 : }
2148 220773 : if (l<r) {
2149 142077 : list_append(*L, l);
2150 142077 : list_append(*R, r);
2151 : } else {
2152 78701 : list_append(*L, r);
2153 78701 : list_append(*R, l);
2154 : }
2155 : }
2156 : return 0;
2157 : }
2158 :
2159 : static list *
2160 71562 : distinct_join_exps(list *aje, list *lrels, list *rrels)
2161 : {
2162 71562 : node *n, *m, *o, *p;
2163 71562 : int len = list_length(aje), i, j;
2164 71562 : char *used = SA_ZNEW_ARRAY(aje->sa, char, len);
2165 71562 : list *res = sa_list(aje->sa);
2166 :
2167 71562 : assert(len == list_length(lrels));
2168 292340 : for(n = lrels->h, m = rrels->h, j = 0; n && m;
2169 220778 : n = n->next, m = m->next, j++) {
2170 220778 : if (n->data && m->data)
2171 953762 : for(o = n->next, p = m->next, i = j+1; o && p;
2172 733034 : o = o->next, p = p->next, i++) {
2173 733034 : if (o->data == n->data && p->data == m->data)
2174 29946 : used[i] = 1;
2175 : }
2176 : }
2177 292340 : for (i = 0, n = aje->h; i < len; n = n->next, i++) {
2178 220778 : if (!used[i])
2179 195960 : list_append(res, n->data);
2180 : }
2181 71562 : return res;
2182 : }
2183 :
2184 : static list *
2185 239087 : find_fk( mvc *sql, list *rels, list *exps)
2186 : {
2187 239087 : node *djn;
2188 239087 : list *sdje, *aje, *dje;
2189 239087 : list *lrels, *rrels;
2190 :
2191 : /* first find the distinct join expressions */
2192 239087 : aje = list_select(exps, rels, (fcmp) &exp_is_join, (fdup)NULL);
2193 : /* add left/right relation */
2194 239087 : if (find_join_rels(&lrels, &rrels, aje, rels) < 0)
2195 : dje = aje;
2196 : else
2197 71562 : dje = distinct_join_exps(aje, lrels, rrels);
2198 602209 : for(djn=dje->h; djn; djn = djn->next) {
2199 : /* equal join expressions */
2200 363202 : sql_idx *idx = NULL;
2201 363202 : sql_exp *je = djn->data, *le = je->l, *re = je->r;
2202 :
2203 363202 : if (is_complex_exp(je->flag))
2204 : break;
2205 363122 : if (!find_prop(je->p, PROP_JOINIDX)) {
2206 359622 : int swapped = 0;
2207 359622 : list *aaje = matching_joins(sql->sa, rels, aje, je);
2208 359622 : list *eje = list_select(aaje, (void*)1, (fcmp) &exp_is_eqjoin, (fdup)NULL);
2209 359622 : sql_rel *lr = find_rel(rels, le), *olr = lr;
2210 359622 : sql_rel *rr = find_rel(rels, re), *orr = rr;
2211 359622 : sql_rel *bt = NULL;
2212 359622 : char *iname;
2213 :
2214 359622 : sql_table *l, *r;
2215 359622 : list *lexps = list_map(eje, lr, (fmap) &joinexp_col);
2216 359622 : list *rexps = list_map(eje, rr, (fmap) &joinexp_col);
2217 359622 : list *lcols, *rcols;
2218 :
2219 359622 : lr = find_basetable(lr);
2220 359622 : rr = find_basetable(rr);
2221 359622 : if (!lr || !rr)
2222 236295 : continue;
2223 250726 : l = lr->l;
2224 250726 : r = rr->l;
2225 250726 : lcols = list_map(lexps, lr, (fmap) &table_colexp);
2226 250726 : rcols = list_map(rexps, rr, (fmap) &table_colexp);
2227 250726 : lcols->destroy = NULL;
2228 250726 : rcols->destroy = NULL;
2229 250726 : if (list_length(lcols) != list_length(rcols))
2230 18502 : continue;
2231 :
2232 232224 : idx = find_fk_index(sql, l, lcols, r, rcols);
2233 232224 : if (!idx) {
2234 231557 : idx = find_fk_index(sql, r, rcols, l, lcols);
2235 231557 : swapped = 1;
2236 : }
2237 :
2238 232224 : if (idx && (iname = sa_strconcat( sql->sa, "%", idx->base.name)) != NULL &&
2239 667 : ((!swapped && name_find_column(olr, NULL, iname, -2, &bt) == NULL) ||
2240 173 : ( swapped && name_find_column(orr, NULL, iname, -2, &bt) == NULL)))
2241 : idx = NULL;
2242 :
2243 : if (idx) {
2244 751 : prop *p;
2245 751 : node *n;
2246 751 : sql_exp *t = NULL, *i = NULL;
2247 :
2248 751 : if (list_length(lcols) > 1 || !mvc_debug_on(sql, 512)) {
2249 :
2250 : /* Add join between idx and TID */
2251 751 : if (swapped) {
2252 155 : sql_exp *s = je->l, *l = je->r;
2253 :
2254 155 : t = rel_find_column(sql, olr, s->l, TID);
2255 155 : i = rel_find_column(sql, orr, l->l, iname);
2256 155 : if (!t || !i)
2257 1 : continue;
2258 154 : t->p = NULL;
2259 154 : i->p = NULL;
2260 154 : je = exp_compare(sql->sa, i, t, cmp_equal);
2261 : } else {
2262 596 : sql_exp *s = je->r, *l = je->l;
2263 :
2264 596 : t = rel_find_column(sql, orr, s->l, TID);
2265 596 : i = rel_find_column(sql, olr, l->l, iname);
2266 596 : if (!t || !i)
2267 0 : continue;
2268 596 : t->p = NULL;
2269 596 : i->p = NULL;
2270 596 : je = exp_compare(sql->sa, i, t, cmp_equal);
2271 : }
2272 :
2273 : /* Remove all join expressions */
2274 1502 : for (n = eje->h; n; n = n->next)
2275 752 : list_remove_data(exps, NULL, n->data);
2276 750 : append(exps, je);
2277 750 : djn->data = je;
2278 0 : } else if (swapped) { /* else keep je for single column expressions */
2279 0 : je = exp_compare(sql->sa, je->r, je->l, cmp_equal);
2280 : /* Remove all join expressions */
2281 0 : for (n = eje->h; n; n = n->next)
2282 0 : list_remove_data(exps, NULL, n->data);
2283 0 : append(exps, je);
2284 0 : djn->data = je;
2285 : }
2286 750 : je->p = p = prop_create(sql->sa, PROP_JOINIDX, je->p);
2287 750 : p->value.pval = idx;
2288 : }
2289 : }
2290 : }
2291 :
2292 : /* sort expressions on weighted number of reducing operators */
2293 239087 : sdje = order_join_expressions(sql, dje, rels);
2294 239087 : return sdje;
2295 : }
2296 :
2297 : static int
2298 557623 : rels_find_one_rel( sql_rel **rels, int nr, sql_exp *e)
2299 : {
2300 557623 : int fnd = 0;
2301 :
2302 4449265 : for(int i = 1; i<=nr; i++) {
2303 3891705 : if (rel_has_exp(rels[i], e, false) == 0) {
2304 557421 : if (fnd)
2305 : return 0;
2306 : fnd = i;
2307 : }
2308 : }
2309 : return fnd;
2310 : }
2311 :
2312 : /* TODO move popcount and popcount64 into gdk_*.h, used in gdk_cand, strimps and here */
2313 : static inline int
2314 : popcount64(uint64_t x)
2315 : {
2316 : #ifdef __has_builtin
2317 : #if __has_builtin(__builtin_popcountll)
2318 : return (uint32_t) __builtin_popcountll(x);
2319 : #define BUILTIN_USED
2320 : #endif
2321 : #endif
2322 : #ifndef BUILTIN_USED
2323 : #if defined(_MSC_VER)
2324 : #if SIZEOF_OID == 4
2325 : /* no __popcnt64 on 32 bit Windows */
2326 : return (int) (__popcnt((uint32_t) x) + __popcnt((uint32_t) (x >> 32)));
2327 : #else
2328 : return (uint32_t) __popcnt64(x);
2329 : #endif
2330 : #else
2331 : x = (x & UINT64_C(0x5555555555555555)) + ((x >> 1) & UINT64_C(0x5555555555555555));
2332 : x = (x & UINT64_C(0x3333333333333333)) + ((x >> 2) & UINT64_C(0x3333333333333333));
2333 : x = (x & UINT64_C(0x0F0F0F0F0F0F0F0F)) + ((x >> 4) & UINT64_C(0x0F0F0F0F0F0F0F0F));
2334 : return (x * UINT64_C(0x0101010101010101)) >> 56;
2335 : #endif
2336 : #endif
2337 : #undef BUILTIN_USED
2338 : }
2339 :
2340 : static sql_rel *
2341 155177 : order_joins(visitor *v, list *rels, list *exps)
2342 : {
2343 155177 : sql_rel *top = NULL, *l = NULL, *r = NULL;
2344 155177 : sql_exp *cje;
2345 155177 : node *djn;
2346 155177 : list *sdje, *n_rels = NULL;
2347 155177 : int fnd = 0;
2348 155177 : unsigned int rsingle;
2349 155177 : int direct = 1;
2350 :
2351 : /* find foreign keys and reorder the expressions on reducing quality */
2352 155177 : sdje = find_fk(v->sql, rels, exps);
2353 :
2354 433890 : for(djn = sdje->h; djn; djn = djn->next ) {
2355 278713 : sql_exp *e = djn->data;
2356 278713 : list_remove_data(exps, NULL, e);
2357 : }
2358 155177 : if (list_length(rels) > 2 && mvc_debug_on(v->sql, 256)) {
2359 0 : top = rel_planner(v->sql, rels, sdje, exps);
2360 0 : return top;
2361 : }
2362 :
2363 155177 : int nr_exps = list_length(sdje), nr_rels = list_length(rels), ci = 1;
2364 155177 : if (nr_rels > 64) {
2365 1 : direct = 0;
2366 1 : n_rels = sa_list(v->sql->ta);
2367 : }
2368 155177 : sql_rel **rels_a = SA_NEW_ARRAY(v->sql->ta, sql_rel*, nr_rels+1); /* don't use slot 0 */
2369 155177 : rels_a[0] = NULL;
2370 588291 : for (node *n = rels->h; n; n = n->next, ci++) {
2371 433114 : rels_a[ci] = n->data;
2372 : }
2373 155177 : ulng *h = SA_NEW_ARRAY(v->sql->ta, ulng, nr_exps), rel_mask = 0; /* bit field (for > 64 its an imprint) */
2374 155177 : uint16_t *r1 = SA_NEW_ARRAY(v->sql->ta, uint16_t, nr_exps);
2375 155177 : uint16_t *r2 = SA_NEW_ARRAY(v->sql->ta, uint16_t, nr_exps);
2376 : /* change r3 into rest list's */
2377 155177 : int *r3 = SA_NEW_ARRAY(v->sql->ta, int, nr_exps);
2378 :
2379 155177 : ci = 0;
2380 433890 : for (node *n = sdje->h; n; n = n->next, ci++) {
2381 278713 : sql_exp *cje = n->data;
2382 :
2383 278713 : h[ci] = r1[ci] = r2[ci] = 0;
2384 278713 : r3[ci] = 0;
2385 : /* h[ci] = exp_find_rels(cje, rels) */
2386 278713 : if (cje->type != e_cmp || !is_complex_exp(cje->flag) || !find_prop(cje->p, PROP_HASHCOL) ||
2387 0 : (cje->type == e_cmp && cje->f == NULL)) {
2388 278713 : cje->tmp = ci;
2389 278713 : r1[ci] = rels_find_one_rel(rels_a, nr_rels, cje->l);
2390 278713 : r2[ci] = rels_find_one_rel(rels_a, nr_rels, cje->r);
2391 278713 : if (r1[ci])
2392 278595 : h[ci] |= ((ulng)1)<<((r1[ci]-1)%64);
2393 278713 : if (r2[ci])
2394 278576 : h[ci] |= ((ulng)1)<<((r2[ci]-1)%64);
2395 278713 : if (cje->f) {
2396 197 : r3[ci] = rels_find_one_rel(rels_a, nr_rels, cje->f);
2397 197 : if (r3[ci] == r2[ci])
2398 177 : r3[ci] = 0;
2399 197 : if (r3[ci])
2400 10 : h[ci] |= ((ulng)1)<<((r3[ci]-1)%64);
2401 : }
2402 : }
2403 : }
2404 : /* open problem, some expressions use more than 2 relations */
2405 : /* For example a.x = b.y * c.z; */
2406 155177 : if (list_length(rels) >= 2 && sdje->h) {
2407 310312 : for (node *n = sdje->h; n && !l && !r; n = n->next, ci++) {
2408 155160 : cje = n->data;
2409 :
2410 : /* find the involved relations */
2411 :
2412 : /* complex expressions may touch multiple base tables
2413 : * Should be pushed up to extra selection.
2414 : * */
2415 155160 : if (0 && popcount64(h[cje->tmp]) > 2)
2416 : assert(0);
2417 155160 : if (cje->type != e_cmp || !is_complex_exp(cje->flag) || !find_prop(cje->p, PROP_HASHCOL) ||
2418 0 : (cje->type == e_cmp && cje->f == NULL)) {
2419 155160 : l = rels_a[r1[cje->tmp]];
2420 155160 : r = rels_a[r2[cje->tmp]];
2421 155160 : if (l && r)
2422 155041 : rel_mask |= h[cje->tmp];
2423 : }
2424 : }
2425 155152 : cje->tmp = 0;
2426 :
2427 155152 : if (l && r && l != r)
2428 155041 : list_remove_data(sdje, NULL, cje);
2429 : }
2430 :
2431 155177 : if (l && r && l != r) {
2432 155041 : list_remove_data(rels, NULL, l);
2433 155041 : list_remove_data(rels, NULL, r);
2434 155041 : if (!direct) {
2435 1 : list_append(n_rels, l);
2436 1 : list_append(n_rels, r);
2437 : }
2438 :
2439 : /* Create a relation between l and r. Since the calling
2440 : functions rewrote the join tree, into a list of expressions
2441 : and a list of (simple) relations, there are no outer joins
2442 : involved, we can simply do a crossproduct here.
2443 : */
2444 155041 : rsingle = is_single(r);
2445 155041 : reset_single(r);
2446 155041 : top = rel_crossproduct(v->sql->sa, l, r, op_join);
2447 155041 : if (rsingle)
2448 5108 : set_single(r);
2449 155041 : rel_join_add_exp(v->sql->sa, top, cje);
2450 :
2451 : /* all other join expressions on these 2 relations */
2452 158844 : for (node *en = exps->h; en; ) {
2453 3803 : node *next = en->next;
2454 3803 : sql_exp *e = en->data;
2455 3803 : if (rel_rebind_exp(v->sql, top, e)) {
2456 3631 : rel_join_add_exp(v->sql->sa, top, e);
2457 3631 : list_remove_data(exps, NULL, e);
2458 : }
2459 : en = next;
2460 : }
2461 : fnd = 1;
2462 : }
2463 : /* build join tree using the ordered list */
2464 275415 : while(list_length(sdje) && fnd) {
2465 120238 : fnd = 0;
2466 : /* find the first expression which could be added */
2467 880152 : for(djn = sdje->h; djn && !fnd && rels->h; djn = (!fnd)?djn->next:NULL) {
2468 379957 : node *en;
2469 379957 : l = r = NULL;
2470 :
2471 379957 : cje = djn->data;
2472 379957 : if ((h[cje->tmp] & rel_mask) > 0) {
2473 120156 : if (rel_mask & (((ulng)1)<<((r1[cje->tmp]-1)%64)))
2474 67739 : l = rels_a[r1[cje->tmp]];
2475 120156 : if (rel_mask & (((ulng)1)<<((r2[cje->tmp]-1)%64)))
2476 52418 : r = rels_a[r2[cje->tmp]];
2477 : }
2478 379957 : if (!direct) { /* check if at least one side in n_rels */
2479 1040 : if (l && !list_find(n_rels, l, NULL))
2480 1007 : l = NULL;
2481 1040 : if (r && !list_find(n_rels, r, NULL))
2482 1 : r = NULL;
2483 : }
2484 :
2485 379957 : if (l && r) {
2486 0 : assert(0);
2487 : /* create a selection on the current */
2488 : rel_join_add_exp(v->sql->sa, top, cje);
2489 : fnd = 1;
2490 379957 : } else if (l || r) {
2491 : /* TODO: handle case for joins which need > 2 relations, ie where the current 'top' of the
2492 : * join tree needs to add more then one relation */
2493 120156 : rel_mask |= h[cje->tmp];
2494 120156 : if (l) {
2495 67739 : r = rels_a[r2[cje->tmp]];
2496 : } else {
2497 52417 : l = r;
2498 52417 : r = rels_a[r1[cje->tmp]];
2499 : }
2500 120156 : if (!r) {
2501 0 : fnd = 1; /* not really, but this bails out */
2502 0 : list_remove_data(sdje, NULL, cje); /* handle later as select */
2503 0 : continue;
2504 : }
2505 :
2506 : /* remove the expression from the lists */
2507 120156 : list_remove_data(sdje, NULL, cje);
2508 :
2509 120156 : list_remove_data(rels, NULL, r);
2510 120156 : if (!direct)
2511 63 : append(n_rels, r);
2512 :
2513 : /* create a join using the current expression */
2514 120156 : rsingle = is_single(r);
2515 120156 : reset_single(r);
2516 120156 : top = rel_crossproduct(v->sql->sa, top, r, op_join);
2517 120156 : if (rsingle)
2518 0 : set_single(r);
2519 120156 : rel_join_add_exp(v->sql->sa, top, cje);
2520 :
2521 : /* all join expressions on these tables */
2522 120545 : for (en = exps->h; en; ) {
2523 389 : node *next = en->next;
2524 389 : sql_exp *e = en->data;
2525 389 : if (rel_rebind_exp(v->sql, top, e)) {
2526 170 : rel_join_add_exp(v->sql->sa, top, e);
2527 170 : list_remove_data(exps, NULL, e);
2528 : }
2529 : en = next;
2530 : }
2531 : /* Remove other joins on the current 'n_rels'
2532 : set in the distinct list too */
2533 695623 : for (en = sdje->h; en; ) {
2534 575467 : node *next = en->next;
2535 575467 : sql_exp *e = en->data;
2536 575467 : if ((direct && ((e->flag <= cmp_notequal && (h[e->tmp] & rel_mask) == h[e->tmp] && h[e->tmp]) || (e->flag > cmp_notequal && rel_rebind_exp(v->sql, top, e)))) ||
2537 1953 : (!direct && rel_rebind_exp(v->sql, top, e))) {
2538 3318 : rel_join_add_exp(v->sql->sa, top, e);
2539 3318 : list_remove_data(sdje, NULL, en->data);
2540 : }
2541 : en = next;
2542 : }
2543 : fnd = 1;
2544 : }
2545 : }
2546 : }
2547 155177 : if (list_length(rels)) { /* more relations */
2548 1178 : node *n;
2549 4054 : for(n=rels->h; n; n = n->next) {
2550 2876 : sql_rel *nr = n->data;
2551 :
2552 2876 : if (top) {
2553 2740 : rsingle = is_single(nr);
2554 2740 : reset_single(nr);
2555 2740 : top = rel_crossproduct(v->sql->sa, top, nr, op_join);
2556 2740 : if (rsingle)
2557 0 : set_single(nr);
2558 : } else
2559 : top = nr;
2560 : }
2561 : }
2562 155177 : if (list_length(sdje)) {
2563 193 : if (list_empty(exps))
2564 : exps = sdje;
2565 : else
2566 0 : exps = list_merge(exps, sdje, (fdup)NULL);
2567 : }
2568 155177 : if (list_length(exps)) { /* more expressions (add selects) */
2569 220 : top = rel_select(v->sql->sa, top, NULL);
2570 445 : for(node *n=exps->h; n; n = n->next) {
2571 225 : sql_exp *e = n->data;
2572 :
2573 225 : if (exp_is_join_exp(e) == 0) {
2574 210 : sql_rel *nr = NULL;
2575 210 : if (is_theta_exp(e->flag)) {
2576 135 : nr = rel_push_join(v->sql, top->l, e->l, e->r, e->f, e, 0);
2577 75 : } else if (e->flag == cmp_filter || e->flag == cmp_or) {
2578 75 : sql_exp *l = exps_find_one_multi_exp(e->l), *r = exps_find_one_multi_exp(e->r);
2579 75 : if (l && r)
2580 69 : nr = rel_push_join(v->sql, top->l, l, r, NULL, e, 0);
2581 : }
2582 204 : if (!nr)
2583 6 : rel_join_add_exp(v->sql->sa, top->l, e);
2584 : } else
2585 15 : rel_select_add_exp(v->sql->sa, top, e);
2586 : }
2587 220 : if (list_empty(top->exps)) { /* empty select */
2588 205 : sql_rel *l = top->l;
2589 205 : top->l = NULL;
2590 205 : rel_destroy(top);
2591 205 : top = l;
2592 : }
2593 : }
2594 : return top;
2595 : }
2596 :
2597 : static int
2598 433114 : rel_neg_in_size(sql_rel *r)
2599 : {
2600 433114 : if ((is_union(r->op) /*|| is_munion(r->op)*/) && r->nrcols == 0)
2601 0 : return -1 + rel_neg_in_size(r->l);
2602 433114 : if (is_project(r->op) && r->nrcols == 0)
2603 0 : return -1;
2604 : return 0;
2605 : }
2606 :
2607 433114 : static void _rel_destroy(void *dummy, sql_rel *rel)
2608 : {
2609 433114 : (void)dummy;
2610 433114 : rel_destroy(rel);
2611 433114 : }
2612 :
2613 : static list *
2614 155177 : push_in_join_down(mvc *sql, list *rels, list *exps)
2615 : {
2616 155177 : node *n;
2617 155177 : int restart = 1;
2618 155177 : list *nrels;
2619 :
2620 : /* we should sort these first, ie small in's before large one's */
2621 155177 : nrels = list_sort(rels, (fkeyvalue)&rel_neg_in_size, (fdup)&rel_dup);
2622 :
2623 : /* we need to cleanup, the new refs ! */
2624 155177 : rels->destroy = (fdestroy)_rel_destroy;
2625 155177 : list_destroy(rels);
2626 155177 : rels = nrels;
2627 :
2628 : /* one of the rels should be a op_union with nrcols == 0 */
2629 465531 : while (restart) {
2630 588291 : for (n = rels->h; n; n = n->next) {
2631 433114 : sql_rel *r = n->data;
2632 :
2633 433114 : restart = 0;
2634 433114 : if (is_project(r->op) && r->nrcols == 0) {
2635 : /* next step find expression on this relation */
2636 0 : node *m;
2637 0 : sql_rel *l = NULL;
2638 0 : sql_exp *je = NULL;
2639 :
2640 0 : for(m = exps->h; !je && m; m = m->next) {
2641 0 : sql_exp *e = m->data;
2642 :
2643 0 : if (e->type == e_cmp && e->flag == cmp_equal) {
2644 : /* in values are on
2645 : the right of the join */
2646 0 : if (rel_has_exp(r, e->r, false) >= 0)
2647 0 : je = e;
2648 : }
2649 : }
2650 : /* with this expression find other relation */
2651 0 : if (je && (l = find_rel(rels, je->l)) != NULL) {
2652 0 : unsigned int rsingle = is_single(r);
2653 0 : reset_single(r);
2654 0 : sql_rel *nr = rel_crossproduct(sql->sa, l, r, op_join);
2655 0 : if (rsingle)
2656 0 : set_single(r);
2657 0 : rel_join_add_exp(sql->sa, nr, je);
2658 0 : list_append(rels, nr);
2659 0 : list_remove_data(rels, NULL, l);
2660 0 : list_remove_data(rels, NULL, r);
2661 0 : list_remove_data(exps, NULL, je);
2662 0 : restart = 1;
2663 0 : break;
2664 : }
2665 :
2666 : }
2667 : }
2668 : }
2669 155177 : return rels;
2670 : }
2671 :
2672 : static list *
2673 739646 : push_up_join_exps( mvc *sql, sql_rel *rel)
2674 : {
2675 739646 : if (rel_is_ref(rel))
2676 : return NULL;
2677 :
2678 698874 : switch(rel->op) {
2679 290224 : case op_join: {
2680 290224 : sql_rel *rl = rel->l;
2681 290224 : sql_rel *rr = rel->r;
2682 290224 : list *l, *r;
2683 :
2684 290224 : if (rel_is_ref(rl) && rel_is_ref(rr)) {
2685 16 : l = rel->exps;
2686 16 : rel->exps = NULL;
2687 16 : return l;
2688 : }
2689 290208 : l = push_up_join_exps(sql, rl);
2690 290208 : r = push_up_join_exps(sql, rr);
2691 290208 : if (l && r) {
2692 34 : l = list_merge(l, r, (fdup)NULL);
2693 34 : r = NULL;
2694 290174 : } else if (!l) {
2695 176637 : l = r;
2696 176637 : r = NULL;
2697 : }
2698 290208 : if (rel->exps) {
2699 258425 : if (l && !r)
2700 103190 : r = l;
2701 258425 : l = list_merge(rel->exps, r, (fdup)NULL);
2702 : }
2703 290208 : rel->exps = NULL;
2704 290208 : return l;
2705 : }
2706 : default:
2707 : return NULL;
2708 : }
2709 : }
2710 :
2711 : static sql_rel *
2712 286673 : reorder_join(visitor *v, sql_rel *rel)
2713 : {
2714 286673 : list *exps, *rels;
2715 :
2716 286673 : if (is_innerjoin(rel->op) && !is_single(rel) && !rel_is_ref(rel) && list_empty(rel->attr)) {
2717 176705 : if (list_empty(rel->exps)) {
2718 22334 : sql_rel *l = rel->l, *r = rel->r;
2719 22334 : if (!is_innerjoin(l->op) && !is_innerjoin(r->op))
2720 : return rel;
2721 : }
2722 159230 : rel->exps = push_up_join_exps(v->sql, rel);
2723 : }
2724 :
2725 269198 : if (!is_innerjoin(rel->op) || is_single(rel) || rel_is_ref(rel) || list_empty(rel->exps) || !list_empty(rel->attr)) {
2726 114021 : if (!list_empty(rel->exps)) { /* cannot add join idxs to cross products */
2727 77308 : exps = rel->exps;
2728 77308 : rel->exps = NULL; /* should be all crosstables by now */
2729 77308 : rels = sa_list(v->sql->ta);
2730 : /* try to use an join index also for outer joins */
2731 77308 : get_inner_relations(v->sql, rel, rels);
2732 77308 : int cnt = list_length(exps);
2733 77308 : rel->exps = find_fk(v->sql, rels, exps);
2734 77308 : if (list_length(rel->exps) != cnt)
2735 16499 : rel->exps = order_join_expressions(v->sql, exps, rels);
2736 : }
2737 114021 : rel->l = rel_join_order_(v, rel->l);
2738 114021 : rel->r = rel_join_order_(v, rel->r);
2739 : } else {
2740 155177 : exps = rel->exps;
2741 155177 : rel->exps = NULL; /* should be all crosstables by now */
2742 155177 : rels = sa_list(v->sql->ta);
2743 155177 : get_relations(v, rel, rels);
2744 155177 : if (list_length(rels) > 1) {
2745 155177 : rels = push_in_join_down(v->sql, rels, exps);
2746 155177 : rel = order_joins(v, rels, exps);
2747 : } else {
2748 0 : rel->exps = exps;
2749 : }
2750 : }
2751 : return rel;
2752 : }
2753 :
2754 : static sql_rel *
2755 2425357 : rel_join_order_(visitor *v, sql_rel *rel)
2756 : {
2757 2425357 : if (!rel)
2758 : return rel;
2759 :
2760 2409404 : switch (rel->op) {
2761 : case op_basetable:
2762 : break;
2763 3878 : case op_table:
2764 3878 : if (IS_TABLE_PROD_FUNC(rel->flag) || rel->flag == TABLE_FROM_RELATION)
2765 3878 : rel->l = rel_join_order_(v, rel->l);
2766 : break;
2767 : case op_join:
2768 : case op_left:
2769 : case op_right:
2770 : case op_full:
2771 : break;
2772 :
2773 12393 : case op_semi:
2774 : case op_anti:
2775 :
2776 : case op_union:
2777 : case op_inter:
2778 : case op_except:
2779 : case op_merge:
2780 12393 : rel->l = rel_join_order_(v, rel->l);
2781 12393 : rel->r = rel_join_order_(v, rel->r);
2782 12393 : break;
2783 118227 : case op_munion:
2784 118227 : assert(rel->l);
2785 475320 : for (node *n = ((list*)rel->l)->h; n; n = n->next)
2786 357093 : n->data = rel_join_order_(v, n->data);
2787 : break;
2788 1282306 : case op_project:
2789 : case op_select:
2790 : case op_groupby:
2791 : case op_topn:
2792 : case op_sample:
2793 1282306 : rel->l = rel_join_order_(v, rel->l);
2794 1282306 : break;
2795 52 : case op_ddl:
2796 52 : if (rel->flag == ddl_output || rel->flag == ddl_create_seq || rel->flag == ddl_alter_seq || rel->flag == ddl_alter_table || rel->flag == ddl_create_table || rel->flag == ddl_create_view) {
2797 0 : rel->l = rel_join_order_(v, rel->l);
2798 : } else if (rel->flag == ddl_list || rel->flag == ddl_exception) {
2799 52 : rel->l = rel_join_order_(v, rel->l);
2800 52 : rel->r = rel_join_order_(v, rel->r);
2801 : }
2802 : break;
2803 11879 : case op_insert:
2804 : case op_update:
2805 : case op_delete:
2806 11879 : rel->r = rel_join_order_(v, rel->r);
2807 11879 : break;
2808 : case op_truncate:
2809 : break;
2810 : }
2811 2409404 : if (is_join(rel->op))
2812 286673 : rel = reorder_join(v, rel);
2813 : return rel;
2814 : }
2815 :
2816 : static sql_rel *
2817 84155 : rel_join_order(visitor *v, global_props *gp, sql_rel *rel)
2818 : {
2819 84155 : (void) gp;
2820 84155 : sql_rel *r = rel_join_order_(v, rel);
2821 84155 : sa_reset(v->sql->ta);
2822 84155 : return r;
2823 : }
2824 :
2825 : run_optimizer
2826 629589 : bind_join_order(visitor *v, global_props *gp)
2827 : {
2828 629589 : int flag = v->sql->sql_optimizer;
2829 629393 : return gp->opt_level == 1 && gp->opt_cycle < 10 && !gp->cnt[op_update] && (gp->cnt[op_join] || gp->cnt[op_left] ||
2830 1252732 : gp->cnt[op_right] || gp->cnt[op_full]) && (flag & join_order) ? rel_join_order : NULL;
2831 : }
2832 :
2833 : /* this join order is to be done once after statistics are gathered */
2834 : run_optimizer
2835 721185 : bind_join_order2(visitor *v, global_props *gp)
2836 : {
2837 : /*int flag = v->sql->sql_optimizer;
2838 : return gp->opt_level == 1 && !gp->has_special_modify && !gp->cnt[op_update] && (gp->cnt[op_join] || gp->cnt[op_left] ||
2839 : gp->cnt[op_right] || gp->cnt[op_full]) && (flag & join_order) ? rel_join_order : NULL;*/
2840 : /* TODO we have to propagate count statistics here */
2841 721185 : (void) v;
2842 721185 : (void) gp;
2843 721185 : return NULL;
2844 : }
2845 :
2846 :
2847 : static int
2848 14674 : is_identity_of(sql_exp *e, sql_rel *l)
2849 : {
2850 14674 : if (e->type != e_cmp)
2851 : return 0;
2852 14647 : if (!is_identity(e->l, l) || !is_identity(e->r, l) || (e->f && !is_identity(e->f, l)))
2853 14647 : return 0;
2854 : return 1;
2855 : }
2856 :
2857 : static inline sql_rel *
2858 18911 : rel_rewrite_semijoin(visitor *v, sql_rel *rel)
2859 : {
2860 18911 : assert(is_semi(rel->op));
2861 : {
2862 18911 : sql_rel *l = rel->l;
2863 18911 : sql_rel *r = rel->r;
2864 18911 : sql_rel *rl = (r->l)?r->l:NULL;
2865 18911 : int on_identity = 1;
2866 :
2867 18911 : if (!rel->exps || list_length(rel->exps) != 1 || !is_identity_of(rel->exps->h->data, l))
2868 : on_identity = 0;
2869 :
2870 : /* rewrite {semi,anti}join (A, join(A,B)) into {semi,anti}join (A,B)
2871 : * and {semi,anti}join (A, join(B,A)) into {semi,anti}join (A,B)
2872 : * Where the semi/anti join is done using the identity */
2873 0 : if (on_identity && l->ref.refcnt == 2 && ((is_join(r->op) && (l == r->l || l == r->r)) ||
2874 0 : (is_project(r->op) && rl && is_join(rl->op) && (l == rl->l || l == rl->r)))){
2875 0 : sql_rel *or = r;
2876 :
2877 0 : if (is_project(r->op))
2878 0 : r = rl;
2879 :
2880 0 : if (l == r->r)
2881 0 : rel->r = rel_dup(r->l);
2882 : else
2883 0 : rel->r = rel_dup(r->r);
2884 :
2885 0 : rel->exps = r->exps;
2886 0 : r->exps = NULL;
2887 0 : rel->attr = r->attr;
2888 0 : r->attr = NULL;
2889 0 : rel_destroy(or);
2890 0 : v->changes++;
2891 : }
2892 : }
2893 : {
2894 18911 : sql_rel *l = rel->l, *rl = NULL;
2895 18911 : sql_rel *r = rel->r, *or = r;
2896 :
2897 18911 : if (r)
2898 18911 : rl = r->l;
2899 18911 : if (r && is_project(r->op)) {
2900 15778 : r = rl;
2901 15778 : if (r)
2902 15534 : rl = r->l;
2903 : }
2904 :
2905 : /* More general case is (join reduction)
2906 : {semi,anti}join (A, join(A,B) [A.c1 == B.c1]) [ A.c1 == B.c1 ]
2907 : into {semi,anti}join (A,B) [ A.c1 == B.c1 ]
2908 :
2909 : for semijoin also A.c1 == B.k1 ] [ A.c1 == B.k2 ] could be rewritten
2910 : */
2911 18911 : if (l && r && rl &&
2912 17527 : is_basetable(l->op) && is_basetable(rl->op) &&
2913 4033 : is_join(r->op) && l->l == rl->l)
2914 : {
2915 26 : node *n, *m;
2916 26 : list *exps;
2917 :
2918 51 : if (!rel->exps || !r->exps ||
2919 25 : list_length(rel->exps) != list_length(r->exps))
2920 1 : return rel;
2921 25 : exps = new_exp_list(v->sql->sa);
2922 :
2923 : /* are the join conditions equal */
2924 25 : for (n = rel->exps->h, m = r->exps->h;
2925 25 : n && m; n = n->next, m = m->next)
2926 : {
2927 25 : sql_exp *le = NULL, *oe = n->data;
2928 25 : sql_exp *re = NULL, *ne = m->data;
2929 25 : sql_column *cl;
2930 25 : int equal = 0;
2931 :
2932 25 : if (oe->type != e_cmp || ne->type != e_cmp ||
2933 25 : oe->flag != cmp_equal ||
2934 25 : ne->flag != cmp_equal || is_anti(oe) || is_anti(ne))
2935 : return rel;
2936 :
2937 25 : if ((cl = exp_find_column(rel->l, oe->l, -2)) != NULL) {
2938 25 : le = oe->l;
2939 25 : re = oe->r;
2940 0 : } else if ((cl = exp_find_column(rel->l, oe->r, -2)) != NULL) {
2941 0 : le = oe->r;
2942 0 : re = oe->l;
2943 : } else
2944 : return rel;
2945 :
2946 25 : if (exp_find_column(rl, ne->l, -2) == cl) {
2947 25 : sql_exp *e = (or != r)?rel_find_exp(or, re):re;
2948 :
2949 25 : if (e)
2950 24 : equal = exp_match_exp(ne->r, e);
2951 25 : if (!e || !equal)
2952 : return rel;
2953 0 : re = ne->r;
2954 0 : } else if (exp_find_column(rl, ne->r, -2) == cl) {
2955 0 : sql_exp *e = (or != r)?rel_find_exp(or, re):re;
2956 :
2957 0 : if (e)
2958 0 : equal = exp_match_exp(ne->l, e);
2959 0 : if (!e || !equal)
2960 : return rel;
2961 0 : re = ne->l;
2962 : } else
2963 : return rel;
2964 :
2965 0 : ne = exp_compare(v->sql->sa, le, re, cmp_equal);
2966 0 : append(exps, ne);
2967 : }
2968 :
2969 0 : rel->r = rel_dup(r->r);
2970 0 : rel->exps = exps;
2971 0 : rel_destroy(or);
2972 0 : v->changes++;
2973 : }
2974 : }
2975 : return rel;
2976 : }
2977 :
2978 : /*
2979 : * Push semijoins down, pushes the semijoin through a join.
2980 : *
2981 : * semijoin( join(A, B) [ A.x == B.y ], C ) [ A.z == C.c ]
2982 : * ->
2983 : * join( semijoin(A, C) [ A.z == C.c ], B ) [ A.x == B.y ]
2984 : *
2985 : * also push simple expressions of a semijoin down if they only
2986 : * involve the left sided of the semijoin.
2987 : *
2988 : * in some cases the other way is useful, ie push join down
2989 : * semijoin. When the join reduces (ie when there are selects on it).
2990 : *
2991 : * At the moment, we only flag changes by this optimizer on the first level of optimization
2992 : */
2993 : static inline sql_rel *
2994 467788 : rel_push_semijoin_down_or_up(visitor *v, sql_rel *rel)
2995 : {
2996 467788 : uint8_t cycle = *(uint8_t*) v->data;
2997 :
2998 467788 : if (rel->op == op_join && rel->exps && rel->l) {
2999 430464 : sql_rel *l = rel->l, *r = rel->r;
3000 :
3001 430464 : if (is_semi(l->op) && !rel_is_ref(l) && is_select(r->op) && !rel_is_ref(r)) {
3002 22 : rel->l = l->l;
3003 22 : l->l = rel;
3004 22 : if (cycle <= 0)
3005 0 : v->changes++;
3006 22 : return l;
3007 : }
3008 : }
3009 : /* also case with 2 joins */
3010 : /* join ( join ( semijoin(), table), select (table)); */
3011 467766 : if (rel->op == op_join && rel->exps && rel->l) {
3012 430442 : sql_rel *l = rel->l, *r = rel->r;
3013 430442 : sql_rel *ll;
3014 :
3015 430442 : if (is_join(l->op) && !rel_is_ref(l) && is_select(r->op) && !rel_is_ref(r)) {
3016 8164 : ll = l->l;
3017 8164 : if (is_semi(ll->op) && !rel_is_ref(ll)) {
3018 51 : l->l = ll->l;
3019 51 : ll->l = rel;
3020 51 : if (cycle <= 0)
3021 12 : v->changes++;
3022 51 : return ll;
3023 : }
3024 : }
3025 : }
3026 : /* first push down the expressions involving only A */
3027 467715 : if (rel->op == op_semi && rel->exps && rel->l) {
3028 12296 : sql_rel *jl = rel->l, *ojl = jl;
3029 :
3030 12296 : set_processed(jl);
3031 28164 : for (node *n = rel->exps->h; n;) {
3032 15868 : node *next = n->next;
3033 15868 : sql_exp *e = n->data;
3034 :
3035 15868 : if (n != rel->exps->h && e->type == e_cmp && rel_rebind_exp(v->sql, jl, e)) {
3036 16 : if (!is_select(jl->op) || rel_is_ref(jl))
3037 14 : rel->l = jl = rel_select(v->sql->sa, jl, NULL);
3038 16 : rel_select_add_exp(v->sql->sa, jl, e);
3039 16 : list_remove_node(rel->exps, NULL, n);
3040 16 : if (cycle <= 0)
3041 16 : v->changes++;
3042 : }
3043 : n = next;
3044 : }
3045 12296 : if (ojl != jl)
3046 14 : set_processed(jl);
3047 : }
3048 467715 : if (rel->op == op_semi && rel->exps && rel->l) {
3049 12296 : operator_type op = rel->op, lop;
3050 12296 : node *n;
3051 12296 : sql_rel *l = rel->l, *ll = NULL, *lr = NULL;
3052 12296 : sql_rel *r = rel->r;
3053 12296 : list *exps = rel->exps, *nsexps, *njexps, *nsattr, *njattr;
3054 12296 : int left = 1, right = 1;
3055 :
3056 : /* handle project
3057 : if (l->op == op_project && !need_distinct(l))
3058 : l = l->l;
3059 : */
3060 :
3061 12296 : if (!is_join(l->op) || is_full(l->op) || rel_is_ref(l) || is_single(l))
3062 : return rel;
3063 :
3064 1219 : lop = l->op;
3065 1219 : ll = l->l;
3066 1219 : lr = l->r;
3067 :
3068 : /* check which side is used and other exps are atoms or from right of semijoin */
3069 2348 : for(n = exps->h; n; n = n->next) {
3070 1346 : sql_exp *sje = n->data;
3071 :
3072 1346 : if (sje->type != e_cmp || is_complex_exp(sje->flag))
3073 : return rel;
3074 : /* sje->l from ll and sje->r/f from semijoin r ||
3075 : * sje->l from semijoin r and sje->r/f from ll ||
3076 : * sje->l from lr and sje->r/f from semijoin r ||
3077 : * sje->l from semijoin r and sje->r/f from lr */
3078 2628 : if (left &&
3079 2628 : ((rel_rebind_exp(v->sql, ll, sje->l) && rel_rebind_exp(v->sql, rel->r, sje->r) && (!sje->f || rel_rebind_exp(v->sql, rel->r, sje->f))) ||
3080 1282 : (rel_rebind_exp(v->sql, rel->r, sje->l) && rel_rebind_exp(v->sql, ll, sje->r) && (!sje->f || rel_rebind_exp(v->sql, ll, sje->f)))))
3081 : right = 0;
3082 : else
3083 955 : left = 0;
3084 1785 : if (right &&
3085 1660 : ((rel_rebind_exp(v->sql, lr, sje->l) && rel_rebind_exp(v->sql, rel->r, sje->r) && (!sje->f || rel_rebind_exp(v->sql, rel->r, sje->f))) ||
3086 566 : (rel_rebind_exp(v->sql, rel->r, sje->l) && rel_rebind_exp(v->sql, lr, sje->r) && (!sje->f || rel_rebind_exp(v->sql, lr, sje->f)))))
3087 : left = 0;
3088 : else
3089 : right = 0;
3090 1314 : if (!right && !left)
3091 : return rel;
3092 : }
3093 1002 : if (left && is_right(lop))
3094 : return rel;
3095 1001 : if (right && is_left(lop))
3096 : return rel;
3097 999 : nsexps = exps_copy(v->sql, rel->exps);
3098 999 : nsattr = exps_copy(v->sql, rel->attr);
3099 999 : njexps = exps_copy(v->sql, l->exps);
3100 999 : njattr = exps_copy(v->sql, l->attr);
3101 999 : if (left)
3102 231 : l = rel_crossproduct(v->sql->sa, rel_dup(ll), rel_dup(r), op);
3103 : else
3104 768 : l = rel_crossproduct(v->sql->sa, rel_dup(lr), rel_dup(r), op);
3105 999 : l->exps = nsexps;
3106 999 : l->attr = nsattr;
3107 999 : set_processed(l);
3108 999 : if (left)
3109 231 : l = rel_crossproduct(v->sql->sa, l, rel_dup(lr), lop);
3110 : else
3111 768 : l = rel_crossproduct(v->sql->sa, rel_dup(ll), l, lop);
3112 999 : l->exps = njexps;
3113 999 : l->attr = njattr;
3114 999 : set_processed(l);
3115 999 : rel_destroy(rel);
3116 999 : rel = l;
3117 999 : if (cycle <= 0)
3118 587 : v->changes++;
3119 : }
3120 : return rel;
3121 : }
3122 :
3123 : /* antijoin(a, union(b,c)) -> antijoin(antijoin(a,b), c) */
3124 : static inline sql_rel *
3125 6561 : rel_rewrite_antijoin(visitor *v, sql_rel *rel)
3126 : {
3127 6561 : sql_rel *l = rel->l;
3128 6561 : sql_rel *r = rel->r;
3129 :
3130 6561 : assert(rel->op == op_anti);
3131 6561 : if (l && !rel_is_ref(l) && r && !rel_is_ref(r) && is_union(r->op) && !is_single(r)) {
3132 0 : sql_rel *rl = rel_dup(r->l), *nl;
3133 0 : sql_rel *rr = rel_dup(r->r);
3134 :
3135 0 : if (!is_project(rl->op))
3136 0 : rl = rel_project(v->sql->sa, rl,
3137 : rel_projections(v->sql, rl, NULL, 1, 1));
3138 0 : if (!is_project(rr->op))
3139 0 : rr = rel_project(v->sql->sa, rr,
3140 : rel_projections(v->sql, rr, NULL, 1, 1));
3141 0 : rel_rename_exps(v->sql, r->exps, rl->exps);
3142 0 : rel_rename_exps(v->sql, r->exps, rr->exps);
3143 :
3144 0 : nl = rel_crossproduct(v->sql->sa, rel->l, rl, op_anti);
3145 0 : nl->exps = exps_copy(v->sql, rel->exps);
3146 0 : nl->attr = exps_copy(v->sql, rel->attr);
3147 0 : set_processed(nl);
3148 0 : rel->l = nl;
3149 0 : rel->r = rr;
3150 0 : rel_destroy(r);
3151 0 : v->changes++;
3152 0 : return rel;
3153 : }
3154 : return rel;
3155 : }
3156 :
3157 : static sql_rel *
3158 3463677 : rel_optimize_semi_and_anti_(visitor *v, sql_rel *rel)
3159 : {
3160 : /* rewrite semijoin (A, join(A,B)) into semijoin (A,B) */
3161 3463677 : if (rel && is_semi(rel->op))
3162 18911 : rel = rel_rewrite_semijoin(v, rel);
3163 : /* push semijoin through join */
3164 3463677 : if (rel && (is_semi(rel->op) || is_innerjoin(rel->op)))
3165 467788 : rel = rel_push_semijoin_down_or_up(v, rel);
3166 : /* antijoin(a, union(b,c)) -> antijoin(antijoin(a,b), c) */
3167 3463677 : if (rel && rel->op == op_anti)
3168 6561 : rel = rel_rewrite_antijoin(v, rel);
3169 3463677 : return rel;
3170 : }
3171 :
3172 : static sql_rel *
3173 91276 : rel_optimize_semi_and_anti(visitor *v, global_props *gp, sql_rel *rel)
3174 : {
3175 91276 : v->data = &gp->opt_cycle;
3176 91276 : rel = rel_visitor_bottomup(v, rel, &rel_optimize_semi_and_anti_);
3177 91276 : v->data = gp;
3178 91276 : return rel;
3179 : }
3180 :
3181 : run_optimizer
3182 629542 : bind_optimize_semi_and_anti(visitor *v, global_props *gp)
3183 : {
3184 : /* Important -> Re-write semijoins after rel_join_order */
3185 629542 : int flag = v->sql->sql_optimizer;
3186 629331 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
3187 1258873 : || gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti]) && (flag & optimize_semi_and_anti) ? rel_optimize_semi_and_anti : NULL;
3188 : }
3189 :
3190 :
3191 : static sql_rel *
3192 1610023 : rel_semijoin_use_fk(visitor *v, sql_rel *rel)
3193 : {
3194 1610023 : if (is_semi(rel->op) && rel->exps) {
3195 6602 : list *exps = rel->exps;
3196 6602 : list *rels = sa_list(v->sql->sa);
3197 :
3198 6602 : rel->exps = NULL;
3199 6602 : append(rels, rel->l);
3200 6602 : append(rels, rel->r);
3201 6602 : (void) find_fk( v->sql, rels, exps);
3202 :
3203 6602 : rel->exps = exps;
3204 : }
3205 1610023 : return rel;
3206 : }
3207 :
3208 : /*
3209 : * Push {semi}joins down, pushes the joins through group by expressions.
3210 : * When the join is on the group by columns, we can push the joins left
3211 : * under the group by. This should only be done, iff the new semijoin would
3212 : * reduce the input table to the groupby. So there should be a reduction
3213 : * (selection) on the table A and this should be propagated to the groupby via
3214 : * for example a primary key.
3215 : *
3216 : * {semi}join( A, groupby( B ) [gbe][aggrs] ) [ gbe == A.x ]
3217 : * ->
3218 : * {semi}join( A, groupby( semijoin(B,A) [gbe == A.x] ) [gbe][aggrs] ) [ gbe == A.x ]
3219 : */
3220 : static inline sql_rel *
3221 1610022 : rel_push_join_down(visitor *v, sql_rel *rel)
3222 : {
3223 1610022 : if (!rel_is_ref(rel) && ((is_left(rel->op) || rel->op == op_join || is_semi(rel->op)) && rel->l && rel->exps)) {
3224 233676 : sql_rel *gb = rel->r, *ogb = gb, *l = NULL, *rell = rel->l;
3225 :
3226 233676 : if (is_simple_project(gb->op) && !rel_is_ref(gb))
3227 46133 : gb = gb->l;
3228 :
3229 233676 : if (rel_is_ref(rell) || !gb || rel_is_ref(gb))
3230 : return rel;
3231 :
3232 223769 : if (is_groupby(gb->op) && gb->r && list_length(gb->r)) {
3233 190 : list *exps = rel->exps, *jes = new_exp_list(v->sql->sa), *gbes = gb->r;
3234 190 : node *n, *m;
3235 : /* find out if all group by expressions are used in the join */
3236 195 : for(n = gbes->h; n; n = n->next) {
3237 190 : sql_exp *gbe = n->data;
3238 190 : int fnd = 0;
3239 190 : const char *rname = NULL, *name = NULL;
3240 :
3241 : /* project in between, ie find alias */
3242 : /* first find expression in expression list */
3243 190 : gbe = exps_uses_exp( gb->exps, gbe);
3244 190 : if (!gbe)
3245 0 : continue;
3246 190 : if (ogb != gb)
3247 167 : gbe = exps_uses_exp( ogb->exps, gbe);
3248 190 : if (gbe) {
3249 149 : rname = exp_find_rel_name(gbe);
3250 149 : name = exp_name(gbe);
3251 : }
3252 :
3253 149 : if (!name)
3254 41 : return rel;
3255 :
3256 370 : for (m = exps->h; m && !fnd; m = m->next) {
3257 221 : sql_exp *je = m->data;
3258 :
3259 221 : if (je->card >= CARD_ATOM && je->type == e_cmp &&
3260 221 : !is_complex_exp(je->flag)) {
3261 : /* expect right expression to match */
3262 221 : sql_exp *r = je->r;
3263 :
3264 221 : if (r == 0 || r->type != e_column)
3265 10 : continue;
3266 211 : if (r->l && rname && strcmp(r->l, rname) == 0 && strcmp(r->r, name)==0) {
3267 : fnd = 1;
3268 83 : } else if (!r->l && !rname && strcmp(r->r, name)==0) {
3269 : fnd = 1;
3270 : }
3271 : if (fnd) {
3272 128 : sql_exp *le = je->l;
3273 128 : sql_exp *re = exp_push_down_prj(v->sql, r, gb, gb->l);
3274 128 : if (!re || (list_length(jes) == 0 && !find_prop(le->p, PROP_HASHCOL))) {
3275 : fnd = 0;
3276 : } else {
3277 5 : int anti = is_anti(je), semantics = is_semantics(je);
3278 :
3279 5 : je = exp_compare(v->sql->sa, le, re, je->flag);
3280 5 : if (anti) set_anti(je);
3281 5 : if (semantics) set_semantics(je);
3282 5 : list_append(jes, je);
3283 : }
3284 : }
3285 : }
3286 : }
3287 149 : if (!fnd)
3288 : return rel;
3289 : }
3290 5 : l = rel_dup(rel->l);
3291 :
3292 : /* push join's left side (as semijoin) down group by */
3293 5 : l = gb->l = rel_crossproduct(v->sql->sa, gb->l, l, op_semi);
3294 5 : l->exps = jes;
3295 5 : set_processed(l);
3296 5 : v->changes++;
3297 5 : return rel;
3298 : }
3299 : }
3300 : return rel;
3301 : }
3302 :
3303 : static bool
3304 728 : check_projection_on_foreignside(sql_rel *r, list *pexps, int fk_left)
3305 : {
3306 : /* projection columns from the foreign side */
3307 728 : if (list_empty(pexps))
3308 : return true;
3309 3156 : for (node *n = pexps->h; n; n = n->next) {
3310 3091 : sql_exp *pe = n->data;
3311 :
3312 3091 : if (pe && is_atom(pe->type))
3313 23 : continue;
3314 3068 : if (pe && !is_alias(pe->type))
3315 : return false;
3316 : /* check for columns from the pk side, then keep the join with the pk */
3317 3047 : if ((fk_left && rel_find_exp(r->r, pe)) || (!fk_left && rel_find_exp(r->l, pe)))
3318 594 : return false;
3319 : }
3320 : return true;
3321 : }
3322 :
3323 : static sql_rel *
3324 240164 : rel_simplify_project_fk_join(mvc *sql, sql_rel *r, list *pexps, list *orderexps, int *changes)
3325 : {
3326 240164 : sql_rel *rl = r->l, *rr = r->r, *nr = NULL;
3327 240164 : sql_exp *je, *le, *nje, *re;
3328 240164 : int fk_left = 1;
3329 :
3330 : /* check for foreign key join */
3331 240164 : if (list_length(r->exps) != 1 || !list_empty(r->attr))
3332 7522 : return r;
3333 232642 : if (!(je = exps_find_prop(r->exps, PROP_JOINIDX)) || je->flag != cmp_equal)
3334 : return r;
3335 : /* je->l == foreign expression, je->r == primary expression */
3336 1204 : if (rel_find_exp(r->l, je->l)) {
3337 : fk_left = 1;
3338 34 : } else if (rel_find_exp(r->r, je->l)) {
3339 : fk_left = 0;
3340 : } else { /* not found */
3341 : return r;
3342 : }
3343 :
3344 : /* primary side must be a full table */
3345 1170 : if ((fk_left && (!is_left(r->op) && !is_full(r->op)) && !is_basetable(rr->op)) ||
3346 34 : (!fk_left && (!is_right(r->op) && !is_full(r->op)) && !is_basetable(rl->op)))
3347 554 : return r;
3348 :
3349 650 : if (!check_projection_on_foreignside(r, pexps, fk_left) || !check_projection_on_foreignside(r, orderexps, fk_left))
3350 613 : return r;
3351 :
3352 : /* rewrite, ie remove pkey side if possible */
3353 37 : le = (sql_exp*)je->l, re = (sql_exp*)je->l;
3354 :
3355 : /* both have NULL and there are semantics, the join cannot be removed */
3356 37 : if (is_semantics(je) && has_nil(le) && has_nil(re))
3357 : return r;
3358 :
3359 37 : (*changes)++;
3360 : /* if the foreign key column doesn't have NULL values, then return it */
3361 37 : if (!has_nil(le) || is_full(r->op) || (fk_left && is_left(r->op)) || (!fk_left && is_right(r->op))) {
3362 : /* if ->attr, introduce group by on index */
3363 31 : if (fk_left) {
3364 23 : nr = rel_dup(r->l);
3365 : } else {
3366 8 : nr = rel_dup(r->r);
3367 : }
3368 31 : if (!list_empty(r->attr)) {
3369 0 : nr = rel_groupby(sql, nr, NULL);
3370 0 : if (nr) {
3371 : // printf("# introduced groupby \n");
3372 0 : nr->r = append(sa_list(sql->sa), le);
3373 0 : nr->exps = r->attr;
3374 : }
3375 : }
3376 31 : return nr;
3377 : }
3378 :
3379 : /* remove NULL values, ie generate a select not null */
3380 6 : nje = exp_compare(sql->sa, exp_ref(sql, le), exp_atom(sql->sa, atom_general(sql->sa, exp_subtype(le), NULL, 0)), cmp_equal);
3381 6 : set_anti(nje);
3382 6 : set_has_no_nil(nje);
3383 6 : set_semantics(nje);
3384 6 : if (fk_left) {
3385 6 : nr = rel_dup(r->l);
3386 : } else {
3387 0 : nr = rel_dup(r->r);
3388 : }
3389 6 : nr = rel_select(sql->sa, nr, nje);
3390 6 : set_processed(nr);
3391 6 : return nr;
3392 : }
3393 :
3394 : static sql_rel *
3395 1853 : rel_simplify_count_fk_join(mvc *sql, sql_rel *r, list *gexps, list *gcols, int *changes)
3396 : {
3397 1853 : sql_rel *rl = r->l, *rr = r->r, *nr = NULL;
3398 1853 : sql_exp *je, *le, *nje, *re, *oce;
3399 1853 : int fk_left = 1;
3400 :
3401 : /* check for foreign key join */
3402 1853 : if (list_length(r->exps) != 1)
3403 : return r;
3404 1852 : if (!(je = exps_find_prop(r->exps, PROP_JOINIDX)) || je->flag != cmp_equal)
3405 : return r;
3406 : /* je->l == foreign expression, je->r == primary expression */
3407 63 : if (rel_find_exp(r->l, je->l)) {
3408 : fk_left = 1;
3409 7 : } else if (rel_find_exp(r->r, je->l)) {
3410 : fk_left = 0;
3411 : } else { /* not found */
3412 : return r;
3413 : }
3414 :
3415 63 : oce = gexps->h->data;
3416 63 : if (oce->l) /* we only handle COUNT(*) */
3417 : return r;
3418 :
3419 : /* primary side must be a full table */
3420 62 : if ((fk_left && (!is_left(r->op) && !is_full(r->op)) && !is_basetable(rr->op)) ||
3421 6 : (!fk_left && (!is_right(r->op) && !is_full(r->op)) && !is_basetable(rl->op)))
3422 : return r;
3423 :
3424 33 : if (fk_left && is_join(rl->op) && !rel_is_ref(rl)) {
3425 12 : r->l = rel_simplify_count_fk_join(sql, rl, gexps, gcols, changes);
3426 12 : if (rl != r->l)
3427 9 : rel_destroy(rl);
3428 : }
3429 39 : if (!fk_left && is_join(rr->op) && !rel_is_ref(rr)) {
3430 2 : r->r = rel_simplify_count_fk_join(sql, rr, gexps, gcols, changes);
3431 2 : if (rr != r->r)
3432 2 : rel_destroy(rr);
3433 : }
3434 :
3435 39 : if (!check_projection_on_foreignside(r, gcols, fk_left))
3436 : return r;
3437 :
3438 : /* rewrite, ie remove pkey side if possible */
3439 37 : le = (sql_exp*)je->l, re = (sql_exp*)je->l;
3440 :
3441 : /* both have NULL and there are semantics, the join cannot be removed */
3442 37 : if (is_semantics(je) && has_nil(le) && has_nil(re))
3443 : return r;
3444 :
3445 37 : (*changes)++;
3446 : /* if the foreign key column doesn't have NULL values, then return it */
3447 37 : if (!has_nil(le) || is_full(r->op) || (fk_left && is_left(r->op)) || (!fk_left && is_right(r->op))) {
3448 31 : if (fk_left) {
3449 25 : nr = rel_dup(r->l);
3450 : } else {
3451 6 : nr = rel_dup(r->r);
3452 : }
3453 31 : return nr;
3454 : }
3455 :
3456 : /* remove NULL values, ie generate a select not null */
3457 6 : nje = exp_compare(sql->sa, exp_ref(sql, le), exp_atom(sql->sa, atom_general(sql->sa, exp_subtype(le), NULL, 0)), cmp_equal);
3458 6 : set_anti(nje);
3459 6 : set_has_no_nil(nje);
3460 6 : set_semantics(nje);
3461 6 : if (fk_left) {
3462 6 : nr = rel_dup(r->l);
3463 : } else {
3464 0 : nr = rel_dup(r->r);
3465 : }
3466 6 : nr = rel_select(sql->sa, nr, nje);
3467 6 : set_processed(nr);
3468 6 : return nr;
3469 : }
3470 :
3471 : /*
3472 : * Handle (left/right/outer/natural) join fk-pk rewrites
3473 : * 1 group by ( fk-pk-join () ) [ count(*) ] -> group by ( fk )
3474 : * 2 project ( fk-pk-join () ) [ fk-column ] -> project (fk table)[ fk-column ]
3475 : * 3 project ( fk1-pk1-join( fk2-pk2-join()) [ fk-column, pk1 column ] -> project (fk1-pk1-join)[ fk-column, pk1 column ]
3476 : */
3477 : static inline sql_rel *
3478 3689377 : rel_simplify_fk_joins(visitor *v, sql_rel *rel)
3479 : {
3480 3689377 : sql_rel *r = NULL;
3481 :
3482 3689377 : if (is_simple_project(rel->op))
3483 1204762 : r = rel->l;
3484 :
3485 3689414 : while (is_simple_project(rel->op) && r && list_length(r->exps) == 1 && (is_join(r->op) || r->op == op_semi) && !(rel_is_ref(r))) {
3486 240164 : sql_rel *or = r;
3487 :
3488 240164 : r = rel_simplify_project_fk_join(v->sql, r, rel->exps, rel->r, &v->changes);
3489 240164 : if (r == or)
3490 : return rel;
3491 37 : rel_destroy(rel->l);
3492 37 : rel->l = r;
3493 : }
3494 :
3495 3449249 : if (!is_groupby(rel->op))
3496 : return rel;
3497 :
3498 90662 : r = rel->l;
3499 134912 : while(r && is_simple_project(r->op))
3500 44250 : r = r->l;
3501 :
3502 105163 : while (is_groupby(rel->op) && !rel_is_ref(rel) && r && (is_join(r->op) || r->op == op_semi) && list_length(r->exps) == 1 && !(rel_is_ref(r)) &&
3503 : /* currently only single count aggregation is handled, no other projects or aggregation */
3504 109198 : list_length(rel->exps) == 1 && exp_aggr_is_count(rel->exps->h->data)) {
3505 1839 : sql_rel *or = r;
3506 :
3507 1839 : r = rel_simplify_count_fk_join(v->sql, r, rel->exps, rel->r, &v->changes);
3508 1839 : if (r == or)
3509 : return rel;
3510 26 : rel_destroy(rel->l);
3511 26 : rel->l = r;
3512 : }
3513 : return rel;
3514 : }
3515 :
3516 : /*
3517 : * Gets the column expressions of a diff function and adds them to "columns".
3518 : * The diff function has two possible argument types: either a sql_exp representing a column
3519 : * or a sql_exp representing another diff function, therefore this function is recursive.
3520 : */
3521 : static void
3522 168 : get_diff_function_columns(sql_exp *diffExp, list *columns) {
3523 168 : list *args = diffExp->l;
3524 :
3525 370 : for (node *arg = args->h; arg; arg = arg->next) {
3526 202 : sql_exp *exp = arg->data;
3527 :
3528 : // diff function
3529 202 : if (exp->type == e_func) {
3530 34 : get_diff_function_columns(exp, columns);
3531 : }
3532 : // column
3533 : else {
3534 168 : list_append(columns, exp);
3535 : }
3536 : }
3537 168 : }
3538 :
3539 : /*
3540 : * Builds a list of aggregation key columns to be used by the select push down algorithm, namely for
3541 : * window functions. Returns NULL if the window function does not partition by any column
3542 : */
3543 : static list *
3544 1735 : get_partition_by_key_columns(allocator *sa, sql_rel *r) {
3545 18832 : for (node* n = r->exps->h; n; n = n->next) {
3546 17321 : sql_exp *e = n->data;
3547 :
3548 17321 : if (e->type == e_func) {
3549 6035 : sql_subfunc *f = e->f;
3550 :
3551 : // aggregation function
3552 6035 : if (!strcmp(f->func->base.name, "rank")) {
3553 224 : list* rankArguments = e->l;
3554 : // the partition key is the second argument
3555 224 : sql_exp *partitionExp = rankArguments->h->next->data;
3556 :
3557 : // check if the key contains any columns, i.e., is a diff function
3558 224 : if (partitionExp->type == e_func) {
3559 : // get columns to list
3560 134 : list *aggColumns = sa_list(sa);
3561 134 : get_diff_function_columns(partitionExp, aggColumns);
3562 134 : return aggColumns;
3563 : }
3564 : // the function has no aggregation columns (e_atom of boolean)
3565 : else {
3566 : return NULL;
3567 : }
3568 :
3569 : }
3570 : }
3571 : }
3572 : return NULL;
3573 : }
3574 :
3575 : /*
3576 : static bool
3577 : rank_exp_has_partition_key(sql_exp *e)
3578 : {
3579 : if (e->type == e_func) {
3580 : sql_subfunc *f = e->f;
3581 :
3582 : if (f->func->type == F_ANALYTIC) {
3583 : list *args = e->l;
3584 :
3585 : if (list_length(args) >= 2) { // the partition key is the second argument
3586 : return true;
3587 : }
3588 : }
3589 : }
3590 : return false;
3591 : }
3592 : */
3593 :
3594 : /*
3595 : * Checks if a filter column is also used as an aggregation key, so it can be later safely pushed down.
3596 : */
3597 : static int
3598 187 : filter_column_in_partition_by_columns(sql_exp *column, list *keyColumns)
3599 : {
3600 : /* check if it is a column or an e_convert, and get the actual column if it is the latter */
3601 187 : if (column->type == e_convert) {
3602 1 : column = column->l;
3603 : }
3604 :
3605 187 : char *tableName = column->l;
3606 187 : char *columnName = column->r;
3607 :
3608 404 : for (node *n = keyColumns->h; n; n = n->next) {
3609 226 : sql_exp *keyCol = n->data;
3610 226 : char *keyColTableName = keyCol->l;
3611 226 : char *keyColColumnName = keyCol->r;
3612 :
3613 226 : if (!strcmp(tableName, keyColTableName) && !strcmp(columnName, keyColColumnName)) {
3614 : /* match */
3615 : return 1;
3616 : }
3617 : }
3618 :
3619 : /* no matches found */
3620 : return 0;
3621 : }
3622 :
3623 : /*
3624 : * Push select down, pushes the selects through (simple) projections. Also
3625 : * it cleans up the projections which become useless.
3626 : *
3627 : * WARNING - Make sure to call try_remove_empty_select macro before returning so we ensure
3628 : * possible generated empty selects won't never be generated
3629 : */
3630 : static sql_rel *
3631 7303359 : rel_push_select_down(visitor *v, sql_rel *rel)
3632 : {
3633 7303359 : list *exps = NULL;
3634 7303359 : sql_rel *r = NULL;
3635 7303359 : node *n;
3636 :
3637 7303359 : if (rel_is_ref(rel)) {
3638 375164 : if (is_select(rel->op) && !list_empty(rel->exps)) {
3639 : /* add inplace empty select */
3640 1741 : sql_rel *l = rel_select(v->sql->sa, rel->l, NULL);
3641 :
3642 1741 : l->exps = rel->exps;
3643 1741 : set_processed(l);
3644 1741 : rel->exps = NULL;
3645 1741 : rel->l = l;
3646 1741 : v->changes++;
3647 : }
3648 375164 : return rel;
3649 : }
3650 :
3651 : /* don't make changes for empty selects */
3652 6928195 : if (is_select(rel->op) && list_empty(rel->exps))
3653 10 : return try_remove_empty_select(v, rel);
3654 :
3655 : /* merge 2 selects */
3656 6928186 : r = rel->l;
3657 6928186 : if (is_select(rel->op) && r && r->exps && is_select(r->op) && !(rel_is_ref(r)) && !exps_have_func(rel->exps)) {
3658 27 : (void)list_merge(r->exps, rel->exps, (fdup)NULL);
3659 27 : rel->l = NULL;
3660 27 : rel_destroy(rel);
3661 27 : v->changes++;
3662 27 : return try_remove_empty_select(v, r);
3663 : }
3664 : /*
3665 : * Push select through semi/anti join
3666 : * select (semi(A,B)) == semi(select(A), B)
3667 : */
3668 6928159 : if (is_select(rel->op) && r && is_semi(r->op) && !(rel_is_ref(r))) {
3669 328 : rel->l = r->l;
3670 328 : r->l = rel;
3671 328 : v->changes++;
3672 : /*
3673 : * if A has 2 references (ie used on both sides of
3674 : * the semi join), we also push the select into A.
3675 : */
3676 328 : if (rel_is_ref(rel->l) && rel->l == rel_find_ref(r->r)){
3677 0 : sql_rel *lx = rel->l;
3678 0 : sql_rel *rx = r->r;
3679 0 : if (lx->ref.refcnt == 2 && !rel_is_ref(rx)) {
3680 0 : while (rx->l && !rel_is_ref(rx->l) &&
3681 0 : (is_project(rx->op) ||
3682 : is_select(rx->op) ||
3683 : is_join(rx->op)))
3684 : rx = rx->l;
3685 : /* probably we need to introduce a project */
3686 0 : rel_destroy(rel->l);
3687 0 : lx = rel_project(v->sql->sa, rel, rel_projections(v->sql, rel, NULL, 1, 1));
3688 0 : r->l = lx;
3689 0 : rx->l = rel_dup(lx);
3690 : }
3691 : }
3692 328 : return r;
3693 : }
3694 6927831 : exps = rel->exps;
3695 :
3696 : /* push select through join */
3697 6927831 : if (is_select(rel->op) && r && is_join(r->op) && !rel_is_ref(r) && !is_single(r)){
3698 22276 : sql_rel *jl = r->l, *ojl = jl, *jr = r->r, *ojr = jr;
3699 22276 : int left = r->op == op_join || r->op == op_left;
3700 22276 : int right = r->op == op_join || r->op == op_right;
3701 :
3702 22276 : if (r->op == op_full)
3703 : return rel;
3704 :
3705 : /* introduce selects under the join (if needed) */
3706 22254 : set_processed(jl);
3707 22254 : set_processed(jr);
3708 48964 : for (n = exps->h; n;) {
3709 26710 : node *next = n->next;
3710 26710 : sql_exp *e = n->data;
3711 :
3712 26710 : if (!exp_unsafe(e, false, true)) {
3713 26500 : if (left && rel_rebind_exp(v->sql, jl, e)) {
3714 13532 : if (!is_select(jl->op) || rel_is_ref(jl))
3715 11296 : r->l = jl = rel_select(v->sql->sa, jl, NULL);
3716 13532 : rel_select_add_exp(v->sql->sa, jl, e);
3717 13532 : list_remove_node(exps, NULL, n);
3718 13532 : v->changes++;
3719 12968 : } else if (right && rel_rebind_exp(v->sql, jr, e)) {
3720 5224 : if (!is_select(jr->op) || rel_is_ref(jr))
3721 4257 : r->r = jr = rel_select(v->sql->sa, jr, NULL);
3722 5224 : rel_select_add_exp(v->sql->sa, jr, e);
3723 5224 : list_remove_node(exps, NULL, n);
3724 5224 : v->changes++;
3725 : }
3726 : }
3727 : n = next;
3728 : }
3729 22254 : if (ojl != jl)
3730 11296 : set_processed(jl);
3731 22254 : if (ojr != jr)
3732 4257 : set_processed(jr);
3733 : }
3734 :
3735 : /* merge select and cross product ? */
3736 6927809 : if (is_select(rel->op) && r && r->op == op_join && !rel_is_ref(r) && !is_single(r) && !exps_have_unsafe(exps, false, true)) {
3737 14500 : for (n = exps->h; n;) {
3738 1833 : node *next = n->next;
3739 1833 : sql_exp *e = n->data;
3740 :
3741 1833 : if (exp_is_join(e, NULL) == 0) {
3742 497 : if (!r->exps)
3743 150 : r->exps = sa_list(v->sql->sa);
3744 497 : append(r->exps, e);
3745 497 : list_remove_node(exps, NULL, n);
3746 497 : v->changes++;
3747 : }
3748 : n = next;
3749 : }
3750 : }
3751 :
3752 6927809 : if (is_select(rel->op) && r && (is_simple_project(r->op) || (is_groupby(r->op) && !list_empty(r->r))) && !rel_is_ref(r) && !is_single(r)){
3753 78458 : sql_rel *pl = r->l, *opl = pl;
3754 : /* we cannot push through window functions (for safety I disabled projects over DDL too) */
3755 78458 : if (pl && pl->op != op_ddl && !exps_have_unsafe(r->exps, false, false)) {
3756 : /* introduce selects under the project (if needed) */
3757 58814 : set_processed(pl);
3758 58814 : if (!pl->exps)
3759 417 : pl->exps = sa_list(v->sql->sa);
3760 125361 : for (n = exps->h; n;) {
3761 66547 : node *next = n->next;
3762 66547 : sql_exp *e = n->data, *ne = NULL;
3763 :
3764 : /* can we move it down */
3765 66547 : if (e->type == e_cmp && (ne = exp_push_down_prj(v->sql, e, r, pl)) && ne != e) {
3766 36985 : if (!(is_select(pl->op) && is_join(pl->op) && is_semi(pl->op)) || rel_is_ref(pl))
3767 36985 : r->l = pl = rel_select(v->sql->sa, pl, NULL);
3768 36985 : rel_select_add_exp(v->sql->sa, pl, ne);
3769 36985 : list_remove_node(exps, NULL, n);
3770 36985 : v->changes++;
3771 : }
3772 : n = next;
3773 : }
3774 58814 : if (opl != pl)
3775 28414 : set_processed(pl);
3776 : }
3777 :
3778 : /* push filters if they match the partition by key on a window function */
3779 1735 : else if (pl && pl->op != op_ddl && exps_have_unsafe(r->exps, false, false)) {
3780 1735 : set_processed(pl);
3781 : /* list of partition by key columns */
3782 1735 : list *keyColumns = get_partition_by_key_columns(v->sql->sa, r);
3783 :
3784 : /* partition by keys found, check if any filter matches them */
3785 1735 : if (keyColumns) {
3786 325 : for (n = exps->h; n;) {
3787 191 : node *next = n->next;
3788 191 : sql_exp *e = n->data, *ne = NULL;
3789 :
3790 191 : if (e->type == e_cmp) {
3791 : /* simple comparison filter */
3792 191 : if (e->flag == cmp_gt || e->flag == cmp_gte || e->flag == cmp_lte || e->flag == cmp_lt
3793 191 : || e->flag == cmp_equal || e->flag == cmp_notequal || e->flag == cmp_in || e->flag == cmp_notin
3794 5 : || (e->flag == cmp_filter && ((list*)e->l)->cnt == 1)) {
3795 187 : sql_exp* column;
3796 : /* the column in 'like' filters is stored inside a list */
3797 187 : if (e->flag == cmp_filter) {
3798 1 : column = ((list*)e->l)->h->data;
3799 : } else {
3800 186 : column = e->l;
3801 : }
3802 :
3803 : /* check if the expression matches any partition by key, meaning we can
3804 : try to safely push it down */
3805 187 : if (filter_column_in_partition_by_columns(column, keyColumns)) {
3806 9 : ne = exp_push_down_prj(v->sql, e, r, pl);
3807 :
3808 : /* can we move it down */
3809 9 : if (ne && ne != e && pl->exps) {
3810 9 : if (!is_select(pl->op) || rel_is_ref(pl))
3811 8 : r->l = pl = rel_select(v->sql->sa, pl, NULL);
3812 9 : rel_select_add_exp(v->sql->sa, pl, ne);
3813 9 : list_remove_node(exps, NULL, n);
3814 9 : v->changes++;
3815 : }
3816 : }
3817 : }
3818 : }
3819 : n = next;
3820 : }
3821 :
3822 : /* cleanup list */
3823 134 : list_destroy(keyColumns);
3824 : }
3825 : /* also push (rewrite) limits on output of row_number/(*)rank like window functions */
3826 1735 : if (is_simple_project(r->op) /*&& is_simple_project(pl->op)*/) { /* possible window functions */
3827 3653 : for (n = exps->h; n; n = n->next) {
3828 1926 : sql_exp *e = n->data;
3829 :
3830 1926 : if (e->type == e_cmp && (e->flag == cmp_lt || e->flag == cmp_lte) && exp_is_atom(e->r)) { /* simple limit */
3831 80 : sql_exp *ranke = rel_find_exp(r, e->l);
3832 :
3833 80 : if (ranke && ranke->type == e_func) {
3834 75 : sql_subfunc *rankf = ranke->f;
3835 75 : if (rankf->func->type == F_ANALYTIC) { /* rank functions cannot have a frame */
3836 : // For now only for rank/row_number without partition by
3837 74 : sql_rel *tn = NULL;
3838 74 : if (strcmp(rankf->func->base.name, "rank") == 0 && is_simple_project(pl->op) && pl->r /* &&
3839 : !rank_exp_has_partition_key(ranke)*/) {
3840 6 : tn = r->l = rel_topn(v->sql->sa, r->l, append(sa_list(v->sql->sa), e->r));
3841 6 : tn->grouped = 1;
3842 6 : v->changes++;
3843 6 : break;
3844 : }
3845 68 : if (strcmp(rankf->func->base.name, "row_number") == 0 && list_empty(r->r) && !is_topn(pl->op) /*&&
3846 : !rank_exp_has_partition_key(ranke)*/) {
3847 2 : tn = r->l = rel_topn(v->sql->sa, r->l, append(sa_list(v->sql->sa), e->r));
3848 2 : tn->grouped = 1;
3849 2 : v->changes++;
3850 2 : break;
3851 : }
3852 : }
3853 : }
3854 : }
3855 : }
3856 : }
3857 : }
3858 : }
3859 :
3860 : /* try push select under set relation */
3861 6927809 : if (is_select(rel->op) && r && is_set(r->op) && !list_empty(r->exps) && !rel_is_ref(r) && !is_single(r) && !list_empty(exps)) {
3862 19 : sql_rel *u = r, *ul = u->l, *ur = u->r;
3863 :
3864 19 : ul = rel_dup(ul);
3865 19 : ur = rel_dup(ur);
3866 19 : if (!is_project(ul->op))
3867 0 : ul = rel_project(v->sql->sa, ul,
3868 : rel_projections(v->sql, ul, NULL, 1, 1));
3869 19 : if (!is_project(ur->op))
3870 0 : ur = rel_project(v->sql->sa, ur,
3871 : rel_projections(v->sql, ur, NULL, 1, 1));
3872 19 : rel_rename_exps(v->sql, u->exps, ul->exps);
3873 19 : rel_rename_exps(v->sql, u->exps, ur->exps);
3874 :
3875 : /* introduce selects under the set */
3876 19 : ul = rel_select(v->sql->sa, ul, NULL);
3877 19 : ul->exps = exps_copy(v->sql, exps);
3878 19 : set_processed(ul);
3879 19 : ur = rel_select(v->sql->sa, ur, NULL);
3880 19 : ur->exps = exps_copy(v->sql, exps);
3881 19 : set_processed(ur);
3882 :
3883 19 : rel = rel_inplace_setop(v->sql, rel, ul, ur, u->op, rel_projections(v->sql, rel, NULL, 1, 1));
3884 19 : if (need_distinct(u))
3885 0 : set_distinct(rel);
3886 19 : v->changes++;
3887 : }
3888 6927809 : if (is_select(rel->op) && r && is_munion(r->op) && !is_recursive(r) && !list_empty(r->exps) && !rel_is_ref(r) && !is_single(r) && !list_empty(exps)) {
3889 4956 : sql_rel *u = r;
3890 4956 : list *rels = u->l, *nrels = sa_list(v->sql->sa);
3891 14876 : for(node *n = rels->h; n; n = n->next) {
3892 9920 : sql_rel *ul = n->data;
3893 9920 : ul = rel_dup(ul);
3894 9920 : if (!is_project(ul->op) || rel_is_ref(ul))
3895 9920 : ul = rel_project(v->sql->sa, ul,
3896 : rel_projections(v->sql, ul, NULL, 1, 1));
3897 9920 : rel_rename_exps(v->sql, u->exps, ul->exps);
3898 :
3899 : /* introduce selects under the set */
3900 9920 : ul = rel_select(v->sql->sa, ul, NULL);
3901 9920 : ul->exps = exps_copy(v->sql, exps);
3902 9920 : set_processed(ul);
3903 9920 : nrels = append(nrels, ul);
3904 : }
3905 :
3906 4956 : rel = rel_inplace_setop_n_ary(v->sql, rel, nrels, u->op, rel_projections(v->sql, rel, NULL, 1, 1));
3907 4956 : if (need_distinct(u))
3908 8 : set_distinct(rel);
3909 4956 : if (is_recursive(u))
3910 0 : set_recursive(rel);
3911 4956 : v->changes++;
3912 : }
3913 :
3914 6927809 : return try_remove_empty_select(v, rel);
3915 : }
3916 :
3917 : static int
3918 12033 : index_exp(sql_exp *e, sql_idx *i)
3919 : {
3920 12033 : if (e->type == e_cmp && !is_complex_exp(e->flag)) {
3921 6776 : switch(i->type) {
3922 6776 : case hash_idx:
3923 : case oph_idx:
3924 6776 : if (e->flag == cmp_equal)
3925 : return 0;
3926 : /* fall through */
3927 : case join_idx:
3928 : default:
3929 1252 : return -1;
3930 : }
3931 : }
3932 : return -1;
3933 : }
3934 :
3935 : /* find column for the select/join expression */
3936 : static sql_column *
3937 5524 : sjexp_col(sql_exp *e, sql_rel *r)
3938 : {
3939 5524 : sql_column *res = NULL;
3940 :
3941 5524 : if (e->type == e_cmp && !is_complex_exp(e->flag)) {
3942 5524 : res = exp_find_column(r, e->l, -2);
3943 5524 : if (!res)
3944 466 : res = exp_find_column(r, e->r, -2);
3945 : }
3946 5524 : return res;
3947 : }
3948 :
3949 : static sql_idx *
3950 1782909 : find_index(allocator *sa, sql_rel *rel, sql_rel *sub, list **EXPS)
3951 : {
3952 1782909 : node *n;
3953 :
3954 : /* any (partial) match of the expressions with the index columns */
3955 : /* Depending on the index type we may need full matches and only
3956 : limited number of cmp types (hash only equality etc) */
3957 : /* Depending on the index type we should (in the rel_bin) generate
3958 : more code, ie for spatial index add post filter etc, for hash
3959 : compute hash value and use index */
3960 :
3961 1782909 : if (sub->exps && rel->exps)
3962 7120456 : for(n = sub->exps->h; n; n = n->next) {
3963 5523002 : prop *p;
3964 5523002 : sql_exp *e = n->data;
3965 :
3966 5523002 : if ((p = find_prop(e->p, PROP_HASHIDX)) != NULL) {
3967 9409 : list *exps, *cols;
3968 9409 : sql_idx *i = p->value.pval;
3969 9409 : fcmp cmp = (fcmp)&sql_column_kc_cmp;
3970 :
3971 : /* join indices are only interesting for joins */
3972 9409 : if (i->type == join_idx || list_length(i->columns) <= 1)
3973 0 : continue;
3974 : /* based on the index type, find qualifying exps */
3975 9409 : exps = list_select(rel->exps, i, (fcmp) &index_exp, (fdup)NULL);
3976 9409 : if (list_empty(exps))
3977 4849 : continue;
3978 : /* now we obtain the columns, move into sql_column_kc_cmp! */
3979 4560 : cols = list_map(exps, sub, (fmap) &sjexp_col);
3980 :
3981 : /* TODO check that at most 2 relations are involved */
3982 :
3983 : /* Match the index columns with the expression columns.
3984 : TODO, Allow partial matches ! */
3985 4560 : if (list_match(cols, i->columns, cmp) == 0) {
3986 : /* re-order exps in index order */
3987 286 : node *n, *m;
3988 286 : list *es = sa_list(sa);
3989 :
3990 958 : for(n = i->columns->h; n; n = n->next) {
3991 672 : int i = 0;
3992 2152 : for(m = cols->h; m; m = m->next, i++) {
3993 2152 : if (cmp(m->data, n->data) == 0){
3994 672 : sql_exp *e = list_fetch(exps, i);
3995 672 : list_append(es, e);
3996 672 : break;
3997 : }
3998 : }
3999 : }
4000 : /* fix the destroy function */
4001 286 : cols->destroy = NULL;
4002 286 : *EXPS = es;
4003 286 : e->used = 1;
4004 286 : return i;
4005 : }
4006 4274 : cols->destroy = NULL;
4007 : }
4008 : }
4009 : return NULL;
4010 : }
4011 :
4012 : static inline sql_rel *
4013 1163339 : rel_use_index(visitor *v, sql_rel *rel)
4014 : {
4015 1163339 : list *exps = NULL;
4016 1163339 : sql_idx *i = find_index(v->sql->sa, rel, rel->l, &exps);
4017 1163340 : int left = 1;
4018 :
4019 1163340 : assert(is_select(rel->op) || is_join(rel->op));
4020 1163340 : if (!i && is_join(rel->op)) {
4021 619570 : left = 0;
4022 619570 : i = find_index(v->sql->sa, rel, rel->r, &exps);
4023 : }
4024 :
4025 1163160 : if (i) {
4026 286 : prop *p;
4027 286 : node *n;
4028 286 : int single_table = 1;
4029 286 : sql_exp *re = NULL;
4030 :
4031 956 : for( n = exps->h; n && single_table; n = n->next) {
4032 670 : sql_exp *e = n->data, *nre = e->l;
4033 :
4034 670 : if (!is_compare(e->type) || is_anti(e) || e->flag != cmp_equal)
4035 : return rel;
4036 670 : if (is_join(rel->op) && ((left && !rel_find_exp(rel->l, nre)) || (!left && rel_find_exp(rel->r, nre))))
4037 111 : nre = e->r;
4038 670 : single_table = (!re || (exp_relname(nre) && exp_relname(re) && strcmp(exp_relname(nre), exp_relname(re)) == 0));
4039 670 : re = nre;
4040 : }
4041 286 : if (single_table) { /* add PROP_HASHCOL to all column exps */
4042 932 : for( n = exps->h; n; n = n->next) {
4043 654 : sql_exp *e = n->data;
4044 :
4045 : /* swapped ? */
4046 654 : if (is_join(rel->op) && ((left && !rel_find_exp(rel->l, e->l)) || (!left && !rel_find_exp(rel->r, e->l)))) {
4047 165 : exp_swap(e);
4048 : }
4049 654 : p = find_prop(e->p, PROP_HASHCOL);
4050 654 : if (!p)
4051 285 : e->p = p = prop_create(v->sql->sa, PROP_HASHCOL, e->p);
4052 654 : p->value.pval = i;
4053 : }
4054 : }
4055 : /* add the remaining exps to the new exp list */
4056 286 : if (list_length(rel->exps) > list_length(exps)) {
4057 108 : for( n = rel->exps->h; n; n = n->next) {
4058 81 : sql_exp *e = n->data;
4059 81 : if (!list_find(exps, e, (fcmp)&exp_cmp))
4060 27 : list_append(exps, e);
4061 : }
4062 : }
4063 286 : rel->exps = exps;
4064 : }
4065 : return rel;
4066 : }
4067 :
4068 : static sql_rel *
4069 3689376 : rel_select_leftgroup_2_semi(visitor *v, sql_rel *rel)
4070 : {
4071 3689376 : if (rel_is_ref(rel) || !is_select(rel->op) || list_empty(rel->exps))
4072 3155931 : return rel;
4073 533445 : sql_rel *l = rel->l;
4074 :
4075 533445 : if (!l || rel_is_ref(l) || !is_left(l->op) || list_empty(l->attr))
4076 532459 : return rel;
4077 :
4078 1964 : for(node *n = rel->exps->h; n; n = n->next) {
4079 986 : sql_exp *e = n->data;
4080 :
4081 986 : if (e->type == e_cmp && !is_semantics(e) && !e->f) {
4082 973 : list *attrs = l->attr;
4083 973 : sql_exp *a = attrs->h->data;
4084 :
4085 973 : if (exps_find_exp(l->attr, e->l) && exp_is_true(e->r) && e->flag == cmp_equal /*&& exp_is_true(a)*/) {
4086 : // printf("# optimize select leftgroup -> semi\n");
4087 8 : if (!list_empty(l->exps)) {
4088 13 : for(node *m = l->exps->h; m; m = m->next) {
4089 7 : sql_exp *j = m->data;
4090 7 : reset_any(j);
4091 : }
4092 : }
4093 8 : l->attr = NULL;
4094 8 : l->op = exp_is_true(a)?op_semi:op_anti;
4095 8 : list_remove_node(rel->exps, NULL, n);
4096 8 : rel = rel_project(v->sql->sa, rel, rel_projections(v->sql, rel, NULL, 1, 1));
4097 8 : list_append(rel->exps, attrs->h->data);
4098 8 : v->changes++;
4099 8 : return rel;
4100 : }
4101 : }
4102 : }
4103 : return rel;
4104 : }
4105 :
4106 : static sql_rel *
4107 3689376 : rel_optimize_select_and_joins_topdown_(visitor *v, sql_rel *rel)
4108 : {
4109 : /* push_join_down introduces semijoins */
4110 3689376 : uint8_t cycle = *(uint8_t*) v->data;
4111 3689376 : if (cycle <= 0) {
4112 1610023 : rel = rel_semijoin_use_fk(v, rel);
4113 1610023 : rel = rel_push_join_down(v, rel);
4114 : }
4115 :
4116 3689376 : rel = rel_simplify_fk_joins(v, rel);
4117 3689376 : rel = rel_push_select_down(v, rel);
4118 3689376 : rel = rel_select_leftgroup_2_semi(v, rel);
4119 3689376 : if (rel && rel->l && (is_select(rel->op) || is_join(rel->op)))
4120 1163339 : rel = rel_use_index(v, rel);
4121 3689377 : return rel;
4122 : }
4123 :
4124 : static sql_rel *
4125 129189 : rel_optimize_select_and_joins_topdown(visitor *v, global_props *gp, sql_rel *rel)
4126 : {
4127 129189 : v->data = &gp->opt_cycle;
4128 129189 : rel = rel_visitor_topdown(v, rel, &rel_optimize_select_and_joins_topdown_);
4129 129190 : v->data = gp;
4130 129190 : return rel;
4131 : }
4132 :
4133 : run_optimizer
4134 629565 : bind_optimize_select_and_joins_topdown(visitor *v, global_props *gp)
4135 : {
4136 629565 : int flag = v->sql->sql_optimizer;
4137 629370 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
4138 543614 : || gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti] ||
4139 1258935 : gp->cnt[op_select]) && (flag & optimize_select_and_joins_topdown) ? rel_optimize_select_and_joins_topdown : NULL;
4140 : }
4141 :
4142 :
4143 : static int
4144 1255629 : can_push_func(sql_exp *e, sql_rel *rel, int *must, int depth)
4145 : {
4146 1300924 : switch(e->type) {
4147 1099026 : case e_cmp: {
4148 1099026 : sql_exp *l = e->l, *r = e->r, *f = e->f;
4149 :
4150 : /* don't push down functions inside attribute joins */
4151 1099026 : if (e->flag == cmp_or || e->flag == cmp_in || e->flag == cmp_notin || e->flag == cmp_filter || (is_join(rel->op) && is_any(e)))
4152 : return 0;
4153 1042930 : if (depth > 0) { /* for comparisons under the top ones, they become functions */
4154 58 : int lmust = 0;
4155 58 : int res = can_push_func(l, rel, &lmust, depth + 1) && can_push_func(r, rel, &lmust, depth + 1) &&
4156 20 : (!f || can_push_func(f, rel, &lmust, depth + 1));
4157 12 : if (res && !lmust)
4158 : return 1;
4159 54 : (*must) |= lmust;
4160 54 : return res;
4161 : } else {
4162 1042872 : int mustl = 0, mustr = 0, mustf = 0;
4163 1042872 : return ((l->type == e_column || can_push_func(l, rel, &mustl, depth + 1)) && (*must = mustl)) ||
4164 2078593 : ((r->type == e_column || can_push_func(r, rel, &mustr, depth + 1)) && (*must = mustr)) ||
4165 3648 : ((f && (f->type == e_column || can_push_func(f, rel, &mustf, depth + 1)) && (*must = mustf)));
4166 : }
4167 : }
4168 45295 : case e_convert:
4169 45295 : return can_push_func(e->l, rel, must, depth + 1);
4170 9464 : case e_aggr:
4171 : case e_func: {
4172 9464 : list *l = e->l;
4173 9464 : int res = 1, lmust = 0;
4174 :
4175 9464 : if (exp_unsafe(e, false, false))
4176 : return 0;
4177 26958 : if (l) for (node *n = l->h; n && res; n = n->next)
4178 17502 : res &= can_push_func(n->data, rel, &lmust, depth + 1);
4179 9456 : if (res && !lmust)
4180 : return 1;
4181 8609 : (*must) |= lmust;
4182 8609 : return res;
4183 : }
4184 51581 : case e_column:
4185 51581 : if (rel && !rel_find_exp(rel, e))
4186 : return 0;
4187 30305 : (*must) = 1;
4188 : /* fall through */
4189 : default:
4190 : return 1;
4191 : }
4192 : }
4193 :
4194 : static int
4195 911508 : exps_can_push_func(list *exps, sql_rel *rel)
4196 : {
4197 3919266 : for(node *n = exps->h; n; n = n->next) {
4198 3032201 : sql_exp *e = n->data;
4199 3032201 : int mustl = 0, mustr = 0;
4200 :
4201 3032201 : if ((is_joinop(rel->op) || is_select(rel->op)) && ((can_push_func(e, rel->l, &mustl, 0) && mustl)))
4202 24443 : return 1;
4203 3027877 : if (is_joinop(rel->op) && can_push_func(e, rel->r, &mustr, 0) && mustr)
4204 : return 1;
4205 : }
4206 : return 0;
4207 : }
4208 :
4209 : static int
4210 84243 : exp_needs_push_down(sql_rel *rel, sql_exp *e)
4211 : {
4212 109407 : switch(e->type) {
4213 28272 : case e_cmp:
4214 : /* don't push down functions inside attribute joins */
4215 28272 : if (e->flag == cmp_or || e->flag == cmp_in || e->flag == cmp_notin || e->flag == cmp_filter || (is_join(rel->op) && is_any(e)))
4216 : return 0;
4217 27336 : return exp_needs_push_down(rel, e->l) || exp_needs_push_down(rel, e->r) || (e->f && exp_needs_push_down(rel, e->f));
4218 25164 : case e_convert:
4219 25164 : return exp_needs_push_down(rel, e->l);
4220 1918 : case e_aggr:
4221 : case e_func:
4222 1918 : if (!e->l || exps_are_atoms(e->l))
4223 20 : return 0;
4224 : return 1;
4225 1455 : case e_atom:
4226 1455 : if (!e->f || exps_are_atoms(e->f))
4227 1455 : return 0;
4228 : return 1;
4229 : case e_column:
4230 : default:
4231 : return 0;
4232 : }
4233 : }
4234 :
4235 : static int
4236 24443 : exps_need_push_down(sql_rel *rel, list *exps )
4237 : {
4238 50809 : for(node *n = exps->h; n; n = n->next)
4239 28264 : if (exp_needs_push_down(rel, n->data))
4240 : return 1;
4241 : return 0;
4242 : }
4243 :
4244 : static sql_exp *exp_push_single_func_down(visitor *v, sql_rel *rel, sql_rel *ol, sql_rel *or, sql_exp *e, int depth);
4245 :
4246 : static list *
4247 2410 : exps_push_single_func_down(visitor *v, sql_rel *rel, sql_rel *ol, sql_rel *or, list *exps, int depth)
4248 : {
4249 4820 : if (mvc_highwater(v->sql))
4250 : return exps;
4251 :
4252 6710 : for (node *n = exps->h; n; n = n->next)
4253 4300 : if ((n->data = exp_push_single_func_down(v, rel, ol, or, n->data, depth)) == NULL)
4254 : return NULL;
4255 : return exps;
4256 : }
4257 :
4258 : static sql_exp *
4259 15703 : exp_push_single_func_down(visitor *v, sql_rel *rel, sql_rel *ol, sql_rel *or, sql_exp *e, int depth)
4260 : {
4261 27450 : if (mvc_highwater(v->sql))
4262 : return e;
4263 :
4264 15703 : switch(e->type) {
4265 4237 : case e_cmp: {
4266 4237 : if (e->flag == cmp_or || e->flag == cmp_filter) {
4267 247 : if ((e->l = exps_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4268 : return NULL;
4269 247 : if ((e->r = exps_push_single_func_down(v, rel, ol, or, e->r, depth + 1)) == NULL)
4270 : return NULL;
4271 3990 : } else if (e->flag == cmp_in || e->flag == cmp_notin) {
4272 18 : if ((e->l = exp_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4273 : return NULL;
4274 18 : if ((e->r = exps_push_single_func_down(v, rel, ol, or, e->r, depth + 1)) == NULL)
4275 : return NULL;
4276 : } else {
4277 3972 : if ((e->l = exp_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4278 : return NULL;
4279 3972 : if ((e->r = exp_push_single_func_down(v, rel, ol, or, e->r, depth + 1)) == NULL)
4280 : return NULL;
4281 3972 : if (e->f && (e->f = exp_push_single_func_down(v, rel, ol, or, e->f, depth + 1)) == NULL)
4282 : return NULL;
4283 : }
4284 : } break;
4285 2006 : case e_convert:
4286 2006 : if ((e->l = exp_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4287 : return NULL;
4288 : break;
4289 3979 : case e_aggr:
4290 : case e_func: {
4291 3979 : sql_rel *l = rel->l, *r = rel->r;
4292 3979 : int must = 0, mustl = 0, mustr = 0;
4293 :
4294 3979 : if (exp_unsafe(e, false, false))
4295 23 : return e;
4296 3979 : if (!e->l || exps_are_atoms(e->l))
4297 23 : return e;
4298 3956 : if ((is_joinop(rel->op) && ((can_push_func(e, l, &mustl, depth + 1) && mustl) || (can_push_func(e, r, &mustr, depth + 1) && mustr))) ||
4299 2971 : (is_select(rel->op) && can_push_func(e, l, &must, depth + 1) && must)) {
4300 3943 : exp_label(v->sql->sa, e, ++v->sql->label);
4301 : /* we need a full projection, group by's and unions cannot be extended with more expressions */
4302 3943 : if (mustr) {
4303 353 : if (r == or) /* don't project twice */
4304 330 : rel->r = r = rel_project(v->sql->sa, r, rel_projections(v->sql, r, NULL, 1, 1));
4305 353 : list_append(r->exps, e);
4306 : } else {
4307 3590 : if (l == ol) /* don't project twice */
4308 1834 : rel->l = l = rel_project(v->sql->sa, l, rel_projections(v->sql, l, NULL, 1, 1));
4309 3590 : list_append(l->exps, e);
4310 : }
4311 3943 : e = exp_ref(v->sql, e);
4312 3943 : v->changes++;
4313 : }
4314 3956 : } break;
4315 1144 : case e_atom: {
4316 1144 : if (e->f && (e->f = exps_push_single_func_down(v, rel, ol, or, e->f, depth + 1)) == NULL)
4317 : return NULL;
4318 : } break;
4319 : case e_column:
4320 : case e_psm:
4321 : break;
4322 : }
4323 : return e;
4324 : }
4325 :
4326 : static inline sql_rel *
4327 3613984 : rel_push_func_down(visitor *v, sql_rel *rel)
4328 : {
4329 3613984 : if ((is_select(rel->op) || is_joinop(rel->op)) && rel->l && rel->exps && !(rel_is_ref(rel))) {
4330 1089100 : int changes = v->changes;
4331 1089100 : sql_rel *l = rel->l, *r = rel->r;
4332 :
4333 : /* only push down when is useful */
4334 1089100 : if ((is_select(rel->op) && list_length(rel->exps) <= 1) || rel_is_ref(l) || (is_joinop(rel->op) && rel_is_ref(r)))
4335 533234 : return rel;
4336 555866 : if (exps_can_push_func(rel->exps, rel) && exps_need_push_down(rel, rel->exps) && !exps_push_single_func_down(v, rel, l, r, rel->exps, 0))
4337 : return NULL;
4338 555866 : if (v->changes > changes) /* once we get a better join order, we can try to remove this projection */
4339 1898 : return rel_project(v->sql->sa, rel, rel_projections(v->sql, rel, NULL, 1, 1));
4340 : }
4341 3078852 : if (is_simple_project(rel->op) && rel->l && rel->exps) {
4342 1143798 : sql_rel *pl = rel->l;
4343 :
4344 1143798 : if (is_joinop(pl->op) && exps_can_push_func(rel->exps, rel)) {
4345 0 : sql_rel *l = pl->l, *r = pl->r, *ol = l, *or = r;
4346 :
4347 0 : for (node *n = rel->exps->h; n; ) {
4348 0 : node *next = n->next;
4349 0 : sql_exp *e = n->data;
4350 0 : int mustl = 0, mustr = 0;
4351 :
4352 0 : if ((can_push_func(e, l, &mustl, 0) && mustl) || (can_push_func(e, r, &mustr, 0) && mustr)) {
4353 0 : if (mustl) {
4354 0 : if (l == ol) /* don't project twice */
4355 0 : pl->l = l = rel_project(v->sql->sa, l, rel_projections(v->sql, l, NULL, 1, 1));
4356 0 : list_append(l->exps, e);
4357 0 : list_remove_node(rel->exps, NULL, n);
4358 0 : v->changes++;
4359 : } else {
4360 0 : if (r == or) /* don't project twice */
4361 0 : pl->r = r = rel_project(v->sql->sa, r, rel_projections(v->sql, r, NULL, 1, 1));
4362 0 : list_append(r->exps, e);
4363 0 : list_remove_node(rel->exps, NULL, n);
4364 0 : v->changes++;
4365 : }
4366 : }
4367 0 : n = next;
4368 : }
4369 : }
4370 : }
4371 : return rel;
4372 : }
4373 :
4374 : static sql_rel *
4375 3613985 : rel_push_func_and_select_down_(visitor *v, sql_rel *rel)
4376 : {
4377 3613985 : if (rel)
4378 3613985 : rel = rel_push_func_down(v, rel);
4379 3613985 : if (rel)
4380 3613985 : rel = rel_push_select_down(v, rel);
4381 3613985 : return rel;
4382 : }
4383 :
4384 : static sql_rel *
4385 129189 : rel_push_func_and_select_down(visitor *v, global_props *gp, sql_rel *rel)
4386 : {
4387 129189 : (void) gp;
4388 129189 : return rel_visitor_topdown(v, rel, &rel_push_func_and_select_down_);
4389 : }
4390 :
4391 : run_optimizer
4392 629324 : bind_push_func_and_select_down(visitor *v, global_props *gp)
4393 : {
4394 629324 : int flag = v->sql->sql_optimizer;
4395 629127 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
4396 543519 : || gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti] || gp->cnt[op_select])
4397 758066 : && (flag & push_func_and_select_down) ? rel_push_func_and_select_down : NULL;
4398 : }
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