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 216354 : select_split_exp(mvc *sql, sql_exp *e, sql_rel *rel)
25 : {
26 216354 : switch(e->type) {
27 : case e_column:
28 : return e;
29 6858 : case e_convert:
30 6858 : e->l = select_split_exp(sql, e->l, rel);
31 6858 : return e;
32 24423 : case e_aggr:
33 : case e_func:
34 24423 : if (!is_analytic(e) && !exp_has_sideeffect(e)) {
35 24418 : sql_subfunc *f = e->f;
36 24418 : if (e->type == e_func && !f->func->s && is_caselike_func(f) /*is_ifthenelse_func(f)*/)
37 280 : return add_exp_too_project(sql, e, rel);
38 : }
39 : return e;
40 73845 : case e_cmp:
41 73845 : if (e->flag == cmp_or || e->flag == cmp_filter) {
42 18454 : select_split_exps(sql, e->l, rel);
43 18454 : select_split_exps(sql, e->r, rel);
44 55391 : } else if (e->flag == cmp_in || e->flag == cmp_notin) {
45 3238 : e->l = select_split_exp(sql, e->l, rel);
46 3238 : select_split_exps(sql, e->r, rel);
47 : } else {
48 52153 : e->l = select_split_exp(sql, e->l, rel);
49 52153 : e->r = select_split_exp(sql, e->r, rel);
50 52153 : 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 64522 : select_split_exps(mvc *sql, list *exps, sql_rel *rel)
63 : {
64 64522 : node *n;
65 :
66 64522 : if (!exps)
67 : return;
68 162884 : for(n=exps->h; n; n = n->next){
69 98362 : sql_exp *e = n->data;
70 :
71 98362 : e = select_split_exp(sql, e, rel);
72 98362 : n->data = e;
73 : }
74 : }
75 :
76 : static sql_rel *
77 1590941 : rel_split_select_(visitor *v, sql_rel *rel)
78 : {
79 1590941 : if (!rel || !is_select(rel->op) || list_empty(rel->exps) || !rel->l || mvc_highwater(v->sql))
80 1381217 : return rel;
81 :
82 209724 : bool funcs = false;
83 :
84 : /* are there functions */
85 449138 : for (node *n = rel->exps->h; n && !funcs; n = n->next)
86 239414 : funcs = exp_has_func(n->data);
87 :
88 : /* introduce extra project */
89 209724 : if (funcs) {
90 24376 : sql_rel *nrel = rel_project(v->sql->sa, rel->l,
91 24376 : rel_projections(v->sql, rel->l, NULL, 1, 1));
92 24376 : if (!nrel || !nrel->exps)
93 : return NULL;
94 24376 : rel->l = nrel;
95 : /* recursively split all functions and add those to the projection list */
96 24376 : select_split_exps(v->sql, rel->exps, nrel);
97 24376 : return rel;
98 : }
99 : return rel;
100 : }
101 :
102 : static sql_rel *
103 50331 : rel_split_select(visitor *v, global_props *gp, sql_rel *rel)
104 : {
105 50331 : (void) gp;
106 50331 : return rel_visitor_bottomup(v, rel, &rel_split_select_);
107 : }
108 :
109 : run_optimizer
110 612289 : bind_split_select(visitor *v, global_props *gp)
111 : {
112 612289 : int flag = v->sql->sql_optimizer;
113 541838 : return gp->opt_cycle == 0 && gp->opt_level == 1 && (flag & split_select)
114 1154119 : && 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 1411926 : rel_remove_redundant_join_(visitor *v, sql_rel *rel)
127 : {
128 1411926 : if ((is_join(rel->op) || is_semi(rel->op)) && !list_empty(rel->exps)) {
129 209983 : sql_rel *l = rel->l, *r = rel->r, *b, *p = NULL, *j;
130 :
131 209983 : if (is_basetable(l->op) && is_simple_project(r->op) && need_distinct(r)) {
132 9 : b = l;
133 9 : p = r;
134 9 : j = p->l;
135 209974 : } 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 209983 : 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 44324 : rel_remove_redundant_join(visitor *v, global_props *gp, sql_rel *rel)
171 : {
172 44324 : (void) gp;
173 44324 : 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 612289 : bind_remove_redundant_join(visitor *v, global_props *gp)
178 : {
179 612289 : int flag = v->sql->sql_optimizer;
180 541838 : return gp->opt_cycle == 0 && gp->opt_level == 1 && (gp->cnt[op_left] || gp->cnt[op_right]
181 524582 : || gp->cnt[op_full] || gp->cnt[op_join] || gp->cnt[op_semi] || gp->cnt[op_anti]) &&
182 656613 : (flag & remove_redundant_join) ? rel_remove_redundant_join : NULL;
183 : }
184 :
185 :
186 : static list *
187 1064615 : exp_merge_range(visitor *v, sql_rel *rel, list *exps)
188 : {
189 1064615 : node *n, *m;
190 2290909 : for (n=exps->h; n; n = n->next) {
191 1228187 : sql_exp *e = n->data;
192 1228187 : sql_exp *le = e->l;
193 1228187 : sql_exp *re = e->r;
194 :
195 : /* handle the and's in the or lists */
196 1228187 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e)) {
197 42555 : e->l = exp_merge_range(v, rel, e->l);
198 42555 : e->r = exp_merge_range(v, rel, e->r);
199 : /* only look for gt, gte, lte, lt */
200 1185632 : } else if (n->next &&
201 159418 : e->type == e_cmp && e->flag < cmp_equal && !e->f &&
202 6730 : re->card == CARD_ATOM && !is_anti(e)) {
203 1092 : for (m=n->next; m; m = m->next) {
204 689 : sql_exp *f = m->data;
205 689 : sql_exp *lf = f->l;
206 689 : sql_exp *rf = f->r;
207 689 : int c_le = is_numeric_upcast(le), c_lf = is_numeric_upcast(lf);
208 :
209 689 : if (f->type == e_cmp && f->flag < cmp_equal && !f->f &&
210 645 : rf->card == CARD_ATOM && !is_anti(f) &&
211 322 : exp_match_exp(c_le?le->l:le, c_lf?lf->l:lf)) {
212 172 : sql_exp *ne;
213 172 : int swap = 0, lt = 0, gt = 0;
214 172 : sql_subtype super;
215 : /* for now only c1 <[=] x <[=] c2 */
216 :
217 172 : swap = lt = (e->flag == cmp_lt || e->flag == cmp_lte);
218 172 : gt = !lt;
219 :
220 172 : if (gt &&
221 150 : (f->flag == cmp_gt ||
222 : f->flag == cmp_gte))
223 32 : continue;
224 22 : if (lt &&
225 22 : (f->flag == cmp_lt ||
226 : f->flag == cmp_lte))
227 0 : continue;
228 :
229 140 : cmp_supertype(&super, exp_subtype(le), exp_subtype(lf));
230 140 : if (!(rf = exp_check_type(v->sql, &super, rel, rf, type_equal)) ||
231 140 : !(le = exp_check_type(v->sql, &super, rel, le, type_equal)) ||
232 140 : !(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 : }
237 140 : if (!swap)
238 118 : ne = exp_compare2(v->sql->sa, le, re, rf, compare2range(e->flag, f->flag), 0);
239 : else
240 22 : ne = exp_compare2(v->sql->sa, le, rf, re, compare2range(f->flag, e->flag), 0);
241 :
242 140 : list_remove_data(exps, NULL, e);
243 140 : list_remove_data(exps, NULL, f);
244 140 : list_append(exps, ne);
245 140 : v->changes++;
246 140 : return exp_merge_range(v, rel, exps);
247 : }
248 : }
249 1185089 : } else if (n->next &&
250 158875 : 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 38981 : exps_cse( mvc *sql, list *oexps, list *l, list *r )
337 : {
338 38981 : list *nexps;
339 38981 : node *n, *m;
340 38981 : char *lu, *ru;
341 38981 : int lc = 0, rc = 0, match = 0, res = 0;
342 :
343 38981 : if (list_length(l) == 0 || list_length(r) == 0)
344 0 : return 0;
345 :
346 : /* first recursive exps_cse */
347 38981 : nexps = new_exp_list(sql->sa);
348 81753 : for (n = l->h; n; n = n->next) {
349 42772 : sql_exp *e = n->data;
350 :
351 42772 : 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 27665 : append(nexps, e);
355 : }
356 : }
357 38981 : l = nexps;
358 :
359 38981 : nexps = new_exp_list(sql->sa);
360 84897 : for (n = r->h; n; n = n->next) {
361 45916 : sql_exp *e = n->data;
362 :
363 45916 : 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 43774 : append(nexps, e);
367 : }
368 : }
369 38981 : r = nexps;
370 :
371 : /* simplify true or .. and .. or true */
372 38981 : if (list_length(l) == list_length(r) && list_length(l) == 1) {
373 34506 : sql_exp *le = l->h->data, *re = r->h->data;
374 :
375 34506 : if (exp_is_true(le)) {
376 14 : append(oexps, le);
377 14 : return 1;
378 : }
379 34492 : if (exp_is_true(re)) {
380 5 : append(oexps, re);
381 5 : return 1;
382 : }
383 : }
384 :
385 38962 : lu = SA_ZNEW_ARRAY(sql->ta, char, list_length(l));
386 38962 : ru = SA_ZNEW_ARRAY(sql->ta, char, list_length(r));
387 81732 : for (n = l->h, lc = 0; n; n = n->next, lc++) {
388 42770 : sql_exp *le = n->data;
389 :
390 94471 : for ( m = r->h, rc = 0; m; m = m->next, rc++) {
391 51701 : sql_exp *re = m->data;
392 :
393 51701 : 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 38962 : 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 38913 : 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 23332 : exp_col_key(sql_exp *e)
428 : {
429 17591 : 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 4282 : detect_col_cmp_eqs(mvc *sql, list *eqs, sql_hash *eqh)
469 : {
470 4282 : bool col_multivalue_cmp_eq = false;
471 16084 : for (node *n = eqs->h; n; n = n->next ) {
472 11802 : sql_exp *e = n->data;
473 11802 : 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 11802 : bool found = false;
477 :
478 11802 : int key = eqh->key(le);
479 11802 : sql_hash_e *he = eqh->buckets[key&(eqh->size-1)];
480 :
481 14698 : 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 11802 : if (!found) {
496 8906 : eq_cv *cv = SA_NEW(sql->sa, eq_cv);
497 8906 : cv->first = e;
498 8906 : cv->vs = sa_list(sql->sa);
499 8906 : cv->vs = append(cv->vs, re);
500 8906 : cv->col = le;
501 :
502 8906 : hash_add(eqh, key, cv);
503 : }
504 : }
505 4282 : 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 64707 : 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 84100 : bool eq_only = true;
595 179650 : for (node *n = exps->h; n && eq_only; n = n->next) {
596 95550 : sql_exp *e = n->data;
597 95550 : sql_exp *le = e->l, *re = e->r;
598 190849 : eq_only &= (e->type == e_cmp && e->flag == cmp_equal &&
599 33246 : le->card != CARD_ATOM && is_column(le->type) &&
600 127666 : re->card == CARD_ATOM && !is_semantics(e));
601 : }
602 :
603 84100 : if (list_length(exps) > 1) {
604 5338 : if (eq_only)
605 4520 : *mce_ands = append(*mce_ands, exps);
606 : else
607 818 : *gen_ands = append(*gen_ands, exps);
608 78762 : } else if (list_length(exps) == 1) {
609 78762 : sql_exp *se = exps->h->data;
610 78762 : sql_exp *le = se->l, *re = se->r;
611 :
612 78762 : 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 59369 : } else if (eq_only) {
618 14896 : *eqs = append(*eqs, se);
619 : } else {
620 44473 : *noneq = append(*noneq, se);
621 : }
622 : }
623 64707 : }
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 496295 : merge_ors(mvc *sql, list *exps, int *changes)
673 : {
674 496295 : sql_hash *eqh = NULL, *meqh = NULL;
675 496295 : list *eqs = NULL, *neq = NULL, *gen_ands = NULL, *mce_ands = NULL, *ins = NULL, *mins = NULL;
676 1068336 : for (node *n = exps->h; n; n = n->next) {
677 572041 : sql_exp *e = n->data;
678 :
679 572041 : 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 22657 : gen_ands = new_exp_list(sql->sa);
691 22657 : mce_ands = new_exp_list(sql->sa);
692 22657 : eqs = new_exp_list(sql->sa);
693 22657 : neq = new_exp_list(sql->sa);
694 :
695 : /* walk the OR tree */
696 22657 : exp_or_chain_groups(sql, e->l, &gen_ands, &mce_ands, &eqs, &neq);
697 22657 : exp_or_chain_groups(sql, e->r, &gen_ands, &mce_ands, &eqs, &neq);
698 :
699 : /* detect col cmp_eq exps with multiple values */
700 22657 : bool col_multival = false;
701 22657 : if (list_length(eqs) > 1) {
702 4282 : eqh = hash_new(sql->sa, 32, (fkeyvalue)&exp_col_key);
703 4282 : col_multival = detect_col_cmp_eqs(sql, eqs, eqh);
704 : }
705 :
706 : /* detect mutli-col cmp_eq exps with multiple (lists of) values */
707 22657 : bool multicol_multival = false;
708 22657 : 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 22657 : if (!col_multival && !multicol_multival)
714 20900 : 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 496295 : 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 574223 : merge_notequal(mvc *sql, list *exps, int *changes)
793 : {
794 574223 : list *inequality_groups = NULL, *nexps = NULL;
795 574223 : int needed = 0;
796 :
797 1234478 : for (node *n = exps->h; n; n = n->next) {
798 660255 : sql_exp *e = n->data;
799 :
800 660255 : if (TRIVIAL_NOT_EQUAL_CMP(e)) {
801 80001 : bool appended = false;
802 :
803 80001 : if (inequality_groups) {
804 9027 : for (node *m = inequality_groups->h; m && !appended; m = m->next) {
805 5178 : list *next = m->data;
806 5178 : sql_exp *first = (sql_exp*) next->h->data;
807 :
808 5178 : if (exp_match(first->l, e->l)) {
809 1132 : list_append(next, e);
810 1132 : appended = true;
811 : }
812 : }
813 : }
814 3849 : if (!appended) {
815 78869 : if (!inequality_groups)
816 76152 : inequality_groups = new_exp_list(sql->sa);
817 78869 : list_append(inequality_groups, list_append(new_exp_list(sql->sa), e));
818 : }
819 : }
820 : }
821 :
822 574223 : if (inequality_groups) { /* if one list of inequalities has more than one entry, then the re-write is needed */
823 155021 : for (node *n = inequality_groups->h; n; n = n->next) {
824 78869 : list *next = n->data;
825 :
826 78869 : if (list_length(next) > 1)
827 1047 : needed = 1;
828 : }
829 : }
830 :
831 76152 : if (needed) {
832 965 : nexps = new_exp_list(sql->sa);
833 2546 : for (node *n = inequality_groups->h; n; n = n->next) {
834 1581 : list *next = n->data;
835 1581 : sql_exp *first = (sql_exp*) next->h->data;
836 :
837 1581 : if (list_length(next) > 1) {
838 1047 : list *notin = new_exp_list(sql->sa);
839 :
840 3226 : for (node *m = next->h; m; m = m->next) {
841 2179 : sql_exp *e = m->data;
842 2179 : list_append(notin, e->r);
843 : }
844 1047 : list_append(nexps, exp_in(sql->sa, first->l, notin, cmp_notin));
845 : } else {
846 534 : list_append(nexps, first);
847 : }
848 : }
849 :
850 4036 : for (node *n = exps->h; n; n = n->next) {
851 3071 : sql_exp *e = n->data;
852 :
853 3071 : if (!TRIVIAL_NOT_EQUAL_CMP(e))
854 358 : list_append(nexps, e);
855 : }
856 965 : (*changes)++;
857 : } else {
858 : nexps = exps;
859 : }
860 :
861 1233346 : for (node *n = nexps->h; n ; n = n->next) {
862 659123 : sql_exp *e = n->data;
863 :
864 659123 : if (e->type == e_cmp && e->flag == cmp_or) {
865 38964 : e->l = merge_notequal(sql, e->l, changes);
866 38964 : e->r = merge_notequal(sql, e->r, changes);
867 : }
868 : }
869 :
870 574223 : return nexps;
871 : }
872 :
873 : int
874 160960 : is_numeric_upcast(sql_exp *e)
875 : {
876 160960 : if (is_convert(e->type)) {
877 4651 : sql_subtype *f = exp_fromtype(e);
878 4651 : sql_subtype *t = exp_totype(e);
879 :
880 4651 : 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 43490 : try_rewrite_equal_or_is_null(mvc *sql, sql_rel *rel, sql_exp *or, list *l1, list *l2)
891 : {
892 43490 : if (list_length(l1) == 1) {
893 40191 : bool valid = true, first_is_null_found = false, second_is_null_found = false;
894 40191 : sql_exp *cmp = l1->h->data;
895 40191 : sql_exp *first = cmp->l, *second = cmp->r;
896 :
897 40191 : if (is_compare(cmp->type) && !is_anti(cmp) && !cmp->f && cmp->flag == cmp_equal) {
898 6101 : int fupcast = is_numeric_upcast(first), supcast = is_numeric_upcast(second);
899 12218 : for(node *n = l2->h ; n && valid; n = n->next) {
900 6117 : sql_exp *e = n->data, *l = e->l, *r = e->r;
901 :
902 6117 : if (is_compare(e->type) && e->flag == cmp_equal && !e->f &&
903 3083 : !is_anti(e) && is_semantics(e)) {
904 826 : int lupcast = is_numeric_upcast(l);
905 826 : int rupcast = is_numeric_upcast(r);
906 826 : sql_exp *rr = rupcast ? r->l : r;
907 :
908 826 : if (rr->type == e_atom && rr->l && atom_null(rr->l)) {
909 826 : if (exp_match_exp(fupcast?first->l:first, lupcast?l->l:l))
910 : first_is_null_found = true;
911 104 : else if (exp_match_exp(supcast?second->l:second, lupcast?l->l:l))
912 : second_is_null_found = true;
913 : else
914 5379 : valid = false;
915 : } else {
916 : valid = false;
917 : }
918 : } else {
919 : valid = false;
920 : }
921 : }
922 6101 : if (valid && first_is_null_found && second_is_null_found) {
923 13 : sql_subtype super;
924 :
925 13 : cmp_supertype(&super, exp_subtype(first), exp_subtype(second)); /* first and second must have the same type */
926 13 : if (!(first = exp_check_type(sql, &super, rel, first, type_equal)) ||
927 13 : !(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 13 : sql_exp *res = exp_compare(sql->sa, first, second, cmp->flag);
933 13 : set_semantics(res);
934 13 : if (exp_name(or))
935 0 : exp_prop_alias(sql->sa, res, or);
936 13 : return res;
937 : }
938 : }
939 : }
940 : return or;
941 : }
942 :
943 : static list *
944 977612 : merge_cmp_or_null(mvc *sql, sql_rel *rel, list *exps, int *changes)
945 : {
946 2105226 : for (node *n = exps->h; n ; n = n->next) {
947 1127614 : sql_exp *e = n->data;
948 :
949 1127614 : if (is_compare(e->type) && e->flag == cmp_or && !is_anti(e)) {
950 21745 : sql_exp *ne = try_rewrite_equal_or_is_null(sql, rel, e, e->l, e->r);
951 21745 : if (ne != e) {
952 11 : (*changes)++;
953 11 : n->data = ne;
954 : }
955 21745 : ne = try_rewrite_equal_or_is_null(sql, rel, e, e->r, e->l);
956 21745 : if (ne != e) {
957 2 : (*changes)++;
958 2 : n->data = ne;
959 : }
960 : }
961 : }
962 977612 : return exps;
963 : }
964 :
965 : static list *
966 977612 : cleanup_equal_exps(mvc *sql, sql_rel *rel, list *exps, int *changes)
967 : {
968 977612 : if (list_length(exps) <= 1)
969 : return exps;
970 137141 : if (is_join(rel->op)) {
971 207899 : for(node *n = exps->h; n; n = n->next) {
972 139769 : sql_exp *e = n->data;
973 279369 : if (e->type == e_cmp && !e->f && e->flag <= cmp_notequal &&
974 179335 : !rel_find_exp(rel->l, e->l) && !rel_find_exp(rel->r, e->r) &&
975 39561 : !find_prop(e->p, PROP_HASHCOL) && !find_prop(e->p, PROP_JOINIDX)) {
976 19700 : exp_swap(e);
977 : }
978 : }
979 : }
980 137141 : bool needed = false;
981 425308 : for(node *n = exps->h; !needed && n; n = n->next) {
982 573831 : for (node *m = n->next; !needed && m; m = m->next) {
983 285664 : if (exp_match_exp_semantics(n->data, m->data, true))
984 89 : needed = true;
985 : }
986 : }
987 137141 : 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 977612 : rel_select_cse(visitor *v, sql_rel *rel)
1018 : {
1019 977612 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps) /* cleanup equal expressions */
1020 977612 : rel->exps = cleanup_equal_exps(v->sql, rel, rel->exps, &v->changes); /* (a = b) and (a += b) */
1021 :
1022 977612 : if (is_select(rel->op) && rel->exps)
1023 496295 : rel->exps = merge_ors(v->sql, rel->exps, &v->changes);
1024 :
1025 977612 : if (is_select(rel->op) && rel->exps)
1026 496295 : rel->exps = merge_notequal(v->sql, rel->exps, &v->changes); /* x <> 1 and x <> 2 => x not in (1, 2)*/
1027 :
1028 977612 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps)
1029 977612 : 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 977612 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps) {
1032 977612 : node *n;
1033 977612 : list *nexps;
1034 977612 : int needed = 0;
1035 :
1036 2098657 : for (n=rel->exps->h; n && !needed; n = n->next) {
1037 1121045 : sql_exp *e = n->data;
1038 :
1039 1121045 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e))
1040 1121045 : needed = 1;
1041 : }
1042 977612 : if (!needed)
1043 : return rel;
1044 20923 : nexps = new_exp_list(v->sql->sa);
1045 49743 : for (n=rel->exps->h; n; n = n->next) {
1046 28820 : sql_exp *e = n->data;
1047 :
1048 28820 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e)) {
1049 : /* split the common expressions */
1050 21732 : v->changes += exps_cse(v->sql, nexps, e->l, e->r);
1051 : } else {
1052 7088 : append(nexps, e);
1053 : }
1054 : }
1055 20923 : rel->exps = nexps;
1056 : }
1057 : return rel;
1058 : }
1059 :
1060 : static list *
1061 13412 : exps_merge_select_rse( mvc *sql, list *l, list *r, bool *merged)
1062 : {
1063 13412 : node *n, *m, *o;
1064 13412 : list *nexps = NULL, *lexps, *rexps;
1065 13412 : bool lmerged = true, rmerged = true;
1066 :
1067 13412 : lexps = new_exp_list(sql->sa);
1068 28198 : for (n = l->h; n; n = n->next) {
1069 14786 : sql_exp *e = n->data;
1070 :
1071 14786 : 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 9544 : append(lexps, e);
1078 : }
1079 : }
1080 13412 : if (lmerged)
1081 8219 : lmerged = (list_length(lexps) == 1);
1082 13412 : rexps = new_exp_list(sql->sa);
1083 29204 : for (n = r->h; n; n = n->next) {
1084 15792 : sql_exp *e = n->data;
1085 :
1086 15792 : 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 15093 : append(rexps, e);
1093 : }
1094 : }
1095 13412 : if (rmerged)
1096 12734 : rmerged = (list_length(r) == 1);
1097 :
1098 13412 : nexps = new_exp_list(sql->sa);
1099 :
1100 : /* merge merged lists first ? */
1101 23358 : for (n = lexps->h; n; n = n->next) {
1102 9946 : sql_exp *le = n->data, *re, *fnd = NULL;
1103 :
1104 9946 : if (le->type != e_cmp || le->flag == cmp_or || is_anti(le) || is_semantics(le) || is_symmetric(le))
1105 443 : continue;
1106 19601 : for (m = rexps->h; !fnd && m; m = m->next) {
1107 10098 : re = m->data;
1108 10098 : if (exps_match_col_exps(le, re))
1109 1532 : fnd = re;
1110 : }
1111 9503 : 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 1482 : if (fnd) {
1121 1482 : re = fnd;
1122 1482 : fnd = NULL;
1123 1482 : if (is_anti(le) || is_anti(re) || is_symmetric(re))
1124 0 : continue;
1125 1919 : 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 1188 : } 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 1197 : } 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 722 : } 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 492 : } 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 13412 : 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 380712 : rel_merge_select_rse(visitor *v, sql_rel *rel)
1194 : {
1195 : /* only execute once per select */
1196 380712 : if ((is_select(rel->op) || is_join(rel->op) || is_semi(rel->op)) && rel->exps && !is_rel_merge_select_rse_used(rel->used)) {
1197 126141 : node *n, *o;
1198 126141 : list *nexps = new_exp_list(v->sql->sa);
1199 :
1200 270479 : for (n=rel->exps->h; n; n = n->next) {
1201 144338 : sql_exp *e = n->data;
1202 :
1203 151809 : if (e->type == e_cmp && e->flag == cmp_or && !is_anti(e) && !is_semantics(e)) {
1204 : /* possibly merge related expressions */
1205 7471 : bool merged = false;
1206 :
1207 7471 : list *ps = exps_merge_select_rse(v->sql, e->l, e->r, &merged);
1208 8054 : for (o = ps->h; o; o = o->next)
1209 583 : append(nexps, o->data);
1210 7471 : if (merged)
1211 87 : v->changes++;
1212 : else
1213 7384 : append(nexps, e);
1214 : } else {
1215 136867 : append(nexps, e);
1216 : }
1217 : }
1218 126141 : rel->exps = nexps;
1219 126141 : rel->used |= rel_merge_select_rse_used;
1220 : }
1221 380712 : return rel;
1222 : }
1223 :
1224 : /* pack optimizers into a single function call to avoid iterations in the AST */
1225 : static sql_rel *
1226 3430962 : rel_optimize_select_and_joins_bottomup_(visitor *v, sql_rel *rel)
1227 : {
1228 3430962 : if (!rel || (!is_join(rel->op) && !is_semi(rel->op) && !is_select(rel->op)) || list_empty(rel->exps))
1229 2453350 : return rel;
1230 977612 : uint8_t cycle = *(uint8_t*) v->data;
1231 :
1232 977612 : rel->exps = exp_merge_range(v, rel, rel->exps);
1233 977612 : rel = rel_select_cse(v, rel);
1234 977612 : if (cycle == 1)
1235 380712 : rel = rel_merge_select_rse(v, rel);
1236 977612 : rel = rewrite_simplify(v, cycle, v->value_based_opt, rel);
1237 977612 : return rel;
1238 : }
1239 :
1240 : static sql_rel *
1241 114893 : rel_optimize_select_and_joins_bottomup(visitor *v, global_props *gp, sql_rel *rel)
1242 : {
1243 114893 : v->data = &gp->opt_cycle;
1244 114893 : rel = rel_visitor_bottomup(v, rel, &rel_optimize_select_and_joins_bottomup_);
1245 114893 : v->data = gp;
1246 114893 : return rel;
1247 : }
1248 :
1249 : run_optimizer
1250 612285 : bind_optimize_select_and_joins_bottomup(visitor *v, global_props *gp)
1251 : {
1252 612285 : int flag = v->sql->sql_optimizer;
1253 612090 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right] ||
1254 534583 : gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti] ||
1255 1224375 : 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 3250280 : 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 3250280 : if ((is_innerjoin(rel->op) || is_left(rel->op) || is_right(rel->op) /*|| is_semi(rel->op)*/) && !list_empty(rel->exps)) {
1265 456525 : int left = is_innerjoin(rel->op) || is_right(rel->op) || rel->op == op_semi;
1266 456525 : int right = is_innerjoin(rel->op) || is_left(rel->op) || is_semi(rel->op);
1267 456525 : sql_rel *jl = rel->l, *ojl = jl, *jr = rel->r, *ojr = jr;
1268 :
1269 456525 : set_processed(jl);
1270 456525 : set_processed(jr);
1271 984598 : for (node *n = rel->exps->h; n;) {
1272 528073 : node *next = n->next;
1273 528073 : sql_exp *e = n->data;
1274 :
1275 528073 : if (left && rel_rebind_exp(v->sql, jl, e) && !is_any(e)) { /* select expressions on left */
1276 1335 : if (!is_select(jl->op) || rel_is_ref(jl))
1277 1325 : rel->l = jl = rel_select(v->sql->sa, jl, NULL);
1278 1335 : rel_select_add_exp(v->sql->sa, jl, e);
1279 1335 : list_remove_node(rel->exps, NULL, n);
1280 1335 : v->changes++;
1281 526738 : } else if (right && rel_rebind_exp(v->sql, jr, e) && !is_any(e)) { /* select expressions on right */
1282 42 : if (!is_select(jr->op) || rel_is_ref(jr))
1283 40 : rel->r = jr = rel_select(v->sql->sa, jr, NULL);
1284 42 : rel_select_add_exp(v->sql->sa, jr, e);
1285 42 : list_remove_node(rel->exps, NULL, n);
1286 42 : v->changes++;
1287 : }
1288 : n = next;
1289 : }
1290 456525 : if (ojl != jl)
1291 1325 : set_processed(jl);
1292 456525 : if (ojr != jr)
1293 40 : set_processed(jr);
1294 : }
1295 3250280 : return rel;
1296 : }
1297 :
1298 : static inline bool
1299 3250280 : is_non_trivial_select_applied_to_outer_join(sql_rel *rel)
1300 : {
1301 3250280 : 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 4854 : replace_column_references_with_nulls_1(mvc *sql, sql_rel *inner_join_side, list* exps) {
1311 4854 : if (list_empty(exps))
1312 : return;
1313 12412 : for(node* n = exps->h; n; n=n->next) {
1314 7558 : sql_exp* e = n->data;
1315 7558 : replace_column_references_with_nulls_2(sql, inner_join_side, e);
1316 : }
1317 : }
1318 :
1319 : static void
1320 23943 : replace_column_references_with_nulls_2(mvc *sql, sql_rel *inner_join_side, sql_exp* e) {
1321 30713 : if (e == NULL) {
1322 : return;
1323 : }
1324 :
1325 25542 : switch (e->type) {
1326 7800 : case e_column:
1327 7800 : if (rel_find_exp_and_corresponding_rel(inner_join_side, e, true, NULL, NULL)) {
1328 1853 : e->type = e_atom;
1329 1853 : e->l = atom_general(sql->sa, &e->tpe, NULL, 0);
1330 1853 : e->r = e->f = NULL;
1331 : }
1332 : break;
1333 7713 : case e_cmp:
1334 7713 : switch (e->flag) {
1335 5601 : 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 5601 : sql_exp* l = e->l;
1343 5601 : sql_exp* r = e->r;
1344 5601 : sql_exp* f = e->f;
1345 :
1346 5601 : replace_column_references_with_nulls_2(sql, inner_join_side, l);
1347 5601 : replace_column_references_with_nulls_2(sql, inner_join_side, r);
1348 5601 : replace_column_references_with_nulls_2(sql, inner_join_side, f);
1349 5601 : break;
1350 : }
1351 1577 : case cmp_filter:
1352 : case cmp_or:
1353 : {
1354 1577 : list* l = e->l;
1355 1577 : list* r = e->r;
1356 1577 : replace_column_references_with_nulls_1(sql, inner_join_side, l);
1357 1577 : replace_column_references_with_nulls_1(sql, inner_join_side, r);
1358 1577 : break;
1359 : }
1360 535 : case cmp_in:
1361 : case cmp_notin:
1362 : {
1363 535 : sql_exp* l = e->l;
1364 535 : list* r = e->r;
1365 535 : replace_column_references_with_nulls_2(sql, inner_join_side, l);
1366 535 : replace_column_references_with_nulls_1(sql, inner_join_side, r);
1367 535 : 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 1169 : case e_convert:
1380 : {
1381 1169 : sql_exp* l = e->l;
1382 1169 : replace_column_references_with_nulls_2(sql, inner_join_side, l);
1383 1169 : break;
1384 : }
1385 : default:
1386 : break;
1387 : }
1388 : }
1389 :
1390 : static sql_rel *
1391 4070 : 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 4070 : if (is_select(inner_join_side->op) && inner_join_side->l)
1395 4070 : inner_join_side = inner_join_side->l;
1396 :
1397 4070 : list* select_predicates = exps_copy(v->sql, sel->exps);
1398 :
1399 8624 : for(node* n = select_predicates->h; n; n=n->next) {
1400 4648 : sql_exp* e = n->data;
1401 4648 : replace_column_references_with_nulls_2(v->sql, inner_join_side, e);
1402 :
1403 4648 : if (exp_is_false(e)) {
1404 94 : join->op = new_type;
1405 94 : v->changes++;
1406 94 : break;
1407 : }
1408 : }
1409 :
1410 4070 : return sel;
1411 : }
1412 :
1413 : static inline sql_rel *
1414 3250280 : rel_out2inner(visitor *v, sql_rel *rel) {
1415 :
1416 3250280 : if (!is_non_trivial_select_applied_to_outer_join(rel)) {
1417 : // Nothing to do here.
1418 : return rel;
1419 : }
1420 :
1421 4048 : sql_rel* join = (sql_rel*) rel->l;
1422 :
1423 4048 : 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 4048 : sql_rel* inner_join_side;
1434 4048 : if (is_left(join->op)) {
1435 4000 : inner_join_side = join->r;
1436 4000 : 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 4179 : exps_uses_any(list *exps, list *l)
1458 : {
1459 4179 : bool uses_any = false;
1460 :
1461 4179 : if (list_empty(exps) || list_empty(l))
1462 14 : return false;
1463 8336 : for (node *n = l->h; n && !uses_any; n = n->next) {
1464 4171 : sql_exp *e = n->data;
1465 4171 : 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 670515 : find_projection_for_join2semi(sql_rel *rel)
1620 : {
1621 670515 : 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 351959 : if (rel->card < CARD_AGGR) /* const or groupby without group by exps */
1623 : return ALL_VALUES_DISTINCT;
1624 350812 : if (list_length(rel->exps) == 1) {
1625 6579 : 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 6579 : if (e->type == e_column) {
1628 6549 : sql_rel *res = NULL;
1629 6549 : sql_exp *found = NULL;
1630 6549 : 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 6549 : 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 9476 : return ALL_VALUES_DISTINCT;
1635 2926 : if (is_unique(e))
1636 2229 : return has_nil(e) ? MAY_HAVE_DUPLICATE_NULLS : ALL_VALUES_DISTINCT;
1637 :
1638 697 : if ((is_simple_project(rel->op) || is_groupby(rel->op) || is_inter(rel->op) || is_except(rel->op)) &&
1639 129 : (found = rel_find_exp_and_corresponding_rel(rel->l, e, false, &res, &underjoin)) && !underjoin) { /* grouping column on inner relation */
1640 113 : if (need_distinct(res) && list_length(res->exps) == 1)
1641 : return ALL_VALUES_DISTINCT;
1642 113 : if (is_unique(found))
1643 0 : return has_nil(e) ? MAY_HAVE_DUPLICATE_NULLS : ALL_VALUES_DISTINCT;
1644 113 : 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 2123364 : find_candidate_join2semi(visitor *v, sql_rel *rel, bool *swap)
1663 : {
1664 : /* generalize possibility : we need the visitor 'step' here */
1665 2123890 : if (rel_is_ref(rel)) /* if the join has multiple references, it's dangerous to convert it into a semijoin */
1666 : return NULL;
1667 2010878 : if (rel->op == op_join && !list_empty(rel->exps) && list_empty(rel->attr)) {
1668 337412 : sql_rel *l = rel->l, *r = rel->r;
1669 337412 : int foundr = NO_PROJECTION_FOUND, foundl = NO_PROJECTION_FOUND, found = NO_PROJECTION_FOUND;
1670 337412 : bool ok = false;
1671 :
1672 337412 : foundr = find_projection_for_join2semi(r);
1673 337412 : if (foundr < ALL_VALUES_DISTINCT)
1674 333103 : foundl = find_projection_for_join2semi(l);
1675 337412 : if (foundr && foundr > foundl) {
1676 4311 : *swap = false;
1677 4311 : found = foundr;
1678 333101 : } else if (foundl) {
1679 2681 : *swap = true;
1680 2681 : found = foundl;
1681 : }
1682 :
1683 6992 : 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 13988 : for (node *n=rel->exps->h; n && !ok; n = n->next) {
1686 6996 : sql_exp *e = n->data;
1687 :
1688 10756 : 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 3 : (found == ALL_VALUES_DISTINCT || !is_semantics(e) || !has_nil((sql_exp *)e->l) || !has_nil((sql_exp *)e->r));
1690 : }
1691 : }
1692 :
1693 337412 : if (ok)
1694 : return rel;
1695 : }
1696 2007639 : if (is_join(rel->op) || is_semi(rel->op)) {
1697 507655 : sql_rel *c;
1698 :
1699 507655 : if ((c=find_candidate_join2semi(v, rel->l, swap)) != NULL ||
1700 507269 : (c=find_candidate_join2semi(v, rel->r, swap)) != NULL)
1701 408 : if (list_empty(c->attr))
1702 : return c;
1703 : }
1704 2007231 : if (is_topn(rel->op) || is_sample(rel->op))
1705 526 : return find_candidate_join2semi(v, rel->l, swap);
1706 : return NULL;
1707 : }
1708 :
1709 : static int
1710 2479 : subrel_uses_exp_outside_subrel(sql_rel *rel, list *l, sql_rel *c)
1711 : {
1712 2480 : if (rel == c)
1713 : return 0;
1714 : /* for subrel only expect joins (later possibly selects) */
1715 817 : if (is_join(rel->op) || is_semi(rel->op)) {
1716 414 : if (exps_uses_any(rel->exps, l))
1717 : return 1;
1718 810 : if (subrel_uses_exp_outside_subrel(rel->l, l, c) ||
1719 404 : subrel_uses_exp_outside_subrel(rel->r, l, c))
1720 5 : return 1;
1721 : }
1722 804 : 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 3239 : 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 3239 : if (is_simple_project(rel->op) || is_groupby(rel->op) || is_select(rel->op)) {
1732 3239 : if (!list_empty(rel->exps) && exps_uses_any(rel->exps, l))
1733 : return 1;
1734 1669 : if ((is_simple_project(rel->op) || is_groupby(rel->op)) && !list_empty(rel->r) && exps_uses_any(rel->r, l))
1735 : return 1;
1736 1669 : if (rel->l)
1737 1669 : 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 3250280 : rel_join2semijoin(visitor *v, sql_rel *rel)
1746 : {
1747 3250280 : if ((is_simple_project(rel->op) || is_groupby(rel->op)) && rel->l) {
1748 1108440 : bool swap = false;
1749 1108440 : sql_rel *l = rel->l;
1750 1108440 : sql_rel *c = find_candidate_join2semi(v, l, &swap);
1751 :
1752 1108440 : if (c) {
1753 : /* 'p' is a project */
1754 3239 : 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 3239 : if (!rel_uses_exp_outside_subrel(rel, p->exps, c)) {
1758 1661 : c->op = op_semi;
1759 1661 : if (swap) {
1760 518 : sql_rel *tmp = c->r;
1761 518 : c->r = c->l;
1762 518 : c->l = tmp;
1763 : }
1764 1661 : v->changes++;
1765 : }
1766 : }
1767 : }
1768 3250280 : return rel;
1769 : }
1770 :
1771 : static inline sql_rel *
1772 3250280 : rel_push_join_down_outer(visitor *v, sql_rel *rel)
1773 : {
1774 3250280 : if (is_join(rel->op) && !is_outerjoin(rel->op) && !is_single(rel) && !list_empty(rel->exps) && !rel_is_ref(rel)) {
1775 345657 : sql_rel *l = rel->l, *r = rel->r;
1776 :
1777 345657 : if (is_left(r->op) && (is_select(l->op) || (is_join(l->op) && !is_outerjoin(l->op))) && !rel_is_ref(l) &&
1778 526 : !rel_is_ref(r)) {
1779 526 : sql_rel *rl = r->l;
1780 526 : sql_rel *rr = r->r;
1781 526 : if (rel_is_ref(rl) || rel_is_ref(rr))
1782 : return rel;
1783 : /* join exps should only include l and r.l */
1784 526 : list *njexps = sa_list(v->sql->sa);
1785 1052 : for(node *n = rel->exps->h; n; n = n->next) {
1786 526 : sql_exp *je = n->data;
1787 :
1788 526 : assert(je->type == e_cmp);
1789 526 : if (je->f)
1790 : return rel;
1791 526 : 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 526 : list_append(njexps, je);
1793 : } else {
1794 0 : return rel;
1795 : }
1796 : }
1797 526 : sql_rel *nl = rel_crossproduct(v->sql->sa, rel_dup(l), rl, rel->op);
1798 526 : r->l = nl;
1799 526 : nl->exps = njexps;
1800 526 : nl->attr = rel->attr;
1801 526 : rel->attr = NULL;
1802 526 : set_processed(nl);
1803 526 : rel_dup(r);
1804 526 : rel_destroy(rel);
1805 526 : rel = r;
1806 526 : v->changes++;
1807 : }
1808 : }
1809 : return rel;
1810 : }
1811 :
1812 : static sql_rel *
1813 3250280 : rel_optimize_joins_(visitor *v, sql_rel *rel)
1814 : {
1815 3250280 : rel = rel_push_join_exps_down(v, rel);
1816 3250280 : rel = rel_out2inner(v, rel);
1817 3250280 : rel = rel_join2semijoin(v, rel);
1818 3250280 : rel = rel_push_join_down_outer(v, rel);
1819 3250280 : return rel;
1820 : }
1821 :
1822 : static sql_rel *
1823 81464 : rel_optimize_joins(visitor *v, global_props *gp, sql_rel *rel)
1824 : {
1825 81464 : (void) gp;
1826 81464 : return rel_visitor_topdown(v, rel, &rel_optimize_joins_);
1827 : }
1828 :
1829 : run_optimizer
1830 612288 : bind_optimize_joins(visitor *v, global_props *gp)
1831 : {
1832 612288 : int flag = v->sql->sql_optimizer;
1833 612092 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
1834 1224380 : || 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 646691 : get_relations(visitor *v, sql_rel *rel, list *rels)
1842 : {
1843 900661 : if (list_empty(rel->attr) && !rel_is_ref(rel) && rel->op == op_join && rel->exps == NULL) {
1844 253970 : sql_rel *l = rel->l;
1845 253970 : sql_rel *r = rel->r;
1846 :
1847 253970 : get_relations(v, l, rels);
1848 253970 : get_relations(v, r, rels);
1849 253970 : rel->l = NULL;
1850 253970 : rel->r = NULL;
1851 253970 : rel_destroy(rel);
1852 : } else {
1853 392721 : rel = rel_join_order_(v, rel);
1854 392721 : append(rels, rel);
1855 : }
1856 646691 : }
1857 :
1858 : static void
1859 158293 : get_inner_relations(mvc *sql, sql_rel *rel, list *rels)
1860 : {
1861 246106 : if (!rel_is_ref(rel) && is_join(rel->op)) {
1862 87813 : sql_rel *l = rel->l;
1863 87813 : sql_rel *r = rel->r;
1864 :
1865 87813 : get_inner_relations(sql, l, rels);
1866 87813 : get_inner_relations(sql, r, rels);
1867 : } else {
1868 158293 : append(rels, rel);
1869 : }
1870 158293 : }
1871 :
1872 : static int
1873 996884 : exp_count(int *cnt, sql_exp *e)
1874 : {
1875 996884 : int flag;
1876 996884 : if (!e)
1877 : return 0;
1878 996884 : if (find_prop(e->p, PROP_JOINIDX))
1879 3541 : *cnt += 100;
1880 996884 : if (find_prop(e->p, PROP_HASHCOL))
1881 33672 : *cnt += 100;
1882 996884 : if (find_prop(e->p, PROP_HASHIDX))
1883 0 : *cnt += 100;
1884 996884 : switch(e->type) {
1885 368964 : case e_cmp:
1886 368964 : if (!is_complex_exp(e->flag)) {
1887 312431 : exp_count(cnt, e->l);
1888 312431 : exp_count(cnt, e->r);
1889 312431 : if (e->f)
1890 3052 : exp_count(cnt, e->f);
1891 : }
1892 368964 : flag = e->flag;
1893 368964 : switch (flag) {
1894 289124 : case cmp_equal:
1895 289124 : *cnt += 90;
1896 289124 : return 90;
1897 16851 : case cmp_notequal:
1898 16851 : *cnt += 7;
1899 16851 : return 7;
1900 6456 : case cmp_gt:
1901 : case cmp_gte:
1902 : case cmp_lt:
1903 : case cmp_lte:
1904 6456 : *cnt += 6;
1905 6456 : if (e->l) {
1906 6456 : sql_exp *l = e->l;
1907 6456 : sql_subtype *t = exp_subtype(l);
1908 6456 : if (EC_TEMP(t->type->eclass)) /* give preference to temporal ranges */
1909 172 : *cnt += 90;
1910 : }
1911 6456 : if (e->f){ /* range */
1912 3052 : *cnt += 6;
1913 3052 : return 12;
1914 : }
1915 : return 6;
1916 548 : case cmp_filter:
1917 548 : if (exps_card(e->r) > CARD_AGGR) {
1918 : /* filters for joins are special */
1919 5 : *cnt += 1000;
1920 5 : return 1000;
1921 : }
1922 543 : *cnt += 2;
1923 543 : return 2;
1924 51953 : case cmp_in:
1925 : case cmp_notin: {
1926 51953 : list *l = e->r;
1927 51953 : int c = 9 - 10*list_length(l);
1928 51953 : *cnt += c;
1929 51953 : return c;
1930 : }
1931 4032 : case cmp_or: /* prefer or over functions */
1932 4032 : *cnt += 3;
1933 4032 : return 3;
1934 : default:
1935 : return 0;
1936 : }
1937 497345 : case e_column:
1938 497345 : *cnt += 20;
1939 497345 : return 20;
1940 112541 : case e_atom:
1941 112541 : *cnt += 10;
1942 112541 : return 10;
1943 2856 : case e_func:
1944 : /* functions are more expensive, depending on the number of columns involved. */
1945 2856 : if (e->card == CARD_ATOM)
1946 : return 0;
1947 2565 : *cnt -= 5*list_length(e->l);
1948 2565 : return 5*list_length(e->l);
1949 15178 : case e_convert:
1950 : /* functions are more expensive, depending on the number of columns involved. */
1951 15178 : if (e->card == CARD_ATOM)
1952 : return 0;
1953 : /* fall through */
1954 : default:
1955 14518 : *cnt -= 5;
1956 14518 : return -5;
1957 : }
1958 : }
1959 :
1960 : int
1961 253121 : exp_keyvalue(sql_exp *e)
1962 : {
1963 253121 : int cnt = 0;
1964 56433 : exp_count(&cnt, e);
1965 253121 : return cnt;
1966 : }
1967 :
1968 : static sql_exp *
1969 680840 : joinexp_col(sql_exp *e, sql_rel *r)
1970 : {
1971 680840 : if (e->type == e_cmp) {
1972 680840 : if (rel_has_exp(r, e->l, false) >= 0)
1973 365728 : return e->l;
1974 315112 : return e->r;
1975 : }
1976 0 : assert(0);
1977 : return NULL;
1978 : }
1979 :
1980 : static sql_column *
1981 445272 : table_colexp(sql_exp *e, sql_rel *r)
1982 : {
1983 445272 : sql_table *t = r->l;
1984 :
1985 445272 : if (e->type == e_column) {
1986 432842 : const char *name = exp_name(e);
1987 432842 : node *cn;
1988 :
1989 432842 : if (r->exps) { /* use alias */
1990 794825 : for (cn = r->exps->h; cn; cn = cn->next) {
1991 791244 : sql_exp *ce = cn->data;
1992 791244 : if (strcmp(exp_name(ce), name) == 0) {
1993 429261 : name = ce->r;
1994 429261 : break;
1995 : }
1996 : }
1997 : }
1998 945041 : for (cn = ol_first_node(t->columns); cn; cn = cn->next) {
1999 941460 : sql_column *c = cn->data;
2000 941460 : if (strcmp(c->base.name, name) == 0)
2001 429261 : return c;
2002 : }
2003 : }
2004 : return NULL;
2005 : }
2006 :
2007 : static list *
2008 327092 : matching_joins(allocator *sa, list *rels, list *exps, sql_exp *je)
2009 : {
2010 327092 : sql_rel *l, *r;
2011 :
2012 327092 : assert (je->type == e_cmp);
2013 :
2014 327092 : l = find_rel(rels, je->l);
2015 327092 : r = find_rel(rels, je->r);
2016 327092 : if (l && r) {
2017 326948 : list *res;
2018 326948 : list *n_rels = sa_list(sa);
2019 :
2020 326948 : append(n_rels, l);
2021 326948 : append(n_rels, r);
2022 326948 : res = list_select(exps, n_rels, (fcmp) &exp_joins_rels, (fdup)NULL);
2023 326948 : return res;
2024 : }
2025 144 : 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 420281 : find_fk_index(mvc *sql, sql_table *l, list *lcols, sql_table *r, list *rcols)
2037 : {
2038 420281 : sql_trans *tr = sql->session->tr;
2039 :
2040 420281 : if (l->idxs) {
2041 420281 : node *in;
2042 504646 : for (in = ol_first_node(l->idxs); in; in = in->next){
2043 85205 : sql_idx *li = in->data;
2044 85205 : 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 654184 : find_basetable( sql_rel *r)
2061 : {
2062 971712 : if (!r)
2063 : return NULL;
2064 964999 : switch(r->op) {
2065 524133 : case op_basetable:
2066 524133 : if (!r->l)
2067 0 : return NULL;
2068 : return r;
2069 317528 : case op_semi:
2070 : case op_anti:
2071 : case op_project:
2072 : case op_select:
2073 : case op_topn:
2074 : case op_sample:
2075 317528 : return find_basetable(r->l);
2076 : default:
2077 : return NULL;
2078 : }
2079 : }
2080 :
2081 : static int
2082 90147 : exps_count(list *exps)
2083 : {
2084 90147 : node *n;
2085 90147 : int cnt = 0;
2086 :
2087 90147 : if (!exps)
2088 : return 0;
2089 205996 : for (n = exps->h; n; n=n->next)
2090 115849 : exp_count(&cnt, n->data);
2091 90147 : return cnt;
2092 : }
2093 :
2094 : static list *
2095 231118 : order_join_expressions(mvc *sql, list *dje, list *rels)
2096 : {
2097 231118 : node *n;
2098 231118 : int cnt = list_length(dje);
2099 :
2100 231118 : if (cnt <= 1)
2101 : return dje;
2102 :
2103 62109 : list *res = sa_list(sql->sa);
2104 62109 : int i, *keys = SA_NEW_ARRAY(sql->ta, int, cnt);
2105 62109 : void **data = SA_NEW_ARRAY(sql->ta, void*, cnt);
2106 :
2107 258797 : for (n = dje->h, i = 0; n; n = n->next, i++) {
2108 196688 : sql_exp *e = n->data;
2109 :
2110 196688 : keys[i] = exp_keyvalue(e);
2111 : /* add some weight for the selections */
2112 196688 : if (e->type == e_cmp && !is_complex_exp(e->flag)) {
2113 196662 : sql_rel *l = find_rel(rels, e->l);
2114 196662 : sql_rel *r = find_rel(rels, e->r);
2115 :
2116 196662 : if (l && is_select(l->op) && l->exps)
2117 49063 : keys[i] += list_length(l->exps)*10 + exps_count(l->exps);
2118 196662 : if (r && is_select(r->op) && r->exps)
2119 41084 : keys[i] += list_length(r->exps)*10 + exps_count(r->exps);
2120 : }
2121 196688 : data[i] = n->data;
2122 : }
2123 : /* sort descending */
2124 62109 : GDKqsort(keys, data, NULL, cnt, sizeof(int), sizeof(void *), TYPE_int, true, true);
2125 320906 : for(i=0; i<cnt; i++) {
2126 196688 : list_append(res, data[i]);
2127 : }
2128 : return res;
2129 : }
2130 :
2131 : static int
2132 214715 : find_join_rels(list **L, list **R, list *exps, list *rels)
2133 : {
2134 214715 : node *n;
2135 :
2136 214715 : *L = sa_list(exps->sa);
2137 214715 : *R = sa_list(exps->sa);
2138 214715 : if (!exps || list_length(exps) <= 1)
2139 : return -1;
2140 274553 : for(n = exps->h; n; n = n->next) {
2141 207571 : sql_exp *e = n->data;
2142 207571 : sql_rel *l = NULL, *r = NULL;
2143 :
2144 207571 : if (!is_complex_exp(e->flag)){
2145 207564 : l = find_rel(rels, e->l);
2146 207564 : r = find_rel(rels, e->r);
2147 : }
2148 207564 : if (l<r) {
2149 132984 : list_append(*L, l);
2150 132984 : list_append(*R, r);
2151 : } else {
2152 74587 : list_append(*L, r);
2153 74587 : list_append(*R, l);
2154 : }
2155 : }
2156 : return 0;
2157 : }
2158 :
2159 : static list *
2160 66982 : distinct_join_exps(list *aje, list *lrels, list *rrels)
2161 : {
2162 66982 : node *n, *m, *o, *p;
2163 66982 : int len = list_length(aje), i, j;
2164 66982 : char *used = SA_ZNEW_ARRAY(aje->sa, char, len);
2165 66982 : list *res = sa_list(aje->sa);
2166 :
2167 66982 : assert(len == list_length(lrels));
2168 274553 : for(n = lrels->h, m = rrels->h, j = 0; n && m;
2169 207571 : n = n->next, m = m->next, j++) {
2170 207571 : if (n->data && m->data)
2171 924351 : for(o = n->next, p = m->next, i = j+1; o && p;
2172 716832 : o = o->next, p = p->next, i++) {
2173 716832 : if (o->data == n->data && p->data == m->data)
2174 29345 : used[i] = 1;
2175 : }
2176 : }
2177 274553 : for (i = 0, n = aje->h; i < len; n = n->next, i++) {
2178 207571 : if (!used[i])
2179 183233 : list_append(res, n->data);
2180 : }
2181 66982 : return res;
2182 : }
2183 :
2184 : static list *
2185 214715 : find_fk( mvc *sql, list *rels, list *exps)
2186 : {
2187 214715 : node *djn;
2188 214715 : list *sdje, *aje, *dje;
2189 214715 : list *lrels, *rrels;
2190 :
2191 : /* first find the distinct join expressions */
2192 214715 : aje = list_select(exps, rels, (fcmp) &exp_is_join, (fdup)NULL);
2193 : /* add left/right relation */
2194 214715 : if (find_join_rels(&lrels, &rrels, aje, rels) < 0)
2195 : dje = aje;
2196 : else
2197 66982 : dje = distinct_join_exps(aje, lrels, rrels);
2198 545307 : for(djn=dje->h; djn; djn = djn->next) {
2199 : /* equal join expressions */
2200 330685 : sql_idx *idx = NULL;
2201 330685 : sql_exp *je = djn->data, *le = je->l, *re = je->r;
2202 :
2203 330685 : if (is_complex_exp(je->flag))
2204 : break;
2205 330592 : if (!find_prop(je->p, PROP_JOINIDX)) {
2206 327092 : int swapped = 0;
2207 327092 : list *aaje = matching_joins(sql->sa, rels, aje, je);
2208 327092 : list *eje = list_select(aaje, (void*)1, (fcmp) &exp_is_eqjoin, (fdup)NULL);
2209 327092 : sql_rel *lr = find_rel(rels, le), *olr = lr;
2210 327092 : sql_rel *rr = find_rel(rels, re), *orr = rr;
2211 327092 : sql_rel *bt = NULL;
2212 327092 : char *iname;
2213 :
2214 327092 : sql_table *l, *r;
2215 327092 : list *lexps = list_map(eje, lr, (fmap) &joinexp_col);
2216 327092 : list *rexps = list_map(eje, rr, (fmap) &joinexp_col);
2217 327092 : list *lcols, *rcols;
2218 :
2219 327092 : lr = find_basetable(lr);
2220 327092 : rr = find_basetable(rr);
2221 327092 : if (!lr || !rr)
2222 217450 : continue;
2223 226261 : l = lr->l;
2224 226261 : r = rr->l;
2225 226261 : lcols = list_map(lexps, lr, (fmap) &table_colexp);
2226 226261 : rcols = list_map(rexps, rr, (fmap) &table_colexp);
2227 226261 : lcols->destroy = NULL;
2228 226261 : rcols->destroy = NULL;
2229 226261 : if (list_length(lcols) != list_length(rcols))
2230 15787 : continue;
2231 :
2232 210474 : idx = find_fk_index(sql, l, lcols, r, rcols);
2233 210474 : if (!idx) {
2234 209807 : idx = find_fk_index(sql, r, rcols, l, lcols);
2235 209807 : swapped = 1;
2236 : }
2237 :
2238 210474 : 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 214715 : sdje = order_join_expressions(sql, dje, rels);
2294 214715 : return sdje;
2295 : }
2296 :
2297 : static int
2298 508502 : rels_find_one_rel( sql_rel **rels, int nr, sql_exp *e)
2299 : {
2300 508502 : int fnd = 0;
2301 :
2302 4245648 : for(int i = 1; i<=nr; i++) {
2303 3737212 : if (rel_has_exp(rels[i], e, false) == 0) {
2304 508261 : 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 138751 : order_joins(visitor *v, list *rels, list *exps)
2342 : {
2343 138751 : sql_rel *top = NULL, *l = NULL, *r = NULL;
2344 138751 : sql_exp *cje;
2345 138751 : node *djn;
2346 138751 : list *sdje, *n_rels = NULL;
2347 138751 : int fnd = 0;
2348 138751 : unsigned int rsingle;
2349 138751 : int direct = 1;
2350 :
2351 : /* find foreign keys and reorder the expressions on reducing quality */
2352 138751 : sdje = find_fk(v->sql, rels, exps);
2353 :
2354 392897 : for(djn = sdje->h; djn; djn = djn->next ) {
2355 254146 : sql_exp *e = djn->data;
2356 254146 : list_remove_data(exps, NULL, e);
2357 : }
2358 138751 : 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 138751 : int nr_exps = list_length(sdje), nr_rels = list_length(rels), ci = 1;
2364 138751 : if (nr_rels > 64) {
2365 1 : direct = 0;
2366 1 : n_rels = sa_list(v->sql->ta);
2367 : }
2368 138751 : sql_rel **rels_a = SA_NEW_ARRAY(v->sql->ta, sql_rel*, nr_rels+1); /* don't use slot 0 */
2369 138751 : rels_a[0] = NULL;
2370 531472 : for (node *n = rels->h; n; n = n->next, ci++) {
2371 392721 : rels_a[ci] = n->data;
2372 : }
2373 138751 : ulng *h = SA_NEW_ARRAY(v->sql->ta, ulng, nr_exps), rel_mask = 0; /* bit field (for > 64 its an imprint) */
2374 138751 : uint16_t *r1 = SA_NEW_ARRAY(v->sql->ta, uint16_t, nr_exps);
2375 138751 : uint16_t *r2 = SA_NEW_ARRAY(v->sql->ta, uint16_t, nr_exps);
2376 : /* change r3 into rest list's */
2377 138751 : int *r3 = SA_NEW_ARRAY(v->sql->ta, int, nr_exps);
2378 :
2379 138751 : ci = 0;
2380 392897 : for (node *n = sdje->h; n; n = n->next, ci++) {
2381 254146 : sql_exp *cje = n->data;
2382 :
2383 254146 : h[ci] = r1[ci] = r2[ci] = 0;
2384 254146 : r3[ci] = 0;
2385 : /* h[ci] = exp_find_rels(cje, rels) */
2386 254146 : 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 254146 : cje->tmp = ci;
2389 254146 : r1[ci] = rels_find_one_rel(rels_a, nr_rels, cje->l);
2390 254146 : r2[ci] = rels_find_one_rel(rels_a, nr_rels, cje->r);
2391 254146 : if (r1[ci])
2392 254012 : h[ci] |= ((ulng)1)<<((r1[ci]-1)%64);
2393 254146 : if (r2[ci])
2394 253993 : h[ci] |= ((ulng)1)<<((r2[ci]-1)%64);
2395 254146 : if (cje->f) {
2396 210 : r3[ci] = rels_find_one_rel(rels_a, nr_rels, cje->f);
2397 210 : if (r3[ci] == r2[ci])
2398 190 : r3[ci] = 0;
2399 210 : 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 138751 : if (list_length(rels) >= 2 && sdje->h) {
2407 277468 : for (node *n = sdje->h; n && !l && !r; n = n->next, ci++) {
2408 138739 : 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 138739 : if (0 && popcount64(h[cje->tmp]) > 2)
2416 : assert(0);
2417 138739 : 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 138739 : l = rels_a[r1[cje->tmp]];
2420 138739 : r = rels_a[r2[cje->tmp]];
2421 138739 : if (l && r)
2422 138604 : rel_mask |= h[cje->tmp];
2423 : }
2424 : }
2425 138729 : cje->tmp = 0;
2426 :
2427 138729 : if (l && r && l != r)
2428 138604 : list_remove_data(sdje, NULL, cje);
2429 : }
2430 :
2431 138751 : if (l && r && l != r) {
2432 138604 : list_remove_data(rels, NULL, l);
2433 138604 : list_remove_data(rels, NULL, r);
2434 138604 : 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 138604 : rsingle = is_single(r);
2445 138604 : reset_single(r);
2446 138604 : top = rel_crossproduct(v->sql->sa, l, r, op_join);
2447 138604 : if (rsingle)
2448 5088 : set_single(r);
2449 138604 : rel_join_add_exp(v->sql->sa, top, cje);
2450 :
2451 : /* all other join expressions on these 2 relations */
2452 142391 : for (node *en = exps->h; en; ) {
2453 3787 : node *next = en->next;
2454 3787 : sql_exp *e = en->data;
2455 3787 : if (rel_rebind_exp(v->sql, top, e)) {
2456 3615 : rel_join_add_exp(v->sql->sa, top, e);
2457 3615 : list_remove_data(exps, NULL, e);
2458 : }
2459 : en = next;
2460 : }
2461 : fnd = 1;
2462 : }
2463 : /* build join tree using the ordered list */
2464 251444 : while(list_length(sdje) && fnd) {
2465 112693 : fnd = 0;
2466 : /* find the first expression which could be added */
2467 856475 : for(djn = sdje->h; djn && !fnd && rels->h; djn = (!fnd)?djn->next:NULL) {
2468 371891 : node *en;
2469 371891 : l = r = NULL;
2470 :
2471 371891 : cje = djn->data;
2472 371891 : if ((h[cje->tmp] & rel_mask) > 0) {
2473 112609 : if (rel_mask & (((ulng)1)<<((r1[cje->tmp]-1)%64)))
2474 64437 : l = rels_a[r1[cje->tmp]];
2475 112609 : if (rel_mask & (((ulng)1)<<((r2[cje->tmp]-1)%64)))
2476 48173 : r = rels_a[r2[cje->tmp]];
2477 : }
2478 371891 : 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 371891 : 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 371891 : } 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 112609 : rel_mask |= h[cje->tmp];
2494 112609 : if (l) {
2495 64437 : r = rels_a[r2[cje->tmp]];
2496 : } else {
2497 48172 : l = r;
2498 48172 : r = rels_a[r1[cje->tmp]];
2499 : }
2500 112609 : 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 112609 : list_remove_data(sdje, NULL, cje);
2508 :
2509 112609 : list_remove_data(rels, NULL, r);
2510 112609 : if (!direct)
2511 63 : append(n_rels, r);
2512 :
2513 : /* create a join using the current expression */
2514 112609 : rsingle = is_single(r);
2515 112609 : reset_single(r);
2516 112609 : top = rel_crossproduct(v->sql->sa, top, r, op_join);
2517 112609 : if (rsingle)
2518 0 : set_single(r);
2519 112609 : rel_join_add_exp(v->sql->sa, top, cje);
2520 :
2521 : /* all join expressions on these tables */
2522 112998 : 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 680664 : for (en = sdje->h; en; ) {
2534 568055 : node *next = en->next;
2535 568055 : sql_exp *e = en->data;
2536 568055 : 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 2719 : rel_join_add_exp(v->sql->sa, top, e);
2539 2719 : list_remove_data(sdje, NULL, en->data);
2540 : }
2541 : en = next;
2542 : }
2543 : fnd = 1;
2544 : }
2545 : }
2546 : }
2547 138751 : if (list_length(rels)) { /* more relations */
2548 1188 : node *n;
2549 4092 : for(n=rels->h; n; n = n->next) {
2550 2904 : sql_rel *nr = n->data;
2551 :
2552 2904 : if (top) {
2553 2757 : rsingle = is_single(nr);
2554 2757 : reset_single(nr);
2555 2757 : top = rel_crossproduct(v->sql->sa, top, nr, op_join);
2556 2757 : if (rsingle)
2557 0 : set_single(nr);
2558 : } else
2559 : top = nr;
2560 : }
2561 : }
2562 138751 : if (list_length(sdje)) {
2563 209 : if (list_empty(exps))
2564 : exps = sdje;
2565 : else
2566 0 : exps = list_merge(exps, sdje, (fdup)NULL);
2567 : }
2568 138751 : if (list_length(exps)) { /* more expressions (add selects) */
2569 233 : top = rel_select(v->sql->sa, top, NULL);
2570 471 : for(node *n=exps->h; n; n = n->next) {
2571 238 : sql_exp *e = n->data;
2572 :
2573 238 : if (exp_is_join_exp(e) == 0) {
2574 226 : sql_rel *nr = NULL;
2575 226 : if (is_theta_exp(e->flag)) {
2576 138 : nr = rel_push_join(v->sql, top->l, e->l, e->r, e->f, e, 0);
2577 88 : } else if (e->flag == cmp_filter || e->flag == cmp_or) {
2578 88 : sql_exp *l = exps_find_one_multi_exp(e->l), *r = exps_find_one_multi_exp(e->r);
2579 88 : if (l && r)
2580 82 : nr = rel_push_join(v->sql, top->l, l, r, NULL, e, 0);
2581 : }
2582 220 : if (!nr)
2583 6 : rel_join_add_exp(v->sql->sa, top->l, e);
2584 : } else
2585 12 : rel_select_add_exp(v->sql->sa, top, e);
2586 : }
2587 233 : if (list_empty(top->exps)) { /* empty select */
2588 221 : sql_rel *l = top->l;
2589 221 : top->l = NULL;
2590 221 : rel_destroy(top);
2591 221 : top = l;
2592 : }
2593 : }
2594 : return top;
2595 : }
2596 :
2597 : static int
2598 392721 : rel_neg_in_size(sql_rel *r)
2599 : {
2600 392721 : if ((is_union(r->op) /*|| is_munion(r->op)*/) && r->nrcols == 0)
2601 0 : return -1 + rel_neg_in_size(r->l);
2602 392721 : if (is_project(r->op) && r->nrcols == 0)
2603 0 : return -1;
2604 : return 0;
2605 : }
2606 :
2607 392721 : static void _rel_destroy(void *dummy, sql_rel *rel)
2608 : {
2609 392721 : (void)dummy;
2610 392721 : rel_destroy(rel);
2611 392721 : }
2612 :
2613 : static list *
2614 138751 : push_in_join_down(mvc *sql, list *rels, list *exps)
2615 : {
2616 138751 : node *n;
2617 138751 : int restart = 1;
2618 138751 : list *nrels;
2619 :
2620 : /* we should sort these first, ie small in's before large one's */
2621 138751 : nrels = list_sort(rels, (fkeyvalue)&rel_neg_in_size, (fdup)&rel_dup);
2622 :
2623 : /* we need to cleanup, the new refs ! */
2624 138751 : rels->destroy = (fdestroy)_rel_destroy;
2625 138751 : list_destroy(rels);
2626 138751 : rels = nrels;
2627 :
2628 : /* one of the rels should be a op_union with nrcols == 0 */
2629 416253 : while (restart) {
2630 531472 : for (n = rels->h; n; n = n->next) {
2631 392721 : sql_rel *r = n->data;
2632 :
2633 392721 : restart = 0;
2634 392721 : 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 138751 : return rels;
2670 : }
2671 :
2672 : static list *
2673 675261 : push_up_join_exps( mvc *sql, sql_rel *rel)
2674 : {
2675 675261 : if (rel_is_ref(rel))
2676 : return NULL;
2677 :
2678 637594 : switch(rel->op) {
2679 266247 : case op_join: {
2680 266247 : sql_rel *rl = rel->l;
2681 266247 : sql_rel *rr = rel->r;
2682 266247 : list *l, *r;
2683 :
2684 266247 : 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 266231 : l = push_up_join_exps(sql, rl);
2690 266231 : r = push_up_join_exps(sql, rr);
2691 266231 : if (l && r) {
2692 10 : l = list_merge(l, r, (fdup)NULL);
2693 10 : r = NULL;
2694 266221 : } else if (!l) {
2695 159937 : l = r;
2696 159937 : r = NULL;
2697 : }
2698 266231 : if (rel->exps) {
2699 235386 : if (l && !r)
2700 96601 : r = l;
2701 235386 : l = list_merge(rel->exps, r, (fdup)NULL);
2702 : }
2703 266231 : rel->exps = NULL;
2704 266231 : return l;
2705 : }
2706 : default:
2707 : return NULL;
2708 : }
2709 : }
2710 :
2711 : static sql_rel *
2712 260056 : reorder_join(visitor *v, sql_rel *rel)
2713 : {
2714 260056 : list *exps, *rels;
2715 :
2716 260056 : if (is_innerjoin(rel->op) && !is_single(rel) && !rel_is_ref(rel) && list_empty(rel->attr)) {
2717 160030 : if (list_empty(rel->exps)) {
2718 22088 : sql_rel *l = rel->l, *r = rel->r;
2719 22088 : if (!is_innerjoin(l->op) && !is_innerjoin(r->op))
2720 : return rel;
2721 : }
2722 142799 : rel->exps = push_up_join_exps(v->sql, rel);
2723 : }
2724 :
2725 242825 : if (!is_innerjoin(rel->op) || is_single(rel) || rel_is_ref(rel) || list_empty(rel->exps) || !list_empty(rel->attr)) {
2726 104074 : if (!list_empty(rel->exps)) { /* cannot add join idxs to cross products */
2727 70480 : exps = rel->exps;
2728 70480 : rel->exps = NULL; /* should be all crosstables by now */
2729 70480 : rels = sa_list(v->sql->ta);
2730 : /* try to use an join index also for outer joins */
2731 70480 : get_inner_relations(v->sql, rel, rels);
2732 70480 : int cnt = list_length(exps);
2733 70480 : rel->exps = find_fk(v->sql, rels, exps);
2734 70480 : if (list_length(rel->exps) != cnt)
2735 16403 : rel->exps = order_join_expressions(v->sql, exps, rels);
2736 : }
2737 104074 : rel->l = rel_join_order_(v, rel->l);
2738 104074 : rel->r = rel_join_order_(v, rel->r);
2739 : } else {
2740 138751 : exps = rel->exps;
2741 138751 : rel->exps = NULL; /* should be all crosstables by now */
2742 138751 : rels = sa_list(v->sql->ta);
2743 138751 : get_relations(v, rel, rels);
2744 138751 : if (list_length(rels) > 1) {
2745 138751 : rels = push_in_join_down(v->sql, rels, exps);
2746 138751 : 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 2234133 : rel_join_order_(visitor *v, sql_rel *rel)
2756 : {
2757 2234133 : if (!rel)
2758 : return rel;
2759 :
2760 2220134 : switch (rel->op) {
2761 : case op_basetable:
2762 : break;
2763 3075 : case op_table:
2764 3075 : if (IS_TABLE_PROD_FUNC(rel->flag) || rel->flag == TABLE_FROM_RELATION)
2765 3075 : 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 10580 : 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 10580 : rel->l = rel_join_order_(v, rel->l);
2781 10580 : rel->r = rel_join_order_(v, rel->r);
2782 10580 : break;
2783 110000 : case op_munion:
2784 110000 : assert(rel->l);
2785 446210 : for (node *n = ((list*)rel->l)->h; n; n = n->next)
2786 336210 : n->data = rel_join_order_(v, n->data);
2787 : break;
2788 1186090 : case op_project:
2789 : case op_select:
2790 : case op_groupby:
2791 : case op_topn:
2792 : case op_sample:
2793 1186090 : rel->l = rel_join_order_(v, rel->l);
2794 1186090 : 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 10876 : case op_insert:
2804 : case op_update:
2805 : case op_delete:
2806 10876 : rel->r = rel_join_order_(v, rel->r);
2807 10876 : break;
2808 : case op_truncate:
2809 : break;
2810 : }
2811 2220134 : if (is_join(rel->op))
2812 260056 : rel = reorder_join(v, rel);
2813 : return rel;
2814 : }
2815 :
2816 : static sql_rel *
2817 75749 : rel_join_order(visitor *v, global_props *gp, sql_rel *rel)
2818 : {
2819 75749 : (void) gp;
2820 75749 : sql_rel *r = rel_join_order_(v, rel);
2821 75749 : sa_reset(v->sql->ta);
2822 75749 : return r;
2823 : }
2824 :
2825 : run_optimizer
2826 612289 : bind_join_order(visitor *v, global_props *gp)
2827 : {
2828 612289 : int flag = v->sql->sql_optimizer;
2829 612093 : return gp->opt_level == 1 && gp->opt_cycle < 10 && !gp->cnt[op_update] && (gp->cnt[op_join] || gp->cnt[op_left] ||
2830 1218510 : 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 668218 : 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 668218 : (void) v;
2842 668218 : (void) gp;
2843 668218 : return NULL;
2844 : }
2845 :
2846 :
2847 : static int
2848 12424 : is_identity_of(sql_exp *e, sql_rel *l)
2849 : {
2850 12424 : if (e->type != e_cmp)
2851 : return 0;
2852 12397 : if (!is_identity(e->l, l) || !is_identity(e->r, l) || (e->f && !is_identity(e->f, l)))
2853 12397 : return 0;
2854 : return 1;
2855 : }
2856 :
2857 : static inline sql_rel *
2858 15738 : rel_rewrite_semijoin(visitor *v, sql_rel *rel)
2859 : {
2860 15738 : assert(is_semi(rel->op));
2861 : {
2862 15738 : sql_rel *l = rel->l;
2863 15738 : sql_rel *r = rel->r;
2864 15738 : sql_rel *rl = (r->l)?r->l:NULL;
2865 15738 : int on_identity = 1;
2866 :
2867 15738 : 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 15738 : sql_rel *l = rel->l, *rl = NULL;
2895 15738 : sql_rel *r = rel->r, *or = r;
2896 :
2897 15738 : if (r)
2898 15738 : rl = r->l;
2899 15738 : if (r && is_project(r->op)) {
2900 12678 : r = rl;
2901 12678 : if (r)
2902 12490 : 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 15738 : if (l && r && rl &&
2912 14972 : is_basetable(l->op) && is_basetable(rl->op) &&
2913 3314 : 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 437212 : rel_push_semijoin_down_or_up(visitor *v, sql_rel *rel)
2995 : {
2996 437212 : uint8_t cycle = *(uint8_t*) v->data;
2997 :
2998 437212 : if (rel->op == op_join && rel->exps && rel->l) {
2999 405479 : sql_rel *l = rel->l, *r = rel->r;
3000 :
3001 405479 : 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 437190 : if (rel->op == op_join && rel->exps && rel->l) {
3012 405457 : sql_rel *l = rel->l, *r = rel->r;
3013 405457 : sql_rel *ll;
3014 :
3015 405457 : if (is_join(l->op) && !rel_is_ref(l) && is_select(r->op) && !rel_is_ref(r)) {
3016 6744 : ll = l->l;
3017 6744 : 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 437139 : if (rel->op == op_semi && rel->exps && rel->l) {
3028 11335 : sql_rel *jl = rel->l, *ojl = jl;
3029 :
3030 11335 : set_processed(jl);
3031 25500 : for (node *n = rel->exps->h; n;) {
3032 14165 : node *next = n->next;
3033 14165 : sql_exp *e = n->data;
3034 :
3035 14165 : 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 11335 : if (ojl != jl)
3046 14 : set_processed(jl);
3047 : }
3048 437139 : if (rel->op == op_semi && rel->exps && rel->l) {
3049 11335 : operator_type op = rel->op, lop;
3050 11335 : node *n;
3051 11335 : sql_rel *l = rel->l, *ll = NULL, *lr = NULL;
3052 11335 : sql_rel *r = rel->r;
3053 11335 : list *exps = rel->exps, *nsexps, *njexps, *nsattr, *njattr;
3054 11335 : 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 11335 : if (!is_join(l->op) || is_full(l->op) || rel_is_ref(l) || is_single(l))
3062 : return rel;
3063 :
3064 1137 : lop = l->op;
3065 1137 : ll = l->l;
3066 1137 : lr = l->r;
3067 :
3068 : /* check which side is used and other exps are atoms or from right of semijoin */
3069 2184 : for(n = exps->h; n; n = n->next) {
3070 1212 : sql_exp *sje = n->data;
3071 :
3072 1212 : 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 2360 : if (left &&
3079 2360 : ((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 1200 : (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 873 : left = 0;
3084 1673 : if (right &&
3085 1600 : ((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 1180 : if (!right && !left)
3091 : return rel;
3092 : }
3093 972 : if (left && is_right(lop))
3094 : return rel;
3095 971 : if (right && is_left(lop))
3096 : return rel;
3097 969 : nsexps = exps_copy(v->sql, rel->exps);
3098 969 : nsattr = exps_copy(v->sql, rel->attr);
3099 969 : njexps = exps_copy(v->sql, l->exps);
3100 969 : njattr = exps_copy(v->sql, l->attr);
3101 969 : if (left)
3102 231 : l = rel_crossproduct(v->sql->sa, rel_dup(ll), rel_dup(r), op);
3103 : else
3104 738 : l = rel_crossproduct(v->sql->sa, rel_dup(lr), rel_dup(r), op);
3105 969 : l->exps = nsexps;
3106 969 : l->attr = nsattr;
3107 969 : set_processed(l);
3108 969 : if (left)
3109 231 : l = rel_crossproduct(v->sql->sa, l, rel_dup(lr), lop);
3110 : else
3111 738 : l = rel_crossproduct(v->sql->sa, rel_dup(ll), l, lop);
3112 969 : l->exps = njexps;
3113 969 : l->attr = njattr;
3114 969 : set_processed(l);
3115 969 : rel_destroy(rel);
3116 969 : rel = l;
3117 969 : if (cycle <= 0)
3118 570 : 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 4349 : rel_rewrite_antijoin(visitor *v, sql_rel *rel)
3126 : {
3127 4349 : sql_rel *l = rel->l;
3128 4349 : sql_rel *r = rel->r;
3129 :
3130 4349 : assert(rel->op == op_anti);
3131 4349 : 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 3250295 : rel_optimize_semi_and_anti_(visitor *v, sql_rel *rel)
3159 : {
3160 : /* rewrite semijoin (A, join(A,B)) into semijoin (A,B) */
3161 3250295 : if (rel && is_semi(rel->op))
3162 15738 : rel = rel_rewrite_semijoin(v, rel);
3163 : /* push semijoin through join */
3164 3250295 : if (rel && (is_semi(rel->op) || is_innerjoin(rel->op)))
3165 437212 : rel = rel_push_semijoin_down_or_up(v, rel);
3166 : /* antijoin(a, union(b,c)) -> antijoin(antijoin(a,b), c) */
3167 3250295 : if (rel && rel->op == op_anti)
3168 4349 : rel = rel_rewrite_antijoin(v, rel);
3169 3250295 : return rel;
3170 : }
3171 :
3172 : static sql_rel *
3173 81464 : rel_optimize_semi_and_anti(visitor *v, global_props *gp, sql_rel *rel)
3174 : {
3175 81464 : v->data = &gp->opt_cycle;
3176 81464 : rel = rel_visitor_bottomup(v, rel, &rel_optimize_semi_and_anti_);
3177 81464 : v->data = gp;
3178 81464 : return rel;
3179 : }
3180 :
3181 : run_optimizer
3182 612289 : bind_optimize_semi_and_anti(visitor *v, global_props *gp)
3183 : {
3184 : /* Important -> Re-write semijoins after rel_join_order */
3185 612289 : int flag = v->sql->sql_optimizer;
3186 612093 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
3187 1224382 : || 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 1521081 : rel_semijoin_use_fk(visitor *v, sql_rel *rel)
3193 : {
3194 1521081 : if (is_semi(rel->op) && rel->exps) {
3195 5484 : list *exps = rel->exps;
3196 5484 : list *rels = sa_list(v->sql->sa);
3197 :
3198 5484 : rel->exps = NULL;
3199 5484 : append(rels, rel->l);
3200 5484 : append(rels, rel->r);
3201 5484 : (void) find_fk( v->sql, rels, exps);
3202 :
3203 5484 : rel->exps = exps;
3204 : }
3205 1521081 : 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 1521081 : rel_push_join_down(visitor *v, sql_rel *rel)
3222 : {
3223 1521081 : if (!rel_is_ref(rel) && ((is_left(rel->op) || rel->op == op_join || is_semi(rel->op)) && rel->l && rel->exps)) {
3224 224608 : sql_rel *gb = rel->r, *ogb = gb, *l = NULL, *rell = rel->l;
3225 :
3226 224608 : if (is_simple_project(gb->op) && !rel_is_ref(gb))
3227 44652 : gb = gb->l;
3228 :
3229 224608 : if (rel_is_ref(rell) || !gb || rel_is_ref(gb))
3230 : return rel;
3231 :
3232 214964 : 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 223702 : rel_simplify_project_fk_join(mvc *sql, sql_rel *r, list *pexps, list *orderexps, int *changes)
3325 : {
3326 223702 : sql_rel *rl = r->l, *rr = r->r, *nr = NULL;
3327 223702 : sql_exp *je, *le, *nje, *re;
3328 223702 : int fk_left = 1;
3329 :
3330 : /* check for foreign key join */
3331 223702 : if (list_length(r->exps) != 1 || !list_empty(r->attr))
3332 7436 : return r;
3333 216266 : 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 3444343 : rel_simplify_fk_joins(visitor *v, sql_rel *rel)
3479 : {
3480 3444343 : sql_rel *r = NULL;
3481 :
3482 3444343 : if (is_simple_project(rel->op))
3483 1115345 : r = rel->l;
3484 :
3485 3444380 : 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 223702 : sql_rel *or = r;
3487 :
3488 223702 : r = rel_simplify_project_fk_join(v->sql, r, rel->exps, rel->r, &v->changes);
3489 223702 : if (r == or)
3490 : return rel;
3491 37 : rel_destroy(rel->l);
3492 37 : rel->l = r;
3493 : }
3494 :
3495 3220678 : if (!is_groupby(rel->op))
3496 : return rel;
3497 :
3498 86880 : r = rel->l;
3499 128185 : while(r && is_simple_project(r->op))
3500 41305 : r = r->l;
3501 :
3502 101069 : 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 105101 : 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 1631 : get_partition_by_key_columns(allocator *sa, sql_rel *r) {
3545 18002 : for (node* n = r->exps->h; n; n = n->next) {
3546 16595 : sql_exp *e = n->data;
3547 :
3548 16595 : if (e->type == e_func) {
3549 5931 : sql_subfunc *f = e->f;
3550 :
3551 : // aggregation function
3552 5931 : 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 : * Checks if a filter column is also used as an aggregation key, so it can be later safely pushed down.
3577 : */
3578 : static int
3579 187 : filter_column_in_partition_by_columns(sql_exp *column, list *keyColumns)
3580 : {
3581 : /* check if it is a column or an e_convert, and get the actual column if it is the latter */
3582 187 : if (column->type == e_convert) {
3583 1 : column = column->l;
3584 : }
3585 :
3586 187 : char *tableName = column->l;
3587 187 : char *columnName = column->r;
3588 :
3589 404 : for (node *n = keyColumns->h; n; n = n->next) {
3590 226 : sql_exp *keyCol = n->data;
3591 226 : char *keyColTableName = keyCol->l;
3592 226 : char *keyColColumnName = keyCol->r;
3593 :
3594 226 : if (!strcmp(tableName, keyColTableName) && !strcmp(columnName, keyColColumnName)) {
3595 : /* match */
3596 : return 1;
3597 : }
3598 : }
3599 :
3600 : /* no matches found */
3601 : return 0;
3602 : }
3603 :
3604 : /*
3605 : * Push select down, pushes the selects through (simple) projections. Also
3606 : * it cleans up the projections which become useless.
3607 : *
3608 : * WARNING - Make sure to call try_remove_empty_select macro before returning so we ensure
3609 : * possible generated empty selects won't never be generated
3610 : */
3611 : static sql_rel *
3612 6811605 : rel_push_select_down(visitor *v, sql_rel *rel)
3613 : {
3614 6811605 : list *exps = NULL;
3615 6811605 : sql_rel *r = NULL;
3616 6811605 : node *n;
3617 :
3618 6811605 : if (rel_is_ref(rel)) {
3619 363780 : if (is_select(rel->op) && !list_empty(rel->exps)) {
3620 : /* add inplace empty select */
3621 1724 : sql_rel *l = rel_select(v->sql->sa, rel->l, NULL);
3622 :
3623 1724 : l->exps = rel->exps;
3624 1724 : set_processed(l);
3625 1724 : rel->exps = NULL;
3626 1724 : rel->l = l;
3627 1724 : v->changes++;
3628 : }
3629 363780 : return rel;
3630 : }
3631 :
3632 : /* don't make changes for empty selects */
3633 6447825 : if (is_select(rel->op) && list_empty(rel->exps))
3634 10 : return try_remove_empty_select(v, rel);
3635 :
3636 : /* merge 2 selects */
3637 6447815 : r = rel->l;
3638 6447815 : if (is_select(rel->op) && r && r->exps && is_select(r->op) && !(rel_is_ref(r)) && !exps_have_func(rel->exps)) {
3639 27 : (void)list_merge(r->exps, rel->exps, (fdup)NULL);
3640 27 : rel->l = NULL;
3641 27 : rel_destroy(rel);
3642 27 : v->changes++;
3643 27 : return try_remove_empty_select(v, r);
3644 : }
3645 : /*
3646 : * Push select through semi/anti join
3647 : * select (semi(A,B)) == semi(select(A), B)
3648 : */
3649 6447788 : if (is_select(rel->op) && r && is_semi(r->op) && !(rel_is_ref(r))) {
3650 188 : rel->l = r->l;
3651 188 : r->l = rel;
3652 188 : v->changes++;
3653 : /*
3654 : * if A has 2 references (ie used on both sides of
3655 : * the semi join), we also push the select into A.
3656 : */
3657 188 : if (rel_is_ref(rel->l) && rel->l == rel_find_ref(r->r)){
3658 0 : sql_rel *lx = rel->l;
3659 0 : sql_rel *rx = r->r;
3660 0 : if (lx->ref.refcnt == 2 && !rel_is_ref(rx)) {
3661 0 : while (rx->l && !rel_is_ref(rx->l) &&
3662 0 : (is_project(rx->op) ||
3663 : is_select(rx->op) ||
3664 : is_join(rx->op)))
3665 : rx = rx->l;
3666 : /* probably we need to introduce a project */
3667 0 : rel_destroy(rel->l);
3668 0 : lx = rel_project(v->sql->sa, rel, rel_projections(v->sql, rel, NULL, 1, 1));
3669 0 : r->l = lx;
3670 0 : rx->l = rel_dup(lx);
3671 : }
3672 : }
3673 188 : return r;
3674 : }
3675 6447600 : exps = rel->exps;
3676 :
3677 : /* push select through join */
3678 6447600 : if (is_select(rel->op) && r && is_join(r->op) && !rel_is_ref(r) && !is_single(r)){
3679 19465 : sql_rel *jl = r->l, *ojl = jl, *jr = r->r, *ojr = jr;
3680 19465 : int left = r->op == op_join || r->op == op_left;
3681 19465 : int right = r->op == op_join || r->op == op_right;
3682 :
3683 19465 : if (r->op == op_full)
3684 : return rel;
3685 :
3686 : /* introduce selects under the join (if needed) */
3687 19443 : set_processed(jl);
3688 19443 : set_processed(jr);
3689 42901 : for (n = exps->h; n;) {
3690 23458 : node *next = n->next;
3691 23458 : sql_exp *e = n->data;
3692 :
3693 23458 : if (!exp_unsafe(e, false, true)) {
3694 23252 : if (left && rel_rebind_exp(v->sql, jl, e)) {
3695 11878 : if (!is_select(jl->op) || rel_is_ref(jl))
3696 9763 : r->l = jl = rel_select(v->sql->sa, jl, NULL);
3697 11878 : rel_select_add_exp(v->sql->sa, jl, e);
3698 11878 : list_remove_node(exps, NULL, n);
3699 11878 : v->changes++;
3700 11374 : } else if (right && rel_rebind_exp(v->sql, jr, e)) {
3701 4771 : if (!is_select(jr->op) || rel_is_ref(jr))
3702 4061 : r->r = jr = rel_select(v->sql->sa, jr, NULL);
3703 4771 : rel_select_add_exp(v->sql->sa, jr, e);
3704 4771 : list_remove_node(exps, NULL, n);
3705 4771 : v->changes++;
3706 : }
3707 : }
3708 : n = next;
3709 : }
3710 19443 : if (ojl != jl)
3711 9763 : set_processed(jl);
3712 19443 : if (ojr != jr)
3713 4061 : set_processed(jr);
3714 : }
3715 :
3716 : /* merge select and cross product ? */
3717 6447578 : if (is_select(rel->op) && r && r->op == op_join && !rel_is_ref(r) && !is_single(r) && !exps_have_unsafe(exps, false, true)) {
3718 13130 : for (n = exps->h; n;) {
3719 1752 : node *next = n->next;
3720 1752 : sql_exp *e = n->data;
3721 :
3722 1752 : if (exp_is_join(e, NULL) == 0) {
3723 444 : if (!r->exps)
3724 109 : r->exps = sa_list(v->sql->sa);
3725 444 : append(r->exps, e);
3726 444 : list_remove_node(exps, NULL, n);
3727 444 : v->changes++;
3728 : }
3729 : n = next;
3730 : }
3731 : }
3732 :
3733 6447578 : 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)){
3734 58635 : sql_rel *pl = r->l, *opl = pl;
3735 : /* we cannot push through window functions (for safety I disabled projects over DDL too) */
3736 58635 : if (pl && pl->op != op_ddl && !exps_have_unsafe(r->exps, false, false)) {
3737 : /* introduce selects under the project (if needed) */
3738 42727 : set_processed(pl);
3739 42727 : if (!pl->exps)
3740 413 : pl->exps = sa_list(v->sql->sa);
3741 91410 : for (n = exps->h; n;) {
3742 48683 : node *next = n->next;
3743 48683 : sql_exp *e = n->data, *ne = NULL;
3744 :
3745 : /* can we move it down */
3746 48683 : if (e->type == e_cmp && (ne = exp_push_down_prj(v->sql, e, r, pl)) && ne != e) {
3747 23199 : if (!(is_select(pl->op) && is_join(pl->op) && is_semi(pl->op)) || rel_is_ref(pl))
3748 23199 : r->l = pl = rel_select(v->sql->sa, pl, NULL);
3749 23199 : rel_select_add_exp(v->sql->sa, pl, ne);
3750 23199 : list_remove_node(exps, NULL, n);
3751 23199 : v->changes++;
3752 : }
3753 : n = next;
3754 : }
3755 42727 : if (opl != pl)
3756 16821 : set_processed(pl);
3757 : }
3758 :
3759 : /* push filters if they match the partition by key on a window function */
3760 1631 : else if (pl && pl->op != op_ddl && exps_have_unsafe(r->exps, false, false)) {
3761 1631 : set_processed(pl);
3762 : /* list of partition by key columns */
3763 1631 : list *keyColumns = get_partition_by_key_columns(v->sql->sa, r);
3764 :
3765 : /* partition by keys found, check if any filter matches them */
3766 1631 : if (keyColumns) {
3767 325 : for (n = exps->h; n;) {
3768 191 : node *next = n->next;
3769 191 : sql_exp *e = n->data, *ne = NULL;
3770 :
3771 191 : if (e->type == e_cmp) {
3772 : /* simple comparison filter */
3773 191 : if (e->flag == cmp_gt || e->flag == cmp_gte || e->flag == cmp_lte || e->flag == cmp_lt
3774 191 : || e->flag == cmp_equal || e->flag == cmp_notequal || e->flag == cmp_in || e->flag == cmp_notin
3775 5 : || (e->flag == cmp_filter && ((list*)e->l)->cnt == 1)) {
3776 187 : sql_exp* column;
3777 : /* the column in 'like' filters is stored inside a list */
3778 187 : if (e->flag == cmp_filter) {
3779 1 : column = ((list*)e->l)->h->data;
3780 : } else {
3781 186 : column = e->l;
3782 : }
3783 :
3784 : /* check if the expression matches any partition by key, meaning we can
3785 : try to safely push it down */
3786 187 : if (filter_column_in_partition_by_columns(column, keyColumns)) {
3787 9 : ne = exp_push_down_prj(v->sql, e, r, pl);
3788 :
3789 : /* can we move it down */
3790 9 : if (ne && ne != e && pl->exps) {
3791 9 : if (!is_select(pl->op) || rel_is_ref(pl))
3792 8 : r->l = pl = rel_select(v->sql->sa, pl, NULL);
3793 9 : rel_select_add_exp(v->sql->sa, pl, ne);
3794 9 : list_remove_node(exps, NULL, n);
3795 9 : v->changes++;
3796 : }
3797 : }
3798 : }
3799 : }
3800 : n = next;
3801 : }
3802 :
3803 : /* cleanup list */
3804 134 : list_destroy(keyColumns);
3805 : }
3806 : }
3807 : }
3808 :
3809 : /* try push select under set relation */
3810 6447578 : if (is_select(rel->op) && r && is_set(r->op) && !list_empty(r->exps) && !rel_is_ref(r) && !is_single(r) && !list_empty(exps)) {
3811 19 : sql_rel *u = r, *ul = u->l, *ur = u->r;
3812 :
3813 19 : ul = rel_dup(ul);
3814 19 : ur = rel_dup(ur);
3815 19 : if (!is_project(ul->op))
3816 0 : ul = rel_project(v->sql->sa, ul,
3817 : rel_projections(v->sql, ul, NULL, 1, 1));
3818 19 : if (!is_project(ur->op))
3819 0 : ur = rel_project(v->sql->sa, ur,
3820 : rel_projections(v->sql, ur, NULL, 1, 1));
3821 19 : rel_rename_exps(v->sql, u->exps, ul->exps);
3822 19 : rel_rename_exps(v->sql, u->exps, ur->exps);
3823 :
3824 : /* introduce selects under the set */
3825 19 : ul = rel_select(v->sql->sa, ul, NULL);
3826 19 : ul->exps = exps_copy(v->sql, exps);
3827 19 : set_processed(ul);
3828 19 : ur = rel_select(v->sql->sa, ur, NULL);
3829 19 : ur->exps = exps_copy(v->sql, exps);
3830 19 : set_processed(ur);
3831 :
3832 19 : rel = rel_inplace_setop(v->sql, rel, ul, ur, u->op, rel_projections(v->sql, rel, NULL, 1, 1));
3833 19 : if (need_distinct(u))
3834 0 : set_distinct(rel);
3835 19 : v->changes++;
3836 : }
3837 6447578 : if (is_select(rel->op) && r && is_munion(r->op) && !list_empty(r->exps) && !rel_is_ref(r) && !is_single(r) && !list_empty(exps)) {
3838 4329 : sql_rel *u = r;
3839 4329 : list *rels = u->l, *nrels = sa_list(v->sql->sa);
3840 13013 : for(node *n = rels->h; n; n = n->next) {
3841 8684 : sql_rel *ul = n->data;
3842 8684 : ul = rel_dup(ul);
3843 8684 : if (!is_project(ul->op))
3844 8 : ul = rel_project(v->sql->sa, ul,
3845 : rel_projections(v->sql, ul, NULL, 1, 1));
3846 8684 : rel_rename_exps(v->sql, u->exps, ul->exps);
3847 :
3848 : /* introduce selects under the set */
3849 8684 : ul = rel_select(v->sql->sa, ul, NULL);
3850 8684 : ul->exps = exps_copy(v->sql, exps);
3851 8684 : set_processed(ul);
3852 8684 : nrels = append(nrels, ul);
3853 : }
3854 :
3855 4329 : rel = rel_inplace_setop_n_ary(v->sql, rel, nrels, u->op, rel_projections(v->sql, rel, NULL, 1, 1));
3856 4329 : if (need_distinct(u))
3857 8 : set_distinct(rel);
3858 4329 : v->changes++;
3859 : }
3860 :
3861 6447578 : return try_remove_empty_select(v, rel);
3862 : }
3863 :
3864 : static int
3865 12033 : index_exp(sql_exp *e, sql_idx *i)
3866 : {
3867 12033 : if (e->type == e_cmp && !is_complex_exp(e->flag)) {
3868 6776 : switch(i->type) {
3869 6776 : case hash_idx:
3870 : case oph_idx:
3871 6776 : if (e->flag == cmp_equal)
3872 : return 0;
3873 : /* fall through */
3874 : case join_idx:
3875 : default:
3876 1252 : return -1;
3877 : }
3878 : }
3879 : return -1;
3880 : }
3881 :
3882 : /* find column for the select/join expression */
3883 : static sql_column *
3884 5524 : sjexp_col(sql_exp *e, sql_rel *r)
3885 : {
3886 5524 : sql_column *res = NULL;
3887 :
3888 5524 : if (e->type == e_cmp && !is_complex_exp(e->flag)) {
3889 5524 : res = exp_find_column(r, e->l, -2);
3890 5524 : if (!res)
3891 466 : res = exp_find_column(r, e->r, -2);
3892 : }
3893 5524 : return res;
3894 : }
3895 :
3896 : static sql_idx *
3897 1686666 : find_index(allocator *sa, sql_rel *rel, sql_rel *sub, list **EXPS)
3898 : {
3899 1686666 : node *n;
3900 :
3901 : /* any (partial) match of the expressions with the index columns */
3902 : /* Depending on the index type we may need full matches and only
3903 : limited number of cmp types (hash only equality etc) */
3904 : /* Depending on the index type we should (in the rel_bin) generate
3905 : more code, ie for spatial index add post filter etc, for hash
3906 : compute hash value and use index */
3907 :
3908 1686666 : if (sub->exps && rel->exps)
3909 6674398 : for(n = sub->exps->h; n; n = n->next) {
3910 5163689 : prop *p;
3911 5163689 : sql_exp *e = n->data;
3912 :
3913 5163689 : if ((p = find_prop(e->p, PROP_HASHIDX)) != NULL) {
3914 9408 : list *exps, *cols;
3915 9408 : sql_idx *i = p->value.pval;
3916 9408 : fcmp cmp = (fcmp)&sql_column_kc_cmp;
3917 :
3918 : /* join indices are only interesting for joins */
3919 9408 : if (i->type == join_idx || list_length(i->columns) <= 1)
3920 0 : continue;
3921 : /* based on the index type, find qualifying exps */
3922 9408 : exps = list_select(rel->exps, i, (fcmp) &index_exp, (fdup)NULL);
3923 9408 : if (list_empty(exps))
3924 4848 : continue;
3925 : /* now we obtain the columns, move into sql_column_kc_cmp! */
3926 4560 : cols = list_map(exps, sub, (fmap) &sjexp_col);
3927 :
3928 : /* TODO check that at most 2 relations are involved */
3929 :
3930 : /* Match the index columns with the expression columns.
3931 : TODO, Allow partial matches ! */
3932 4560 : if (list_match(cols, i->columns, cmp) == 0) {
3933 : /* re-order exps in index order */
3934 286 : node *n, *m;
3935 286 : list *es = sa_list(sa);
3936 :
3937 958 : for(n = i->columns->h; n; n = n->next) {
3938 672 : int i = 0;
3939 2152 : for(m = cols->h; m; m = m->next, i++) {
3940 2152 : if (cmp(m->data, n->data) == 0){
3941 672 : sql_exp *e = list_fetch(exps, i);
3942 672 : list_append(es, e);
3943 672 : break;
3944 : }
3945 : }
3946 : }
3947 : /* fix the destroy function */
3948 286 : cols->destroy = NULL;
3949 286 : *EXPS = es;
3950 286 : e->used = 1;
3951 286 : return i;
3952 : }
3953 4274 : cols->destroy = NULL;
3954 : }
3955 : }
3956 : return NULL;
3957 : }
3958 :
3959 : static inline sql_rel *
3960 1102232 : rel_use_index(visitor *v, sql_rel *rel)
3961 : {
3962 1102232 : list *exps = NULL;
3963 1102232 : sql_idx *i = find_index(v->sql->sa, rel, rel->l, &exps);
3964 1102232 : int left = 1;
3965 :
3966 1102232 : assert(is_select(rel->op) || is_join(rel->op));
3967 1102232 : if (!i && is_join(rel->op)) {
3968 584434 : left = 0;
3969 584434 : i = find_index(v->sql->sa, rel, rel->r, &exps);
3970 : }
3971 :
3972 1102052 : if (i) {
3973 286 : prop *p;
3974 286 : node *n;
3975 286 : int single_table = 1;
3976 286 : sql_exp *re = NULL;
3977 :
3978 956 : for( n = exps->h; n && single_table; n = n->next) {
3979 670 : sql_exp *e = n->data, *nre = e->l;
3980 :
3981 670 : if (!is_compare(e->type) || is_anti(e) || e->flag != cmp_equal)
3982 : return rel;
3983 670 : if (is_join(rel->op) && ((left && !rel_find_exp(rel->l, nre)) || (!left && rel_find_exp(rel->r, nre))))
3984 111 : nre = e->r;
3985 670 : single_table = (!re || (exp_relname(nre) && exp_relname(re) && strcmp(exp_relname(nre), exp_relname(re)) == 0));
3986 670 : re = nre;
3987 : }
3988 286 : if (single_table) { /* add PROP_HASHCOL to all column exps */
3989 932 : for( n = exps->h; n; n = n->next) {
3990 654 : sql_exp *e = n->data;
3991 :
3992 : /* swapped ? */
3993 654 : if (is_join(rel->op) && ((left && !rel_find_exp(rel->l, e->l)) || (!left && !rel_find_exp(rel->r, e->l)))) {
3994 165 : exp_swap(e);
3995 : }
3996 654 : p = find_prop(e->p, PROP_HASHCOL);
3997 654 : if (!p)
3998 285 : e->p = p = prop_create(v->sql->sa, PROP_HASHCOL, e->p);
3999 654 : p->value.pval = i;
4000 : }
4001 : }
4002 : /* add the remaining exps to the new exp list */
4003 286 : if (list_length(rel->exps) > list_length(exps)) {
4004 108 : for( n = rel->exps->h; n; n = n->next) {
4005 81 : sql_exp *e = n->data;
4006 81 : if (!list_find(exps, e, (fcmp)&exp_cmp))
4007 27 : list_append(exps, e);
4008 : }
4009 : }
4010 286 : rel->exps = exps;
4011 : }
4012 : return rel;
4013 : }
4014 :
4015 : static sql_rel *
4016 3444343 : rel_select_leftgroup_2_semi(visitor *v, sql_rel *rel)
4017 : {
4018 3444343 : if (rel_is_ref(rel) || !is_select(rel->op) || list_empty(rel->exps))
4019 2936761 : return rel;
4020 507582 : sql_rel *l = rel->l;
4021 :
4022 507582 : if (!l || rel_is_ref(l) || !is_left(l->op) || list_empty(l->attr))
4023 506596 : return rel;
4024 :
4025 1964 : for(node *n = rel->exps->h; n; n = n->next) {
4026 986 : sql_exp *e = n->data;
4027 :
4028 986 : if (e->type == e_cmp && !is_semantics(e) && !e->f) {
4029 973 : list *attrs = l->attr;
4030 973 : sql_exp *a = attrs->h->data;
4031 :
4032 973 : if (exps_find_exp(l->attr, e->l) && exp_is_true(e->r) && e->flag == cmp_equal /*&& exp_is_true(a)*/) {
4033 : // printf("# optimize select leftgroup -> semi\n");
4034 8 : if (!list_empty(l->exps)) {
4035 13 : for(node *m = l->exps->h; m; m = m->next) {
4036 7 : sql_exp *j = m->data;
4037 7 : reset_any(j);
4038 : }
4039 : }
4040 8 : l->attr = NULL;
4041 8 : l->op = exp_is_true(a)?op_semi:op_anti;
4042 8 : list_remove_node(rel->exps, NULL, n);
4043 8 : rel = rel_project(v->sql->sa, rel, rel_projections(v->sql, rel, NULL, 1, 1));
4044 8 : list_append(rel->exps, attrs->h->data);
4045 8 : v->changes++;
4046 8 : return rel;
4047 : }
4048 : }
4049 : }
4050 : return rel;
4051 : }
4052 :
4053 : static sql_rel *
4054 3444343 : rel_optimize_select_and_joins_topdown_(visitor *v, sql_rel *rel)
4055 : {
4056 : /* push_join_down introduces semijoins */
4057 3444343 : uint8_t cycle = *(uint8_t*) v->data;
4058 3444343 : if (cycle <= 0) {
4059 1521081 : rel = rel_semijoin_use_fk(v, rel);
4060 1521081 : rel = rel_push_join_down(v, rel);
4061 : }
4062 :
4063 3444343 : rel = rel_simplify_fk_joins(v, rel);
4064 3444343 : rel = rel_push_select_down(v, rel);
4065 3444343 : rel = rel_select_leftgroup_2_semi(v, rel);
4066 3444343 : if (rel && rel->l && (is_select(rel->op) || is_join(rel->op)))
4067 1102232 : rel = rel_use_index(v, rel);
4068 3444343 : return rel;
4069 : }
4070 :
4071 : static sql_rel *
4072 114893 : rel_optimize_select_and_joins_topdown(visitor *v, global_props *gp, sql_rel *rel)
4073 : {
4074 114893 : v->data = &gp->opt_cycle;
4075 114893 : rel = rel_visitor_topdown(v, rel, &rel_optimize_select_and_joins_topdown_);
4076 114893 : v->data = gp;
4077 114893 : return rel;
4078 : }
4079 :
4080 : run_optimizer
4081 612289 : bind_optimize_select_and_joins_topdown(visitor *v, global_props *gp)
4082 : {
4083 612289 : int flag = v->sql->sql_optimizer;
4084 612093 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
4085 534587 : || gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti] ||
4086 1224382 : gp->cnt[op_select]) && (flag & optimize_select_and_joins_topdown) ? rel_optimize_select_and_joins_topdown : NULL;
4087 : }
4088 :
4089 :
4090 : static int
4091 1173280 : can_push_func(sql_exp *e, sql_rel *rel, int *must, int depth)
4092 : {
4093 1212461 : switch(e->type) {
4094 1028084 : case e_cmp: {
4095 1028084 : sql_exp *l = e->l, *r = e->r, *f = e->f;
4096 :
4097 : /* don't push down functions inside attribute joins */
4098 1028084 : if (e->flag == cmp_or || e->flag == cmp_in || e->flag == cmp_notin || e->flag == cmp_filter || (is_join(rel->op) && is_any(e)))
4099 : return 0;
4100 973146 : if (depth > 0) { /* for comparisons under the top ones, they become functions */
4101 58 : int lmust = 0;
4102 58 : int res = can_push_func(l, rel, &lmust, depth + 1) && can_push_func(r, rel, &lmust, depth + 1) &&
4103 20 : (!f || can_push_func(f, rel, &lmust, depth + 1));
4104 12 : if (res && !lmust)
4105 : return 1;
4106 54 : (*must) |= lmust;
4107 54 : return res;
4108 : } else {
4109 973088 : int mustl = 0, mustr = 0, mustf = 0;
4110 973088 : return ((l->type == e_column || can_push_func(l, rel, &mustl, depth + 1)) && (*must = mustl)) ||
4111 1939256 : ((r->type == e_column || can_push_func(r, rel, &mustr, depth + 1)) && (*must = mustr)) ||
4112 3648 : ((f && (f->type == e_column || can_push_func(f, rel, &mustf, depth + 1)) && (*must = mustf)));
4113 : }
4114 : }
4115 39181 : case e_convert:
4116 39181 : return can_push_func(e->l, rel, must, depth + 1);
4117 9397 : case e_aggr:
4118 : case e_func: {
4119 9397 : list *l = e->l;
4120 9397 : int res = 1, lmust = 0;
4121 :
4122 9397 : if (exp_unsafe(e, false, false))
4123 : return 0;
4124 26781 : if (l) for (node *n = l->h; n && res; n = n->next)
4125 17384 : res &= can_push_func(n->data, rel, &lmust, depth + 1);
4126 9397 : if (res && !lmust)
4127 : return 1;
4128 8550 : (*must) |= lmust;
4129 8550 : return res;
4130 : }
4131 45453 : case e_column:
4132 45453 : if (rel && !rel_find_exp(rel, e))
4133 : return 0;
4134 27165 : (*must) = 1;
4135 : /* fall through */
4136 : default:
4137 : return 1;
4138 : }
4139 : }
4140 :
4141 : static int
4142 855090 : exps_can_push_func(list *exps, sql_rel *rel)
4143 : {
4144 3622846 : for(node *n = exps->h; n; n = n->next) {
4145 2789080 : sql_exp *e = n->data;
4146 2789080 : int mustl = 0, mustr = 0;
4147 :
4148 2789080 : if ((is_joinop(rel->op) || is_select(rel->op)) && ((can_push_func(e, rel->l, &mustl, 0) && mustl)))
4149 21324 : return 1;
4150 2784889 : if (is_joinop(rel->op) && can_push_func(e, rel->r, &mustr, 0) && mustr)
4151 : return 1;
4152 : }
4153 : return 0;
4154 : }
4155 :
4156 : static int
4157 74711 : exp_needs_push_down(sql_rel *rel, sql_exp *e)
4158 : {
4159 96693 : switch(e->type) {
4160 25088 : case e_cmp:
4161 : /* don't push down functions inside attribute joins */
4162 25088 : if (e->flag == cmp_or || e->flag == cmp_in || e->flag == cmp_notin || e->flag == cmp_filter || (is_join(rel->op) && is_any(e)))
4163 : return 0;
4164 24153 : return exp_needs_push_down(rel, e->l) || exp_needs_push_down(rel, e->r) || (e->f && exp_needs_push_down(rel, e->f));
4165 21982 : case e_convert:
4166 21982 : return exp_needs_push_down(rel, e->l);
4167 1900 : case e_aggr:
4168 : case e_func:
4169 1900 : if (!e->l || exps_are_atoms(e->l))
4170 20 : return 0;
4171 : return 1;
4172 1455 : case e_atom:
4173 1455 : if (!e->f || exps_are_atoms(e->f))
4174 1455 : return 0;
4175 : return 1;
4176 : case e_column:
4177 : default:
4178 : return 0;
4179 : }
4180 : }
4181 :
4182 : static int
4183 21324 : exps_need_push_down(sql_rel *rel, list *exps )
4184 : {
4185 44524 : for(node *n = exps->h; n; n = n->next)
4186 25080 : if (exp_needs_push_down(rel, n->data))
4187 : return 1;
4188 : return 0;
4189 : }
4190 :
4191 : static sql_exp *exp_push_single_func_down(visitor *v, sql_rel *rel, sql_rel *ol, sql_rel *or, sql_exp *e, int depth);
4192 :
4193 : static list *
4194 2392 : exps_push_single_func_down(visitor *v, sql_rel *rel, sql_rel *ol, sql_rel *or, list *exps, int depth)
4195 : {
4196 4784 : if (mvc_highwater(v->sql))
4197 : return exps;
4198 :
4199 6674 : for (node *n = exps->h; n; n = n->next)
4200 4282 : if ((n->data = exp_push_single_func_down(v, rel, ol, or, n->data, depth)) == NULL)
4201 : return NULL;
4202 : return exps;
4203 : }
4204 :
4205 : static sql_exp *
4206 15631 : exp_push_single_func_down(visitor *v, sql_rel *rel, sql_rel *ol, sql_rel *or, sql_exp *e, int depth)
4207 : {
4208 27325 : if (mvc_highwater(v->sql))
4209 : return e;
4210 :
4211 15631 : switch(e->type) {
4212 4219 : case e_cmp: {
4213 4219 : if (e->flag == cmp_or || e->flag == cmp_filter) {
4214 247 : if ((e->l = exps_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4215 : return NULL;
4216 247 : if ((e->r = exps_push_single_func_down(v, rel, ol, or, e->r, depth + 1)) == NULL)
4217 : return NULL;
4218 3972 : } else if (e->flag == cmp_in || e->flag == cmp_notin) {
4219 18 : if ((e->l = exp_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4220 : return NULL;
4221 18 : if ((e->r = exps_push_single_func_down(v, rel, ol, or, e->r, depth + 1)) == NULL)
4222 : return NULL;
4223 : } else {
4224 3954 : if ((e->l = exp_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4225 : return NULL;
4226 3954 : if ((e->r = exp_push_single_func_down(v, rel, ol, or, e->r, depth + 1)) == NULL)
4227 : return NULL;
4228 3954 : if (e->f && (e->f = exp_push_single_func_down(v, rel, ol, or, e->f, depth + 1)) == NULL)
4229 : return NULL;
4230 : }
4231 : } break;
4232 1988 : case e_convert:
4233 1988 : if ((e->l = exp_push_single_func_down(v, rel, ol, or, e->l, depth + 1)) == NULL)
4234 : return NULL;
4235 : break;
4236 3960 : case e_aggr:
4237 : case e_func: {
4238 3960 : sql_rel *l = rel->l, *r = rel->r;
4239 3960 : int must = 0, mustl = 0, mustr = 0;
4240 :
4241 3960 : if (exp_unsafe(e, false, false))
4242 23 : return e;
4243 3960 : if (!e->l || exps_are_atoms(e->l))
4244 23 : return e;
4245 3937 : if ((is_joinop(rel->op) && ((can_push_func(e, l, &mustl, depth + 1) && mustl) || (can_push_func(e, r, &mustr, depth + 1) && mustr))) ||
4246 2971 : (is_select(rel->op) && can_push_func(e, l, &must, depth + 1) && must)) {
4247 3924 : exp_label(v->sql->sa, e, ++v->sql->label);
4248 : /* we need a full projection, group by's and unions cannot be extended with more expressions */
4249 3924 : if (mustr) {
4250 352 : if (r == or) /* don't project twice */
4251 329 : rel->r = r = rel_project(v->sql->sa, r, rel_projections(v->sql, r, NULL, 1, 1));
4252 352 : list_append(r->exps, e);
4253 : } else {
4254 3572 : if (l == ol) /* don't project twice */
4255 1816 : rel->l = l = rel_project(v->sql->sa, l, rel_projections(v->sql, l, NULL, 1, 1));
4256 3572 : list_append(l->exps, e);
4257 : }
4258 3924 : e = exp_ref(v->sql, e);
4259 3924 : v->changes++;
4260 : }
4261 3937 : } break;
4262 1144 : case e_atom: {
4263 1144 : if (e->f && (e->f = exps_push_single_func_down(v, rel, ol, or, e->f, depth + 1)) == NULL)
4264 : return NULL;
4265 : } break;
4266 : case e_column:
4267 : case e_psm:
4268 : break;
4269 : }
4270 : return e;
4271 : }
4272 :
4273 : static inline sql_rel *
4274 3367262 : rel_push_func_down(visitor *v, sql_rel *rel)
4275 : {
4276 3367262 : if ((is_select(rel->op) || is_joinop(rel->op)) && rel->l && rel->exps && !(rel_is_ref(rel))) {
4277 1027163 : int changes = v->changes;
4278 1027163 : sql_rel *l = rel->l, *r = rel->r;
4279 :
4280 : /* only push down when is useful */
4281 1027163 : if ((is_select(rel->op) && list_length(rel->exps) <= 1) || rel_is_ref(l) || (is_joinop(rel->op) && rel_is_ref(r)))
4282 504722 : return rel;
4283 522441 : 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))
4284 : return NULL;
4285 522441 : if (v->changes > changes) /* once we get a better join order, we can try to remove this projection */
4286 1880 : return rel_project(v->sql->sa, rel, rel_projections(v->sql, rel, NULL, 1, 1));
4287 : }
4288 2860660 : if (is_simple_project(rel->op) && rel->l && rel->exps) {
4289 1046437 : sql_rel *pl = rel->l;
4290 :
4291 1046437 : if (is_joinop(pl->op) && exps_can_push_func(rel->exps, rel)) {
4292 0 : sql_rel *l = pl->l, *r = pl->r, *ol = l, *or = r;
4293 :
4294 0 : for (node *n = rel->exps->h; n; ) {
4295 0 : node *next = n->next;
4296 0 : sql_exp *e = n->data;
4297 0 : int mustl = 0, mustr = 0;
4298 :
4299 0 : if ((can_push_func(e, l, &mustl, 0) && mustl) || (can_push_func(e, r, &mustr, 0) && mustr)) {
4300 0 : if (mustl) {
4301 0 : if (l == ol) /* don't project twice */
4302 0 : pl->l = l = rel_project(v->sql->sa, l, rel_projections(v->sql, l, NULL, 1, 1));
4303 0 : list_append(l->exps, e);
4304 0 : list_remove_node(rel->exps, NULL, n);
4305 0 : v->changes++;
4306 : } else {
4307 0 : if (r == or) /* don't project twice */
4308 0 : pl->r = r = rel_project(v->sql->sa, r, rel_projections(v->sql, r, NULL, 1, 1));
4309 0 : list_append(r->exps, e);
4310 0 : list_remove_node(rel->exps, NULL, n);
4311 0 : v->changes++;
4312 : }
4313 : }
4314 0 : n = next;
4315 : }
4316 : }
4317 : }
4318 : return rel;
4319 : }
4320 :
4321 : static sql_rel *
4322 3367262 : rel_push_func_and_select_down_(visitor *v, sql_rel *rel)
4323 : {
4324 3367262 : if (rel)
4325 3367262 : rel = rel_push_func_down(v, rel);
4326 3367262 : if (rel)
4327 3367262 : rel = rel_push_select_down(v, rel);
4328 3367262 : return rel;
4329 : }
4330 :
4331 : static sql_rel *
4332 114893 : rel_push_func_and_select_down(visitor *v, global_props *gp, sql_rel *rel)
4333 : {
4334 114893 : (void) gp;
4335 114893 : return rel_visitor_topdown(v, rel, &rel_push_func_and_select_down_);
4336 : }
4337 :
4338 : run_optimizer
4339 612287 : bind_push_func_and_select_down(visitor *v, global_props *gp)
4340 : {
4341 612287 : int flag = v->sql->sql_optimizer;
4342 612091 : return gp->opt_level == 1 && (gp->cnt[op_join] || gp->cnt[op_left] || gp->cnt[op_right]
4343 534585 : || gp->cnt[op_full] || gp->cnt[op_semi] || gp->cnt[op_anti] || gp->cnt[op_select])
4344 727180 : && (flag & push_func_and_select_down) ? rel_push_func_and_select_down : NULL;
4345 : }
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