Yes, if you write MAL "by hand" (or have some program create it) that does explicitly call a MAL optimizer, that MAL optimizer is indeed used to optimize the MAL code according to its very purpose. Stefan On Wed, Aug 11, 2010 at 03:49:47PM +0800, kun ren wrote:
It is only used by SQL? and how to designation the optimiser？but when I write MAL,for example, i:=0; b:= "done"; barrier go:= true; c:=i+1; d:="step"; v:=d; io.print(v); i:=c; redo go:= i<2; exit go; io.print(b); optimizer.aliasRemoval();
the last optimizer.aliasRemoval() is used for optimizing?
2010/8/11 Fabian Groffen
Recently,I am intersting in MAL optimize，and have read the manual of
On 11-08-2010 15:25:15 +0800, kun ren wrote: the
MAL optimize, but it is so long, Possible if we want to use mal optimize ,we must degignation the optimize consideration, such as alias removal, constant expression,join path optimizer;And then I dedug the MonetDB,but default it don't use any optimize.so what do you think about the mal optimize?
It is only used when you use SQL. The sql_optimizer setting in monetdb5.conf controls which optimisers are run, which by default are quite a few.
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