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 Fabian.Groffen@cwi.nl
On 11-08-2010 15:25:15 +0800, kun ren wrote:
Recently,I am intersting in MAL optimize,and have read the manual of
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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