[Monetdb-developers] about MAL optimize

Stefan Manegold Stefan.Manegold at cwi.nl
Wed Aug 11 10:15:51 CEST 2010


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 at 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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| Dr. Stefan Manegold | mailto:Stefan.Manegold at cwi.nl |
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