>
> 2010/8/11 Stefan Manegold <
Stefan.Manegold@cwi.nl>
>
> > 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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> > --
> > | Dr. Stefan Manegold | mailto:
Stefan.Manegold@cwi.nl |
> > | CWI, P.O.Box 94079 |
http://www.cwi.nl/~manegold/ |
> > | 1090 GB Amsterdam | Tel.: +31 (20) 592-4212 |
> > | The Netherlands | Fax : +31 (20) 592-4199 |
> >