Update of /cvsroot/monetdb/MonetDB5/src/optimizer
In directory sc8-pr-cvs16.sourceforge.net:/tmp/cvs-serv3981
Modified Files:
opt_joinpath.mx
Log Message:
Revert the change to the optimizer.
The SQL code generator produces a sequence that is not by default
re-usable. We should introduce a post optimization step after determining
all joinpaths to detect common subpaths.
Index: opt_joinpath.mx
===================================================================
RCS file: /cvsroot/monetdb/MonetDB5/src/optimizer/opt_joinpath.mx,v
retrieving revision 1.16
retrieving revision 1.17
diff -u -d -r1.16 -r1.17
--- opt_joinpath.mx 25 Jan 2008 12:00:38 -0000 1.16
+++ opt_joinpath.mx 25 Jan 2008 14:19:29 -0000 1.17
@@ -93,12 +93,12 @@
p= getInstrPtr(mb,i);
if( getModuleId(p)== algebraRef && getFunctionId(p)== joinRef ){
@-
-Try to expand each of its argument list
+Try to expand each of its argument list.
@c
q= copyInstruction(p);
q->argc=1;
for(j=p->retc; j<p->argc; j++)
- if( pc[getArg(p,j)] && used[getArg(p,j)]==1 ){
+ if( pc[getArg(p,j)] ){
r= getInstrPtr(mb,pc[getArg(p,j)]);
#ifdef DEBUG_OPT_JOINPATH
stream_printf(GDKout,"expand with \n");
@@ -131,7 +131,11 @@
getHeadType(getArgType(mb,q,j))==
TYPE_oid)
)
goto nochange;
-
[EMAIL PROTECTED]
+Post-optimization. After the join path has been constructed
+it could locate common subpaths with previous ones and factor
+out that processing step. [TODO]
[EMAIL PROTECTED]
setFunctionId(q,joinPathRef);
getInstrPtr(mb,i)=q;
freeInstruction(p);
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