MonetDB: default - Minor speed improvement

[mk]

Changeset: 3a8a02508c78 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=3a8a02508c78
Modified Files:
        monetdb5/optimizer/opt_joinpath.mx
Branch: default
Log Message:

Minor speed improvement


diffs (26 lines):

diff --git a/monetdb5/optimizer/opt_joinpath.mx 
b/monetdb5/optimizer/opt_joinpath.mx
--- a/monetdb5/optimizer/opt_joinpath.mx
+++ b/monetdb5/optimizer/opt_joinpath.mx
@@ -164,11 +164,12 @@
        for(i=0, p= getInstrPtr(mb, i); i< limit; i++, p= getInstrPtr(mb, i))
                if ( getFunctionId(p)== joinPathRef || getFunctionId(p)== 
leftjoinPathRef || getFunctionId(p) == semijoinPathRef)
                        for ( j= p->retc; j< p->argc-1; j++){
-                               for (k= 0; k < top; k++)
+                               for (k= top-1; k >= 0 ; k--)
                                        if ( candidate[k].lvar == getArg(p,j) 
&& candidate[k].rvar == getArg(p,j+1) && candidate[k].fcn == getFunctionId(p)){
                                                candidate[k].cnt++;
                                                break;
                                        }
+                               if (k < 0) k = top;
                                if ( k == top && top < mb->stop ){
                                        candidate[k].cnt =1;
                                        candidate[k].lvar = getArg(p,j);
@@ -193,7 +194,7 @@
        for(i=0, p= old[i]; i< limit; i++, p= old[i]) {
                if( getFunctionId(p)== joinPathRef || getFunctionId(p)== 
leftjoinPathRef || getFunctionId(p) == semijoinPathRef)
                        for ( j= p->retc ; j< p->argc-1; j++){
-                               for (k= 0; k < top; k++)
+                               for (k= top-1; k >= 0 ; k--)
                                        if ( candidate[k].lvar == getArg(p,j) 
&& candidate[k].rvar == getArg(p,j+1) && candidate[k].fcn == getFunctionId(p) 
&& candidate[k].cnt > 1){
                                                if ( candidate[k].p == 0 ) {
                                                        if ( candidate[k].fcn 
== joinPathRef)
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