Update of /cvsroot/monetdb/pathfinder/compiler/algebra/opt
In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv18920/compiler/algebra/opt
Modified Files:
Tag: Nov2009
opt_monetxq.c
Log Message:
propagated changes of Wednesday Oct 07 2009
from the Aug2009_NFI branch to the Nov2009 branch
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2009/10/07 - boncz: compiler/algebra/opt/opt_monetxq.c,1.10.8.1
- performance fix in shredder: no more duplicate text node elimination
- performance fix in loop-lifted doc() evaluation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
U opt_monetxq.c
Index: opt_monetxq.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/opt/opt_monetxq.c,v
retrieving revision 1.10
retrieving revision 1.10.6.1
diff -u -d -r1.10 -r1.10.6.1
--- opt_monetxq.c 12 May 2009 16:12:10 -0000 1.10
+++ opt_monetxq.c 7 Oct 2009 15:46:44 -0000 1.10.6.1
@@ -245,6 +245,31 @@
RL(p) = RLL(p);
break;
+ case la_attach:
+ /* If the attach column is the only result it might
+ be benefitial to return only a single row
+ (the attach column without duplicates). */
+ if (PFprop_set (p->prop) &&
+ PFprop_icols_count (p->prop) == 1 &&
+ PFprop_icol (p->prop, p->sem.attach.res)) {
+ PFalg_col_t col = p->sem.attach.res;
+ PFalg_proj_t *proj = PFmalloc (p->schema.count *
+ sizeof (PFalg_proj_t));
+
+ /* fill the projection list of the upper projection (proj) */
+ for (unsigned int i = 0; i < p->schema.count; i++)
+ proj[i] = PFalg_proj (p->schema.items[i].name, col);
+
+ *p = *PFla_project_ (
+ PFla_distinct (
+ PFla_project (
+ PFla_attach (L(p), col, p->sem.attach.value),
+ PFalg_proj (col, col))),
+ p->schema.count,
+ proj);
+ }
+ break;
+
default:
break;
}
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