Update of /cvsroot/monetdb/pathfinder/compiler/algebra/prop
In directory
sfp-cvsdas-1.v30.ch3.sourceforge.com:/tmp/cvs-serv22173/algebra/prop
Modified Files:
Tag: Feb2010
prop_set.c
Log Message:
-- Performance fix in set property inference.
Index: prop_set.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/prop/prop_set.c,v
retrieving revision 1.36
retrieving revision 1.36.2.1
diff -u -d -r1.36 -r1.36.2.1
--- prop_set.c 7 Jan 2010 15:24:27 -0000 1.36
+++ prop_set.c 9 Mar 2010 17:19:18 -0000 1.36.2.1
@@ -421,6 +421,18 @@
break;
case la_difference:
+ /* Switch the set property from TRUE to MAYBE (TRUE+col)
+ if there is only a single column col and keep the MAYBE
+ information if it stores the same column name. */
+ if (n->prop->set && n->schema.count == 1) {
+ PFalg_col_t col = n->schema.items[0].name;
+ if ((n->prop->set_col && n->prop->set_col == col) ||
+ !n->prop->set_col) {
+ l_col = col;
+ l_set = true;
+ break;
+ }
+ }
/* the left argument may not prune duplicates
(as this might lead to more result tuples) */
l_set = false;
------------------------------------------------------------------------------
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