Update of /cvsroot/monetdb/pathfinder/compiler/algebra/prop
In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv26443/algebra/prop
Modified Files:
Tag: May2009
prop_set.c
Log Message:
-- Fix set property inference for differences (-- we have bag semantics).
U prop_set.c
Index: prop_set.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/prop/prop_set.c,v
retrieving revision 1.31
retrieving revision 1.31.2.1
diff -u -d -r1.31 -r1.31.2.1
--- prop_set.c 7 May 2009 14:26:25 -0000 1.31
+++ prop_set.c 7 Jul 2009 10:07:04 -0000 1.31.2.1
@@ -149,11 +149,17 @@
break;
case la_semijoin:
- case la_difference:
l_set = n->prop->set;
r_set = true;
break;
+ case la_difference:
+ /* the left argument may not prune duplicates
+ (as this might lead to mor result tuples) */
+ l_set = false;
+ r_set = true;
+ break;
+
case la_distinct:
case la_max:
case la_min:
@@ -365,7 +371,6 @@
break;
case la_semijoin:
- case la_difference:
/* adopt set information for left argument
and allow duplicates in the right argument */
r_col = col_NULL;
@@ -401,6 +406,15 @@
l_set = false;
break;
+ case la_difference:
+ /* the left argument may not prune duplicates
+ (as this might lead to mor result tuples) */
+ l_set = false;
+ /* and allow duplicates in the right argument */
+ r_col = col_NULL;
+ r_set = true;
+ break;
+
case la_distinct:
case la_max:
case la_min:
------------------------------------------------------------------------------
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