Update of /cvsroot/monetdb/pathfinder/compiler/algebra/prop
In directory
23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv29915/compiler/algebra/prop
Modified Files:
prop_set.c
Log Message:
propagated changes of Tuesday Jul 07 2009 - Wednesday Jul 08 2009
from the May2009 branch to the development trunk
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2009/07/07 - tsheyar: compiler/algebra/prop/prop_set.c,1.31.2.1
-- 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 1.32
retrieving revision 1.33
diff -u -d -r1.32 -r1.33
--- prop_set.c 12 Jun 2009 13:06:14 -0000 1.32
+++ prop_set.c 8 Jul 2009 11:21:40 -0000 1.33
@@ -145,11 +145,17 @@
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:
l_set = true;
break;
@@ -377,7 +383,6 @@
break;
case la_semijoin:
- case la_difference:
/* adopt set information for left argument
and allow duplicates in the right argument */
r_col = col_NULL;
@@ -413,6 +418,15 @@
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:
/* allow duplicates for the argument */
l_col = col_NULL;
------------------------------------------------------------------------------
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