Update of /cvsroot/monetdb/pathfinder/compiler/algebra/prop
In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv5440/algebra/prop
Modified Files:
Tag: Feb2009
prop_card.c
Log Message:
-- Correctly infer the cardinality for distinct operators.
U prop_card.c
Index: prop_card.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/prop/prop_card.c,v
retrieving revision 1.39
retrieving revision 1.39.2.1
diff -u -d -r1.39 -r1.39.2.1
--- prop_card.c 8 Jan 2009 16:54:10 -0000 1.39
+++ prop_card.c 9 Mar 2009 14:52:39 -0000 1.39.2.1
@@ -81,7 +81,6 @@
case la_pos_select:
case la_intersect:
case la_difference:
- case la_distinct:
case la_step:
case la_step_join:
case la_doc_index_join:
@@ -152,6 +151,14 @@
L(n)->prop->card + R(n)->prop->card : 0;
break;
+ case la_distinct:
+ if (L(n)->prop->card == 1)
+ n->prop->card = 1;
+ else
+ /* can't say something specific about cardinality */
+ n->prop->card = 0;
+ break;
+
case la_to:
/* with constant information
we could infer the cardinality better */
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