Update of /cvsroot/monetdb/pathfinder/compiler/algebra/map
In directory sc8-pr-cvs16:/tmp/cvs-serv25318/algebra/map
Modified Files:
intro_proxy.c
Log Message:
-- Bugfix: avoid to list a column in a projection twice.
Index: intro_proxy.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/map/intro_proxy.c,v
retrieving revision 1.25
retrieving revision 1.26
diff -u -d -r1.25 -r1.26
--- intro_proxy.c 7 May 2007 10:17:08 -0000 1.25
+++ intro_proxy.c 7 May 2007 11:23:38 -0000 1.26
@@ -2104,6 +2104,25 @@
/* adjust the count */
req_cols.count = count;
+ /* We are certain that this join is only a mapping join
+ (see join_entry ()). Any input column (at the proxy base)
+ that is propagated along the left *and* the right side
+ of the equi-join and which is not modified contains
+ the same values and can be pruned from the entry_proj
+ projection list. Here we can prune one of its occurrences
+ in the above renaming projection list. */
+ for (i = 0; i < dist_count; i++)
+ for (j = i+1; j < dist_count; j++)
+ if (entry_proj[i].new == entry_proj[j].new) {
+ /* copy the last projection pair to the
+ current column that appears twice */
+ dist_count--;
+ entry_proj[i] = entry_proj[dist_count];
+ proxy_proj[i] = proxy_proj[dist_count];
+ i--;
+ break;
+ }
+
/* Rebuild the proxy entry operator and extend it with a projection
that maps the resulting column names to the names of the proxy
base. In addition map the old key column to the resulting relation
-------------------------------------------------------------------------
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