Make NestLoop plan nodes pass outer-relation variables into their inner

relation using the general PARAM_EXEC executor parameter mechanism, rather
than the ad-hoc kluge of passing the outer tuple down through ExecReScan.
The previous method was hard to understand and could never be extended to
handle parameters coming from multiple join levels.  This patch doesn't
change the set of possible plans nor have any significant performance effect,
but it's necessary infrastructure for future generalization of the concept
of an inner indexscan plan.

ExecReScan's second parameter is now unused, so it's removed.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/include/executor/nodeHash.h b/src/include/executor/nodeHash.h
index c5e18a93e7d..53348c435fb 100644
--- a/src/include/executor/nodeHash.h
+++ b/src/include/executor/nodeHash.h
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.49 2010/01/02 16:58:03 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/executor/nodeHash.h,v 1.50 2010/07/12 17:01:06 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -20,7 +20,7 @@ extern HashState *ExecInitHash(Hash *node, EState *estate, int eflags);
 extern TupleTableSlot *ExecHash(HashState *node);
 extern Node *MultiExecHash(HashState *node);
 extern void ExecEndHash(HashState *node);
-extern void ExecReScanHash(HashState *node, ExprContext *exprCtxt);
+extern void ExecReScanHash(HashState *node);
 
 extern HashJoinTable ExecHashTableCreate(Hash *node, List *hashOperators);
 extern void ExecHashTableDestroy(HashJoinTable hashtable);