Extend the ExecInitNode API so that plan nodes receive a set of flag

bits indicating which optional capabilities can actually be exercised
at runtime.  This will allow Sort and Material nodes, and perhaps later
other nodes, to avoid unnecessary overhead in common cases.
This commit just adds the infrastructure and arranges to pass the correct
flag values down to plan nodes; none of the actual optimizations are here
yet.  I'm committing this separately in case anyone wants to measure the
added overhead.  (It should be negligible.)

Simon Riggs and Tom Lane

1 files changed, 6 insertions, 3 deletions

diff --git a/src/backend/executor/nodeBitmapAnd.c b/src/backend/executor/nodeBitmapAnd.c
index a9e63cbfccb..8218ecfb9de 100644
--- a/src/backend/executor/nodeBitmapAnd.c
+++ b/src/backend/executor/nodeBitmapAnd.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/executor/nodeBitmapAnd.c,v 1.4 2005/10/15 02:49:17 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/executor/nodeBitmapAnd.c,v 1.5 2006/02/28 04:10:27 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -40,7 +40,7 @@
  * ----------------------------------------------------------------
  */
 BitmapAndState *
-ExecInitBitmapAnd(BitmapAnd *node, EState *estate)
+ExecInitBitmapAnd(BitmapAnd *node, EState *estate, int eflags)
 {
 	BitmapAndState *bitmapandstate = makeNode(BitmapAndState);
 	PlanState **bitmapplanstates;
@@ -49,6 +49,9 @@ ExecInitBitmapAnd(BitmapAnd *node, EState *estate)
 	ListCell   *l;
 	Plan	   *initNode;
 
+	/* check for unsupported flags */
+	Assert(!(eflags & (EXEC_FLAG_BACKWARD | EXEC_FLAG_MARK)));
+
 	CXT1_printf("ExecInitBitmapAnd: context is %d\n", CurrentMemoryContext);
 
 	/*
@@ -83,7 +86,7 @@ ExecInitBitmapAnd(BitmapAnd *node, EState *estate)
 	foreach(l, node->bitmapplans)
 	{
 		initNode = (Plan *) lfirst(l);
-		bitmapplanstates[i] = ExecInitNode(initNode, estate);
+		bitmapplanstates[i] = ExecInitNode(initNode, estate, eflags);
 		i++;
 	}