From dffbbb3e5520ea87fc5484664d8b2f88c8dbcdf7 Mon Sep 17 00:00:00 2001
From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Sun, 13 Mar 2005 19:59:40 +0000
Subject: [PATCH] Forgot that I had intended to replace division by masking in
 hash calculation.

---
 src/backend/executor/nodeHash.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/backend/executor/nodeHash.c b/src/backend/executor/nodeHash.c
index c85755890a..ded952a43e 100644
--- a/src/backend/executor/nodeHash.c
+++ b/src/backend/executor/nodeHash.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/executor/nodeHash.c,v 1.89 2005/03/06 22:15:04 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/executor/nodeHash.c,v 1.90 2005/03/13 19:59:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -709,7 +709,8 @@ ExecHashGetBucketAndBatch(HashJoinTable hashtable,
 	if (nbatch > 1)
 	{
 		*bucketno = hashvalue % nbuckets;
-		*batchno = (hashvalue / nbuckets) % nbatch;
+		/* since nbatch is a power of 2, can do MOD by masking */
+		*batchno = (hashvalue / nbuckets) & (nbatch - 1);
 	}
 	else
 	{
-- 
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