X-Git-Url: https://granicus.if.org/sourcecode?a=blobdiff_plain;f=src%2Fbackend%2Fexecutor%2FnodeAgg.c;h=0216f8ebde7fe83f122af02ff1682614204a5630;hb=b60be3f2f8d094da79e04c6eda888f401b09dc39;hp=5fa82ee9faddfa8dafa24386bf3c1d5dd9955b14;hpb=54cb1db6cf4d4bf4e44148582bbd2c99684e7dfd;p=postgresql

diff --git a/src/backend/executor/nodeAgg.c b/src/backend/executor/nodeAgg.c
index 5fa82ee9fa..0216f8ebde 100644
--- a/src/backend/executor/nodeAgg.c
+++ b/src/backend/executor/nodeAgg.c
@@ -45,7 +45,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.95 2002/11/13 00:39:47 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/executor/nodeAgg.c,v 1.96 2002/11/19 23:21:57 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -619,6 +619,9 @@ lookup_hash_entry(Agg *node, TupleTableSlot *slot)
 		Datum		attr;
 		bool		isNull;
 
+		/* rotate hashkey left 1 bit at each step */
+		hashkey = (hashkey << 1) | ((hashkey & 0x80000000) ? 1 : 0);
+
 		attr = heap_getattr(tuple, att, tupdesc, &isNull);
 		if (isNull)
 			continue;			/* treat nulls as having hash key 0 */