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Commit20e11f2

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From: Darren King <darrenk@insightdist.com>
I have always been under the impression that NULL is not equal toNULL and that NULL is not equal to anything else either. If thisis the case, then this patch is correct.If NULL _is_ equal to NULL, then I think there are other problemsin the Group By logic.
1 parentd57753e commit20e11f2

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‎src/backend/executor/nodeGroup.c

Lines changed: 6 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -13,7 +13,7 @@
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* columns. (ie. tuples from the same group are consecutive)
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/executor/nodeGroup.c,v 1.11 1997/10/27 12:00:43 vadim Exp $
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* $Header: /cvsroot/pgsql/src/backend/executor/nodeGroup.c,v 1.12 1998/01/2600:21:02 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
@@ -415,8 +415,11 @@ sameGroup(TupleTableSlot *oldslot,
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if (isNull1==isNull2)
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{
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if (isNull1)/* both are null, they are equal */
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continue;
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/* both are null, they are _not_ equal since
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* NULL is not equal to NULL (or anything).
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* -- 25 Jan 1998 -- darrenk */
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if (isNull1)
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return FALSE;
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val1=fmgr(typoutput,attr1,
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gettypelem(tupdesc->attrs[att-1]->atttypid));

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