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get_relattval() should treat a NULL constant as a non-constant expression,
since it has no way to indicate to its caller that the constant is actually NULL. This prevents coredump in cases like WHERE textfield < null::text;
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.65 2000/04/12 17:15:24 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.66 2000/04/16 01:55:45 tgl Exp $
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*
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* HISTORY
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* AUTHOR DATE MAJOR EVENT
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@ -790,7 +790,8 @@ default_results:
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other = (*flag == 0) ? left : right;
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if (IsA(other, Const))
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if (IsA(other, Const) &&
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!((Const *) other)->constisnull)
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{
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*constval = ((Const *) other)->constvalue;
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*flag |= SEL_CONSTANT;
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