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get_relattval() should treat a NULL constant as a non-constant expression,

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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;
This commit is contained in:
Tom Lane
2000-04-16 01:55:45 +00:00
parent 3e51872a98
commit 8064a49f6f
1 changed files with 3 additions and 2 deletions
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5
src/backend/optimizer/util/clauses.c
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@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.65 2000/04/12 17:15:24 momjian Exp $ * $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.66 2000/04/16 01:55:45 tgl Exp $
* *
* HISTORY * HISTORY
* AUTHOR DATE MAJOR EVENT * AUTHOR DATE MAJOR EVENT
@ -790,7 +790,8 @@ default_results:
other = (*flag == 0) ? left : right; other = (*flag == 0) ? left : right;
if (IsA(other, Const)) if (IsA(other, Const) &&
!((Const *) other)->constisnull)
{ {
*constval = ((Const *) other)->constvalue; *constval = ((Const *) other)->constvalue;
*flag |= SEL_CONSTANT; *flag |= SEL_CONSTANT;