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COALESCE() and NULLIF() are now first-class expressions, not macros
that turn into CASE expressions. They evaluate their arguments at most once. Patch by Kris Jurka, review and (very light) editorializing by me.
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: nodes.h,v 1.136 2003/02/03 21:15:44 tgl Exp $
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* $Id: nodes.h,v 1.137 2003/02/16 02:30:39 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -112,6 +112,8 @@ typedef enum NodeTag
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T_RelabelType,
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T_CaseExpr,
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T_CaseWhen,
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T_CoalesceExpr,
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T_NullIfExpr,
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T_NullTest,
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T_BooleanTest,
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T_CoerceToDomain,
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@ -136,6 +138,7 @@ typedef enum NodeTag
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T_SubPlanState,
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T_CaseExprState,
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T_CaseWhenState,
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T_CoalesceExprState,
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T_CoerceToDomainState,
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T_DomainConstraintState,
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