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COALESCE() and NULLIF() are now first-class expressions, not macros

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that turn into CASE expressions.  They evaluate their arguments at most
once.  Patch by Kris Jurka, review and (very light) editorializing by me.
This commit is contained in:
Tom Lane
2003-02-16 02:30:39 +00:00
parent de25638d2f
commit 51972a9d5d
22 changed files with 644 additions and 107 deletions
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5
src/include/nodes/nodes.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: nodes.h,v 1.136 2003/02/03 21:15:44 tgl Exp $
* $Id: nodes.h,v 1.137 2003/02/16 02:30:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -112,6 +112,8 @@ typedef enum NodeTag
T_RelabelType,
T_CaseExpr,
T_CaseWhen,
T_CoalesceExpr,
T_NullIfExpr,
T_NullTest,
T_BooleanTest,
T_CoerceToDomain,
@ -136,6 +138,7 @@ typedef enum NodeTag
T_SubPlanState,
T_CaseExprState,
T_CaseWhenState,
T_CoalesceExprState,
T_CoerceToDomainState,
T_DomainConstraintState,