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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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17
src/include/nodes/execnodes.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: execnodes.h,v 1.94 2003/02/09 00:30:39 tgl Exp $
* $Id: execnodes.h,v 1.95 2003/02/16 02:30:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -441,8 +441,9 @@ typedef struct ArrayRefExprState
/* ----------------
* FuncExprState node
*
* Although named for FuncExpr, this is also used for OpExpr and DistinctExpr
* nodes; be careful to check what xprstate.expr is actually pointing at!
* Although named for FuncExpr, this is also used for OpExpr, DistinctExpr,
* and NullIf nodes; be careful to check what xprstate.expr is actually
* pointing at!
* ----------------
*/
typedef struct FuncExprState
@ -539,6 +540,16 @@ typedef struct CaseWhenState
ExprState *result; /* substitution result */
} CaseWhenState;
/* ----------------
* CoalesceExprState node
* ----------------
*/
typedef struct CoalesceExprState
{
ExprState xprstate;
List *args; /* the arguments */
} CoalesceExprState;
/* ----------------
* CoerceToDomainState node
* ----------------