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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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3
src/include/nodes/parsenodes.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: parsenodes.h,v 1.230 2003/02/13 05:20:03 momjian Exp $
* $Id: parsenodes.h,v 1.231 2003/02/16 02:30:39 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -174,6 +174,7 @@ typedef enum A_Expr_Kind
AEXPR_OR,
AEXPR_NOT,
AEXPR_DISTINCT, /* IS DISTINCT FROM - name must be "=" */
AEXPR_NULLIF, /* NULLIF - name must be "=" */
AEXPR_OF /* IS (not) OF - name must be "=" or "!=" */
} A_Expr_Kind;