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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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41
src/backend/nodes/copyfuncs.c
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@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.243 2003/02/10 04:44:44 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.244 2003/02/16 02:30:37 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -785,7 +785,7 @@ _copyOpExpr(OpExpr *from)
}
/*
* _copyDistinctExpr
* _copyDistinctExpr (same as OpExpr)
*/
static DistinctExpr *
_copyDistinctExpr(DistinctExpr *from)
@ -919,6 +919,37 @@ _copyCaseWhen(CaseWhen *from)
return newnode;
}
/*
* _copyCoalesceExpr
*/
static CoalesceExpr *
_copyCoalesceExpr(CoalesceExpr *from)
{
CoalesceExpr *newnode = makeNode(CoalesceExpr);
COPY_SCALAR_FIELD(coalescetype);
COPY_NODE_FIELD(args);
return newnode;
}
/*
* _copyNullIfExpr (same as OpExpr)
*/
static NullIfExpr *
_copyNullIfExpr(NullIfExpr *from)
{
NullIfExpr *newnode = makeNode(NullIfExpr);
COPY_SCALAR_FIELD(opno);
COPY_SCALAR_FIELD(opfuncid);
COPY_SCALAR_FIELD(opresulttype);
COPY_SCALAR_FIELD(opretset);
COPY_NODE_FIELD(args);
return newnode;
}
/*
* _copyNullTest
*/
@ -2484,6 +2515,12 @@ copyObject(void *from)
case T_CaseWhen:
retval = _copyCaseWhen(from);
break;
case T_CoalesceExpr:
retval = _copyCoalesceExpr(from);
break;
case T_NullIfExpr:
retval = _copyNullIfExpr(from);
break;
case T_NullTest:
retval = _copyNullTest(from);
break;