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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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33
src/backend/nodes/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.199 2003/02/10 04:44:45 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.200 2003/02/16 02:30:37 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -753,6 +753,27 @@ _outCaseWhen(StringInfo str, CaseWhen *node)
WRITE_NODE_FIELD(result);
}
static void
_outCoalesceExpr(StringInfo str, CoalesceExpr *node)
{
WRITE_NODE_TYPE("COALESCE");
WRITE_OID_FIELD(coalescetype);
WRITE_NODE_FIELD(args);
}
static void
_outNullIfExpr(StringInfo str, NullIfExpr *node)
{
WRITE_NODE_TYPE("NULLIFEXPR");
WRITE_OID_FIELD(opno);
WRITE_OID_FIELD(opfuncid);
WRITE_OID_FIELD(opresulttype);
WRITE_BOOL_FIELD(opretset);
WRITE_NODE_FIELD(args);
}
static void
_outNullTest(StringInfo str, NullTest *node)
{
@ -1277,6 +1298,10 @@ _outAExpr(StringInfo str, A_Expr *node)
appendStringInfo(str, " DISTINCT ");
WRITE_NODE_FIELD(name);
break;
case AEXPR_NULLIF:
appendStringInfo(str, " NULLIF ");
WRITE_NODE_FIELD(name);
break;
case AEXPR_OF:
appendStringInfo(str, " OF ");
WRITE_NODE_FIELD(name);
@ -1576,6 +1601,12 @@ _outNode(StringInfo str, void *obj)
case T_CaseWhen:
_outCaseWhen(str, obj);
break;
case T_CoalesceExpr:
_outCoalesceExpr(str, obj);
break;
case T_NullIfExpr:
_outNullIfExpr(str, obj);
break;
case T_NullTest:
_outNullTest(str, obj);
break;