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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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42
src/backend/utils/adt/ruleutils.c
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@ -3,7 +3,7 @@
* back to source text
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.135 2003/02/13 05:10:39 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/ruleutils.c,v 1.136 2003/02/16 02:30:39 tgl Exp $
*
* This software is copyrighted by Jan Wieck - Hamburg.
*
@ -2238,6 +2238,46 @@ get_rule_expr(Node *node, deparse_context *context,
}
break;
case T_CoalesceExpr:
{
CoalesceExpr *coalesceexpr = (CoalesceExpr *) node;
List *arg;
char *sep;
appendStringInfo(buf, "COALESCE(");
sep = "";
foreach(arg, coalesceexpr->args)
{
Node *e = (Node *) lfirst(arg);
appendStringInfo(buf, sep);
get_rule_expr(e, context, true);
sep = ", ";
}
appendStringInfo(buf, ")");
}
break;
case T_NullIfExpr:
{
NullIfExpr *nullifexpr = (NullIfExpr *) node;
List *arg;
char *sep;
appendStringInfo(buf, "NULLIF(");
sep = "";
foreach(arg, nullifexpr->args)
{
Node *e = (Node *) lfirst(arg);
appendStringInfo(buf, sep);
get_rule_expr(e, context, true);
sep = ", ";
}
appendStringInfo(buf, ")");
}
break;
case T_NullTest:
{
NullTest *ntest = (NullTest *) node;