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Get rid of long-since-vestigial Iter node type, in favor of adding a

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returns-set boolean field in Func and Oper nodes.  This allows cleaner,
more reliable tests for expressions returning sets in the planner and
parser.  For example, a WHERE clause returning a set is now detected
and complained of in the parser, not only at runtime.
This commit is contained in:
Tom Lane
2002-05-12 23:43:04 +00:00
parent f9e4f611a1
commit 3389a110d4
33 changed files with 297 additions and 676 deletions
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15
src/backend/commands/tablecmds.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.12 2002/04/27 21:24:34 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/tablecmds.c,v 1.13 2002/05/12 23:43:02 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -37,6 +37,7 @@
#include "optimizer/planmain.h"
#include "optimizer/prep.h"
#include "parser/parse.h"
#include "parser/parse_coerce.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "parser/parse_type.h"
@ -2461,9 +2462,7 @@ AlterTableAddConstraint(Oid myrelid,
/*
* Make sure it yields a boolean result.
*/
if (exprType(expr) != BOOLOID)
elog(ERROR, "CHECK '%s' does not yield boolean result",
name);
expr = coerce_to_boolean(expr, "CHECK");
/*
* Make sure no outside relations are
@ -2473,6 +2472,14 @@ AlterTableAddConstraint(Oid myrelid,
elog(ERROR, "Only relation '%s' can be referenced in CHECK",
RelationGetRelationName(rel));
/*
* No subplans or aggregates, either...
*/
if (contain_subplans(expr))
elog(ERROR, "cannot use subselect in CHECK constraint expression");
if (contain_agg_clause(expr))
elog(ERROR, "cannot use aggregate function in CHECK constraint expression");
/*
* Might as well try to reduce any
* constant expressions.