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Support expressions of the form 'scalar op ANY (array)' and

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'scalar op ALL (array)', where the operator is applied between the
lefthand scalar and each element of the array.  The operator must
yield boolean; the result of the construct is the OR or AND of the
per-element results, respectively.

Original coding by Joe Conway, after an idea of Peter's.  Rewritten
by Tom to keep the implementation strictly separate from subqueries.
This commit is contained in:
Tom Lane
2003-06-29 00:33:44 +00:00
parent df7618020b
commit bee217924d
28 changed files with 875 additions and 157 deletions
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92
src/backend/parser/parse_oper.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.67 2003/06/27 00:33:25 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.68 2003/06/29 00:33:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -737,6 +737,96 @@ make_op(ParseState *pstate, List *opname, Node *ltree, Node *rtree)
return result;
}
/*
* make_scalar_array_op()
* Build expression tree for "scalar op ANY/ALL (array)" construct.
*/
Expr *
make_scalar_array_op(ParseState *pstate, List *opname,
bool useOr,
Node *ltree, Node *rtree)
{
Oid ltypeId,
rtypeId,
atypeId,
res_atypeId;
Operator tup;
Form_pg_operator opform;
Oid actual_arg_types[2];
Oid declared_arg_types[2];
List *args;
Oid rettype;
ScalarArrayOpExpr *result;
ltypeId = exprType(ltree);
atypeId = exprType(rtree);
/*
* The right-hand input of the operator will be the element type of
* the array. However, if we currently have just an untyped literal
* on the right, stay with that and hope we can resolve the operator.
*/
if (atypeId == UNKNOWNOID)
rtypeId = UNKNOWNOID;
else
{
rtypeId = get_element_type(atypeId);
if (!OidIsValid(rtypeId))
elog(ERROR, "op ANY/ALL (array) requires array on right side");
}
/* Now resolve the operator */
tup = oper(opname, ltypeId, rtypeId, false);
opform = (Form_pg_operator) GETSTRUCT(tup);
args = makeList2(ltree, rtree);
actual_arg_types[0] = ltypeId;
actual_arg_types[1] = rtypeId;
declared_arg_types[0] = opform->oprleft;
declared_arg_types[1] = opform->oprright;
/*
* enforce consistency with ANYARRAY and ANYELEMENT argument and
* return types, possibly adjusting return type or declared_arg_types
* (which will be used as the cast destination by make_fn_arguments)
*/
rettype = enforce_generic_type_consistency(actual_arg_types,
declared_arg_types,
2,
opform->oprresult);
/*
* Check that operator result is boolean
*/
if (rettype != BOOLOID)
elog(ERROR, "op ANY/ALL (array) requires operator to yield boolean");
if (get_func_retset(opform->oprcode))
elog(ERROR, "op ANY/ALL (array) requires operator not to return a set");
/*
* Now switch back to the array type on the right, arranging for
* any needed cast to be applied.
*/
res_atypeId = get_array_type(declared_arg_types[1]);
if (!OidIsValid(res_atypeId))
elog(ERROR, "unable to find datatype for array of %s",
format_type_be(declared_arg_types[1]));
actual_arg_types[1] = atypeId;
declared_arg_types[1] = res_atypeId;
/* perform the necessary typecasting of arguments */
make_fn_arguments(pstate, args, actual_arg_types, declared_arg_types);
/* and build the expression node */
result = makeNode(ScalarArrayOpExpr);
result->opno = oprid(tup);
result->opfuncid = InvalidOid;
result->useOr = useOr;
result->args = args;
ReleaseSysCache(tup);
return (Expr *) result;
}
/*
* make_op_expr()