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/* syntax version 1 */
/* postgres can not */
$t = AsList(
AsStruct(7 as a),
AsStruct(4 as a),
AsStruct(5 as a),
AsStruct(1 as a),
AsStruct(2 as a),
AsStruct(9 as a),
AsStruct(1 as a),
AsStruct(9 as a));
$f = AGGREGATION_FACTORY("top", 3);
select Yql::Aggregate($t, AsTuple(), AsTuple(AsTuple(AsAtom("res"),
$f(ListItemType(TypeOf($t)), ($z)->{ return $z.a }))));
use plato;
insert into @a select * from as_table($t);
commit;
select AGGREGATE_BY(a, $f) from @a;
select AGGREGATE_BY(distinct a, $f) from @a;
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