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/* syntax version 1 */
/* postgres can not */
$t = AsList(
AsStruct(1 as key, 200 as value),
AsStruct(2 as key, 100 as value)
);
$f = AGGREGATION_FACTORY("maxby");
select Yql::Aggregate($t, AsTuple(), AsTuple(AsTuple(AsAtom("res"),
$f(ListItemType(TypeOf($t)), ($z)->{ return AsTuple($z.value, $z.key) }))));
$f = AGGREGATION_FACTORY("maxby", 10);
select Yql::Aggregate($t, AsTuple(), AsTuple(AsTuple(AsAtom("res"),
$f(ListItemType(TypeOf($t)), ($z)->{ return AsTuple($z.value, $z.key) }))));
use plato;
insert into @a select AsTuple(value, key) as vk from as_table($t);
commit;
select AGGREGATE_BY(vk, $f) from @a;
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