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/* syntax version 1 */
/* postgres can not */
$t = AsList(AsStruct(1 as a),AsStruct(2 as a));
$f = AGGREGATION_FACTORY("histogram");
select Yql::Aggregate($t, AsTuple(), AsTuple(AsTuple(AsAtom("res"), $f(
ListItemType(TypeOf($t)), ($z)->{return AsTuple($z.a,1.0)}))));
$f = AGGREGATION_FACTORY("histogram", 5);
select Yql::Aggregate($t, AsTuple(), AsTuple(AsTuple(AsAtom("res"), $f(
ListItemType(TypeOf($t)), ($z)->{return AsTuple($z.a,1.0)}))));
use plato;
insert into @a select AsTuple(a, 1.0) as aa from as_table($t);
commit;
select AGGREGATE_BY(aa,$f) from @a;
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