yql/essentials/tests/sql/suites/produce/reduce_lambda.sql


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/* postgres can not */
USE plato;

$udf = YQL::@@(lambda '(key stream) (AsStruct
  '('key key) '('summ (Collect (Condense stream (Uint32 '0) (lambda '(item state) (Bool 'False)) (lambda '(item state) (Add state item)))))
))@@;

--INSERT INTO Output
$res = (REDUCE Input1 ON key USING $udf(cast(value as uint32) ?? 0));

select * from $res order by key;