ClickHouse : arrayMap, arrayJoin or ARRAY JOIN memory usage
Why arrayMap, arrayFilter, arrayJoin use...arrayMap-like functions memory usage calculation....In order to calculate arrayMap or similar array* functions ClickHouse temporarily does arrayJoin-like...SELECT arrayMap(x -> ((array_1[x]) * (array_2[x])), arrayEnumerate(array_1)) AS multi
FROM
(
SELECT...SELECT arrayMap((x, y) -> (x * y), array_1, array_2) AS multi
FROM
(
SELECT
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