HangyuanLiu commented on issue #2911: Support not_empty function and empty function URL: https://github.com/apache/incubator-doris/pull/2911#issuecomment-586792476 > Is it necessary to implement this function? Why not using `length(str) == 0`? @morningman I think is necessary ,length(null) == null and empty(null) == 1. And empty(array) is necessary when we implement complex type
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