maropu commented on issue #26420: [SPARK-27986][SQL] Support ANSI SQL filter predicate for aggregate expression. URL: https://github.com/apache/spark/pull/26420#issuecomment-551834128 I just thought a super simple case like this; ``` postgres=# select * from t; k | v1 | v2 ---+----+---- 1 | 2 | 3 1 | 4 | 5 1 | | 9 2 | 3 | 2 | 5 | 8 (5 rows) postgres=# select k, sum(v1) filter (where v1 > 2), avg(v2) filter (where v2 < 6) from t group by k; k | sum | avg ---+-----+-------------------- 2 | 8 | 1 | 4 | 4.0000000000000000 (2 rows) ``` The query above might be transformed into... ``` scala> sql("select k, sum(v1), avg(v2) from (select k, if(v1 > 2, v1, null) v1, if(v2 < 6, v2, null) v2 from t) group by k").show() +---+-------+-------+ | k|sum(v1)|avg(v2)| +---+-------+-------+ | 1| 4| 4.0| | 2| 8| null| +---+-------+-------+ ```
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