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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/13 11:44:54 UTC

[GitHub] [arrow-datafusion] jhorstmann commented on issue #2214: Support for Selective Aggregates, Filter clause

jhorstmann commented on issue #2214:
URL: https://github.com/apache/arrow-datafusion/issues/2214#issuecomment-1097953956

   Note that for most aggregation functions this could be done purely on logical plan level by rewriting `AGGREGATE(input) FILTER (WHERE condition)` to `AGGREGATE(IF(condition, input, NULL))`. This works because aggregations usually ignore `NULL` values themselves. One exception I can think of would be `ARRAY_AGG` which I think keeps `NULL` values.


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