maropu commented on issue #27058: [SPARK-30395][SQL] When one or more DISTINCT aggregate expressions operate on the same field, the DISTINCT aggregate expression allows the use of the FILTER clause URL: https://github.com/apache/spark/pull/27058#issuecomment-572936002 Yea, I know that. What I just want to know is that we need a lot of code changes to support the thrid case (SPARK-30396 )? ISTM we can easily extend this approache (expland w/ filters in the first aggregation phase) for supporting that. If so, I think its ok to merge the two work in this single PR. Any techinical barrir to do so?
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