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-572906391
 
 
   Ah, also, can you put a simple explain example (about how to convert a plan 
with distinct aggregates) in the PR description? better to put how-to-fix in 
this pr there.

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