[GitHub] [spark] beliefer edited a comment on issue #26656: [SPARK-27986][SQL] Support ANSI SQL filter clause for aggregate expression

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beliefer edited a comment on issue #26656: [SPARK-27986][SQL] Support ANSI SQL filter clause for aggregate expression
URL: https://github.com/apache/spark/pull/26656#issuecomment-566553957
 
 
   @cloud-fan
   If SQL contains single distinct and a normal agg function with FILTER, it is handled by `planAggregateWithOneDistinct`. such as:`sum(distinct a), max(b) FILTER (where x > 0)`.
   If SQL contains more than two distinct that use same column and a normal agg function with FILTER, it is handled by `planAggregateWithOneDistinct` too. such as:`sum(distinct a), avg(distinct a), max(b) FILTER (where x > 0)`.
   If SQL contains more than two distinct that use different column and a normal agg function with FILTER, it is handled by `RewriteDistinctAggregates`. such as:`sum(distinct a), avg(distinct b), max(b) FILTER (where x > 0)`.
   
   

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