maropu commented on issue #26656: [SPARK-27986][SQL] Support ANSI SQL filter 
clause for aggregate expression
URL: https://github.com/apache/spark/pull/26656#issuecomment-559316282
 
 
   > I'm sorry! I don't understand this review. Please tell me more.
   
   Plz add some tests like this? (You can see [this 
file](https://github.com/apache/spark/blob/master/sql/core/src/test/resources/sql-tests/inputs/predicate-functions.sql)
 as a reference)
   ```
   select a, sum(b) filter (where b > some_function(...)) from t group by a;
   ```

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