beliefer commented on a change in pull request #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#discussion_r362370442
 
 

 ##########
 File path: 
sql/core/src/test/resources/sql-tests/results/group-by-filter.sql.out
 ##########
 @@ -95,41 +95,49 @@ struct<count(id):bigint>
 
 
 -- !query 9
-SELECT a, COUNT(b) FILTER (WHERE a >= 2) FROM testData GROUP BY a
+SELECT COUNT(DISTINCT id) FILTER (WHERE date_format(hiredate, "yyyy-MM-dd 
HH:mm:ss") = "2001-01-01 00:00:00") FROM emp
 -- !query 9 schema
-struct<a:int,count(b):bigint>
+struct<count(DISTINCT id):bigint>
 -- !query 9 output
+3
 
 Review comment:
   I fixed this issue.

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