HyukjinKwon commented on a change in pull request #25415: 
[SPARK-28390][SQL][PYTHON][TESTS] [FOLLOW-UP]Convert and port 
'pgSQL/select_having.sql' into UDF test base
URL: https://github.com/apache/spark/pull/25415#discussion_r313187752
 
 

 ##########
 File path: 
sql/core/src/test/resources/sql-tests/inputs/udf/pgSQL/udf-select_having.sql
 ##########
 @@ -6,7 +6,7 @@
 -- 
https://github.com/postgres/postgres/blob/REL_12_BETA2/src/test/regress/sql/select_having.sql
 --
 -- This test file was converted from inputs/pgSQL/select_having.sql
--- TODO: We should add UDFs in GROUP BY clause when [SPARK-28445] is resolved.
+-- TODO: We should add UDFs in GROUP BY clause when [SPARK-28386] and 
[SPARK-26741] is resolved.
 
 Review comment:
   Ah, right. I forgot. Can we enable all other tests with UDF in group-by and 
comment out the test?
   
   ```
   -- !query 11
   SELECT udf(b), udf(c) FROM test_having
   GROUP BY udf(b), udf(c) HAVING udf(count(*)) = 1 ORDER BY udf(b), udf(c)
   -- !query 11 schema
   struct<>
   -- !query 11 output
   org.apache.spark.sql.AnalysisException
   cannot resolve 'b' given input columns: [CAST(udf(cast(b as string)) AS 
INT), CAST(udf(cast(c as string)) AS STRING)]; line 2 pos 63
   ```
   
   I guess we can still add some more tests?

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