[jira] [Created] (FLINK-40250) Non-comparable types in ORDER BY / GROUP BY throw UnsupportedOperationException instead of a clean ValidationException

[Gustavo de Morais (Jira)]

Gustavo de Morais created FLINK-40250:
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             Summary: Non-comparable types in ORDER BY / GROUP BY throw 
UnsupportedOperationException instead of a clean ValidationException
                 Key: FLINK-40250
                 URL: https://issues.apache.org/jira/browse/FLINK-40250
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
    Affects Versions: 2.3.0
            Reporter: Gustavo de Morais
            Assignee: Gustavo de Morais


Using a non-comparable type (MAP, MULTISET, VARIANT, TIMESTAMP_WITH_TIME_ZONE) 
as an ordering/grouping key throws a raw UnsupportedOperationException from 
comparator codegen instead of a user-facing clean and easy to digest 
ValidationException.

Reproduce:
  SELECT COUNT(*) FROM t GROUP BY map_column;

Now: GenerateUtils.generateCompare throws
  "UnsupportedOperationException: Type(MAP<...>) is not an orderable data type, 
..."

Expected: a ValidationException, e.g.
  "Type 'MAP<...>' cannot be used for comparisons, so it is not supported in
  ORDER BY, GROUP BY, DISTINCT, or as a join or window ordering key."

 



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