[jira] [Created] (HIVE-13942) Correctness of CASE folding in the presence of NULL values

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

Jesus Camacho Rodriguez created HIVE-13942:
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             Summary: Correctness of CASE folding in the presence of NULL values
                 Key: HIVE-13942
                 URL: https://issues.apache.org/jira/browse/HIVE-13942
             Project: Hive
          Issue Type: Sub-task
          Components: CBO
    Affects Versions: 2.2.0, 2.1.1
            Reporter: Jesus Camacho Rodriguez
            Assignee: Jesus Camacho Rodriguez


Introduced in HIVE-13068.

{{(case when key<'90' then 2 else 4 end) > 3}} should not fold to {{key >= '90'}}, as these two expressions are not equivalent for _null_ values. Instead, it should fold to {{not NVL((key < '90'),false)}}.

This is caused by 1) some methods still calling original _RexUtil.simplify_ method, and 2) further improvements needed in _HiveRexUtil.simplify_.



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