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  1. Hive
  2. HIVE-12899 Bring query optimization time down
  3. HIVE-13942

Correctness of CASE folding in the presence of NULL values

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Details

    • Sub-task
    • Status: Closed
    • Major
    • Resolution: Fixed
    • 2.1.1, 2.2.0
    • 2.1.0
    • CBO
    • None

    Description

      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 (consider 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 where the bug was originally present, and 2) further improvements needed in HiveRexUtil.simplify.

      Attachments

        1. HIVE-13942.patch
          17 kB
          jcamachorodriguez
        2. HIVE-13942.01.patch
          18 kB
          jcamachorodriguez

        Issue Links

          is broken by

          Sub-task - The sub-task of the issue HIVE-13068 Disable Hive ConstantPropagate optimizer when CBO has optimized the plan II

          • Major - Major loss of function.
          • Closed
          is related to

          Bug - A problem which impairs or prevents the functions of the product. HIVE-12742 NULL table comparison within CASE does not work as previous hive versions

          • Major - Major loss of function.
          • Closed
          links to

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          Activity

            People

              jcamacho Jesús Camacho Rodríguez
              jcamacho Jesús Camacho Rodríguez
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              Dates

                Created:
                Updated:
                Resolved: