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  1. Hive
  2. HIVE-9644

Fold case & when udfs

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.14.0, 1.0.0, 1.1.0
    • Fix Version/s: 1.2.0
    • Component/s: Logical Optimizer
    • Labels:
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      Description

      Constant folding for queries don't kick in for some automatically generated query patterns which look like this.

      hive> explain select count(1) from store_sales where (case ss_sold_date when '1998-01-01' then 1 else null end)=1;
      

      This should get rewritten by pushing the equality into the case branches.

      select count(1) from store_sales where (case ss_sold_date when '1998-01-01' then 1=1 else null=1 end);
      

      Ending up with a simplified filter condition, resolving itself as

      select count(1) from store_sales where ss_sold_date= '1998-01-01' ;
      

        Attachments

        1. HIVE-9644.1.patch
          23 kB
          Ashutosh Chauhan
        2. HIVE-9644.2.patch
          45 kB
          Ashutosh Chauhan
        3. HIVE-9644.3.patch
          44 kB
          Ashutosh Chauhan
        4. HIVE-9644.patch
          21 kB
          Ashutosh Chauhan

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              • Assignee:
                ashutoshc Ashutosh Chauhan
                Reporter:
                gopalv Gopal V
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                Dates

                • Created:
                  Updated:
                  Resolved: