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  1. Hive
  2. HIVE-17936

Dynamic Semijoin Reduction : markSemiJoinForDPP marks unwanted semijoin branches

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Details

    • Bug
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 3.0.0
    • None

    Description

      In method markSemiJoinForDPP (HIVE-17399), the nDVs comparison should not have equality as there is a chance that the values are same on both sides and the branch is still marked as good when it shouldn't be.
      Add a configurable factor to see how useful this is if nDVs on smaller side are only slightly less than that on TS side.

      Attachments

        1. HIVE-17936.3.patch
          20 kB
          Deepak Jaiswal
        2. HIVE-17936.2.patch
          20 kB
          Deepak Jaiswal
        3. HIVE-17936.1.patch
          20 kB
          Deepak Jaiswal

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              djaiswal Deepak Jaiswal
              djaiswal Deepak Jaiswal
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              Dates

                Created:
                Updated:
                Resolved: