Uploaded image for project: 'Hive'
  1. Hive
  2. HIVE-5369 Annotate hive operator tree with statistics from metastore
  3. HIVE-7679

JOIN operator should update the column stats when number of rows changes

    XMLWordPrintableJSON

Details

    • Sub-task
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 0.14.0
    • 0.14.0
    • Query Processor, Statistics
    • None

    Description

      JOIN operator does not update the column stats when the number of rows changes. All other operators scales up/down the column statistics when the number of rows changes. Same should be done for JOIN operator as well. Because of this dataSize might become negative as numNulls can get bigger than numRows (if scaling down of column stats is not done).

      Attachments

        1. HIVE-7679.3.patch
          7 kB
          Prasanth Jayachandran
        2. HIVE-7679.2.patch
          6 kB
          Prasanth Jayachandran
        3. HIVE-7679.1.patch
          6 kB
          Prasanth Jayachandran

        Issue Links

          is related to

          Sub-task - The sub-task of the issue HIVE-5579 Update statistics rules for different types of joins

          • Major - Major loss of function.
          • Open

          Activity

            People

              prasanth_j Prasanth Jayachandran
              prasanth_j Prasanth Jayachandran
              Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: