Uploaded image for project: 'Hive'
  1. Hive
  2. HIVE-10924 add support for MERGE statement
  3. HIVE-15839

Don't force cardinality check if only WHEN NOT MATCHED is specified

    XMLWordPrintableJSON

    Details

    • Target Version/s:

      Description

      should've been part of HIVE-14949

      if only WHEN NOT MATCHED is specified then the join is basically an anti-join and we are not retrieving any values from target side. So the cardinality check is just overhead (though presumably very minor since the filter above the join will filter everything and thus there is nothing to group)

        Attachments

        1. HIVE-15839.03.patch
          8 kB
          Eugene Koifman
        2. HIVE-15839.02.patch
          8 kB
          Eugene Koifman
        3. HIVE-15839.01.patch
          8 kB
          Eugene Koifman

          Issue Links

            Activity

              People

              • Assignee:
                ekoifman Eugene Koifman
                Reporter:
                ekoifman Eugene Koifman
              • Votes:
                0 Vote for this issue
                Watchers:
                3 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: