Uploaded image for project: 'IMPALA'
  1. IMPALA
  2. IMPALA-7497

Consider reintroducing numNulls count in compute stats

    XMLWordPrintableJSON

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: Impala 3.0, Impala 2.12.0, Impala 3.1.0
    • Fix Version/s: Impala 3.2.0
    • Component/s: Frontend
    • Labels:
      None
    • Epic Color:
      ghx-label-3

      Description

      IMPALA-1003 disabled numNulls calculations for performance reasons. A lot has changed since, it'd be good to reevaluate computing numNulls. The planner still has some code that uses it for cardinality estimations, so just adding it back to compute stats can lead to easy wins.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                bharathv bharath v
                Reporter:
                jeszyb Balazs Jeszenszky
              • Votes:
                0 Vote for this issue
                Watchers:
                2 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: