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  1. IMPALA
  2. IMPALA-7497

Consider reintroducing numNulls count in compute stats

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Details

    • Improvement
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • Impala 3.0, Impala 2.12.0, Impala 3.1.0
    • Impala 3.2.0
    • Frontend
    • None
    • 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.

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          duplicates

          Bug - A problem which impairs or prevents the functions of the product. IMPALA-7659 Collect count of nulls when collecting stats

          • Major - Major loss of function.
          • Resolved

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              bharathv Bharath Vissapragada
              jeszyb Balazs Jeszenszky
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                Created:
                Updated:
                Resolved: