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  1. IMPALA
  2. IMPALA-9358

Query slowdown with inline views and hundreds of columns

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: Impala 3.2.0
    • Fix Version/s: Impala 3.4.0
    • Component/s: Frontend
    • Labels:
      None
    • Epic Color:
      ghx-label-1

      Description

      IMPALA-8386 introduced an expensive precondition check using the function ExprSubstitutionMap.checkComposedFrom(). This check has significant performance impact on statements that contain inline views with hundreds of columns. This check needs to be made more efficient to avoid exponential slowdowns with many columns.

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              • Assignee:
                kdeschle Kurt Deschler
                Reporter:
                kdeschle Kurt Deschler
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                • Created:
                  Updated:
                  Resolved: