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  1. IMPALA
  2. IMPALA-4728

materialize expressions for window sorts vs lazy expression evaluation

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    • New Feature
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • Impala 2.8.0
    • Impala 2.9.0
    • Frontend

    Description

      Currently Impala uses lazy evaluation for expressions. This can result in a performance overhead when using or reusing expressions in things like a window function order by vs having the expression materialized as a projection from the underlying relation, especially if the expression is used in multiple places.

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              twmarshall Thomas Tauber-Marshall
              grahn Greg Rahn
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