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  1. IMPALA
  2. IMPALA-4743

Evaluate constant arguments to ScalarFnCall once during initialization

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Details

    • Improvement
    • Status: Open
    • Minor
    • Resolution: Unresolved
    • Impala 2.8.0
    • None
    • Backend
    • None

    Description

      Constant input arguments to a ScalarFnCall expression is evaluated in ScalarFnCall::Open(). Ideally, this should be evaluated once during the ScalarFnCall::Prepare(). This allows constant arguments to be constant folded into the body of the UDF's function and prevents repeated evaluation of the input arguments for each fragment instance.

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          is related to

          Sub-task - The sub-task of the issue IMPALA-4192 Pull all expressions in a fragment into QueryState

          • Major - Major loss of function.
          • Resolved

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              kwho Michael Ho
              kwho Michael Ho
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              Dates

                Created:
                Updated: