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Posted to issues@spark.apache.org by "Liang-Chi Hsieh (JIRA)" <ji...@apache.org> on 2017/06/19 02:00:03 UTC

[jira] [Created] (SPARK-21134) Codegen-only expressions should not be collapsed with upper CodegenFallback expression

Liang-Chi Hsieh created SPARK-21134:
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             Summary: Codegen-only expressions should not be collapsed with upper CodegenFallback expression
                 Key: SPARK-21134
                 URL: https://issues.apache.org/jira/browse/SPARK-21134
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.1.1
            Reporter: Liang-Chi Hsieh


The rule {{CollapseProject}} in optimizer collapses lower and upper expressions if they have common expressions.

We have seen a use case that a codegen-only expression has been collapsed with an upper {{CodegenFallback}} expression. Because all children expressions under {{CodegenFallback}} will be evaluated with non-codegen path {{eval}}, it causes an exception in runtime.




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