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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-21134) Codegen-only expressions should not be collapsed with upper CodegenFallback expression
Date Mon, 19 Jun 2017 02:09:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-21134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-21134:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>
> 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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