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https://issues.apache.org/jira/browse/SPARK-9489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-9489:
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Assignee: Josh Rosen (was: Apache Spark)
> Remove compatibleWith, meetsRequirements, and needsAnySort checks from
> Exchange
> -------------------------------------------------------------------------------
>
> Key: SPARK-9489
> URL: https://issues.apache.org/jira/browse/SPARK-9489
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> While reviewing [~yhuai]'s patch for SPARK-2205, I noticed that Exchange's
> {{compatible}} check may be incorrectly returning {{false}} in many cases.
> As far as I know, this is not actually a problem because the {{compatible}},
> {{meetsRequirements}}, and {{needsAnySort}} checks are serving only as
> short-circuit performance optimizations that are not necessary for
> correctness.
> In order to reduce code complexity, I think that we should remove these
> checks and unconditionally rewrite the operator's children. This should be
> safe because we rewrite the tree in a single bottom-up pass.
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