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https://issues.apache.org/jira/browse/SPARK-17701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082218#comment-16082218
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Apache Spark commented on SPARK-17701:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/18600
> Refactor DataSourceScanExec so its sameResult call does not compare strings
> ---------------------------------------------------------------------------
>
> Key: SPARK-17701
> URL: https://issues.apache.org/jira/browse/SPARK-17701
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Eric Liang
>
> Currently, RowDataSourceScanExec and FileSourceScanExec rely on a "metadata"
> string map to implement equality comparison, since the RDDs they depend on
> cannot be directly compared. This has resulted in a number of correctness
> bugs around exchange reuse, e.g. SPARK-17673 and SPARK-16818.
> To make these comparisons less brittle, we should refactor these classes to
> compare constructor parameters directly instead of relying on the metadata
> map.
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