[jira] [Commented] (SPARK-17701) Refactor DataSourceScanExec so its sameResult call does not compare strings

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-17701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16082218#comment-16082218 ] 

Apache Spark commented on SPARK-17701:
--------------------------------------

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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