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From "Zhan Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-20215) ReuseExchange is boken in SparkSQL
Date Fri, 14 Apr 2017 07:30:41 GMT

    [ https://issues.apache.org/jira/browse/SPARK-20215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15968734#comment-15968734
] 

Zhan Zhang commented on SPARK-20215:
------------------------------------

Seems to be fixed in SPARK-20229

> ReuseExchange is boken in SparkSQL
> ----------------------------------
>
>                 Key: SPARK-20215
>                 URL: https://issues.apache.org/jira/browse/SPARK-20215
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.0
>            Reporter: Zhan Zhang
>            Priority: Minor
>
> Currently if we have query like: A join B Union A join C... with the same join key. Table
A will be scanned multiple times in sql. It is because the megastoreRelation are not shared
by two joins, and ExprId is different.  canonicalized in Expression will not be able to unify
them and two Exchange will not compatible and cannot be reused.



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