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https://issues.apache.org/jira/browse/SPARK-13523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Hamstra resolved SPARK-13523.
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Resolution: Duplicate
> Reuse the exchanges in a query
> ------------------------------
>
> Key: SPARK-13523
> URL: https://issues.apache.org/jira/browse/SPARK-13523
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Davies Liu
>
> In exchange, the RDD will be materialized (shuffled or collected), it's a
> good point to eliminate common part of a query.
> In some TPCDS queries (for example, Q64), the same exchange (ShuffleExchange
> or BroadcastExchange) could be used multiple times, we should re-use them to
> avoid the duplicated work and reduce the memory for broadcast.
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