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https://issues.apache.org/jira/browse/SPARK-14858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15254744#comment-15254744
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Davies Liu commented on SPARK-14858:
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I created a few JIRA related to subquery, it will be great if you could work on
them. You can adjust the priority as you want.
> Push predicates with subquery
> ------------------------------
>
> Key: SPARK-14858
> URL: https://issues.apache.org/jira/browse/SPARK-14858
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Davies Liu
>
> Currently we rewrite the subquery as Join in the beginning of Optimizer, we
> should defer that to enable predicates push down (because Join can't be
> easily pushed down).
> cc [~hvanhovell]
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