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https://issues.apache.org/jira/browse/SPARK-18874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-18874:
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    Assignee:     (was: Apache Spark)

> First phase: Deferring the correlated predicate pull up to Optimizer phase
> --------------------------------------------------------------------------
>
>                 Key: SPARK-18874
>                 URL: https://issues.apache.org/jira/browse/SPARK-18874
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Nattavut Sutyanyong
>         Attachments: SPARK-18874-3.pdf
>
>
> This JIRA implements the first phase of SPARK-18455 by deferring the 
> correlated predicate pull up from Analyzer to Optimizer. The goal is to 
> preserve the current functionality of subquery in Spark 2.0 (if it works, it 
> continues to work after this JIRA, if it does not, it won't). The performance 
> of subquery processing is expected to be at par with Spark 2.0.
> The representation of the LogicalPlan after Analyzer will be different after 
> this JIRA that it will preserve the original positions of correlated 
> predicates in a subquery. This new representation is a preparation work for 
> the second phase of extending the support of correlated subquery to cases 
> Spark 2.0 does not support such as deep correlation, outer references in 
> SELECT clause.



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