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https://issues.apache.org/jira/browse/SPARK-14785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15265731#comment-15265731
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Apache Spark commented on SPARK-14785:
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User 'hvanhovell' has created a pull request for this issue:
https://github.com/apache/spark/pull/12822
> Support correlated scalar subquery
> ----------------------------------
>
> Key: SPARK-14785
> URL: https://issues.apache.org/jira/browse/SPARK-14785
> Project: Spark
> Issue Type: New Feature
> Reporter: Davies Liu
>
> For example:
> {code}
> SELECT a from t where b > (select avg(c) from t2 where t.id = t2.id)
> {code}
> it could be rewritten as
> {code}
> SELECT a FROM t JOIN (SELECT id, AVG(c) as avg_c FROM t2 GROUP by id) t3 ON
> t3.id = t.id where b > avg_c
> {code}
> TPCDS Q92, Q81, Q6 required this
> Update: TPCDS Q1 and Q30 also require correlated scalar subquery support.
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