[jira] [Commented] (SPARK-14785) Support correlated scalar subquery

["Roy Cecil (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-14785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15259941#comment-15259941 ] 

Roy Cecil commented on SPARK-14785:
-----------------------------------

Q32 falls in this category.

TPC query rewrite rules do not allow the proposed rewrites. So our hands are tied. If this feature is supported along with SPARK-14781 we would achieve 100% TPC-DS capability and would be a great press for spark!! 

> 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) FROM t2 GROUP by id) t3 ON t3.id = t.id
> {code}
> TPCDS Q92, Q81, Q6 required this



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