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https://issues.apache.org/jira/browse/SPARK-14781?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261474#comment-15261474
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Frederick Reiss commented on SPARK-14781:
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Sure, I'd be happy to put something together to cover Q45. Tomorrow is a mess,
but I'll have time on Friday and Monday.
> Support subquery in nested predicates
> -------------------------------------
>
> Key: SPARK-14781
> URL: https://issues.apache.org/jira/browse/SPARK-14781
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Reporter: Davies Liu
>
> Right now, we does not support nested IN/EXISTS subquery, for example
> EXISTS( x1) OR EXISTS( x2)
> In order to do that, we could use an internal-only join type SemiPlus, which
> will output every row from left, plus additional column as the result of join
> condition. Then we could replace the EXISTS() or IN() by the result column.
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