[jira] [Commented] (FLINK-3942) Add support for INTERSECT

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15367496#comment-15367496 ] 

ASF GitHub Bot commented on FLINK-3942:
---------------------------------------

Github user twalthr commented on the issue:

    https://github.com/apache/flink/pull/2159
  
    @wuchong Fabian is on vacation at the moment. I will review your code the next days.


> Add support for INTERSECT
> -------------------------
>
>                 Key: FLINK-3942
>                 URL: https://issues.apache.org/jira/browse/FLINK-3942
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>    Affects Versions: 1.1.0
>            Reporter: Fabian Hueske
>            Assignee: Jark Wu
>            Priority: Minor
>
> Currently, the Table API and SQL do not support INTERSECT.
> INTERSECT can be executed as join on all fields.
> In order to add support for INTERSECT to the Table API and SQL we need to:
> - Implement a {{DataSetIntersect}} class that translates an INTERSECT into a DataSet API program using a join on all fields.
> - Implement a {{DataSetIntersectRule}} that translates a Calcite {{LogicalIntersect}} into a {{DataSetIntersect}}.
> - Extend the Table API (and validation phase) to provide an intersect() method.



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