[jira] [Commented] (FLINK-3943) Add support for EXCEPT (set minus)

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

    [ https://issues.apache.org/jira/browse/FLINK-3943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15366729#comment-15366729 ] 

ASF GitHub Bot commented on FLINK-3943:
---------------------------------------

Github user mushketyk commented on the issue:

    https://github.com/apache/flink/pull/2169
  
    @fhueske Hey. Sorry for bothering you. Do I need to change something else in this PR?


> Add support for EXCEPT (set minus)
> ----------------------------------
>
>                 Key: FLINK-3943
>                 URL: https://issues.apache.org/jira/browse/FLINK-3943
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>    Affects Versions: 1.1.0
>            Reporter: Fabian Hueske
>            Assignee: Ivan Mushketyk
>            Priority: Minor
>
> Currently, the Table API and SQL do not support EXCEPT.
> EXCEPT can be executed as a coGroup on all fields that forwards records of the first input if the second input is empty.
> In order to add support for EXCEPT to the Table API and SQL we need to:
> - Implement a {{DataSetMinus}} class that translates an EXCEPT into a DataSet API program using a coGroup on all fields.
> - Implement a {{DataSetMinusRule}} that translates a Calcite {{LogicalMinus}} into a {{DataSetMinus}}.
> - Extend the Table API (and validation phase) to provide an except() method.



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