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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3943) Add support for EXCEPT (set minus)
Date Wed, 29 Jun 2016 23:40:12 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356182#comment-15356182
] 

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

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/2169#discussion_r69047691
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
---
    @@ -426,6 +426,49 @@ class Table(
       }
     
       /**
    +    * Set minus between two [[Table]]s. Similar to an SQL EXCEPT ALL.
    --- End diff --
    
    Please describe the semantics of minus all in more detail.


> 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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