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https://issues.apache.org/jira/browse/FLINK-3943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15351676#comment-15351676
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ASF GitHub Bot commented on FLINK-3943:
---------------------------------------
GitHub user mushketyk opened a pull request:
https://github.com/apache/flink/pull/2169
[FLINK-3943] Add support for EXCEPT operator
Thanks for contributing to Apache Flink. Before you open your pull request,
please take the following check list into consideration.
If your changes take all of the items into account, feel free to open your
pull request. For more information and/or questions please refer to the [How To
Contribute guide](http://flink.apache.org/how-to-contribute.html).
In addition to going through the list, please provide a meaningful
description of your changes.
- [x] General
- The pull request references the related JIRA issue ("[FLINK-XXX] Jira
title text")
- The pull request addresses only one issue
- Each commit in the PR has a meaningful commit message (including the
JIRA id)
- [x] Documentation
- Documentation has been added for new functionality
- Old documentation affected by the pull request has been updated
- JavaDoc for public methods has been added
- [x] Tests & Build
- Functionality added by the pull request is covered by tests
- `mvn clean verify` has been executed successfully locally or a Travis
build has passed
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/mushketyk/flink except-2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2169.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2169
----
commit d6ad27965068bfc3dde0324e2b4c75c07b30d193
Author: Ivan Mushketyk <[email protected]>
Date: 2016-06-26T14:20:25Z
Not yet done
commit 4925340f17fb8327d9ba38704d4281ae760121db
Author: Ivan Mushketyk <[email protected]>
Date: 2016-06-27T19:27:33Z
[FLINK-3943] Add EXCEPT operator
commit daea09fc0946d676c5ec153e3c9a90202f2d0687
Author: Ivan Mushketyk <[email protected]>
Date: 2016-06-27T19:43:38Z
[FLINK-3943] Add EXCEPT documentation
----
> 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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