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https://issues.apache.org/jira/browse/FLINK-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348210#comment-15348210
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ASF GitHub Bot commented on FLINK-3942:
---------------------------------------
GitHub user wuchong opened a pull request:
https://github.com/apache/flink/pull/2159
[FLINK-3942] [tableAPI] Add support for INTERSECT
Internally, I translate INTERSECT into a Join on all fields and then a
distinct for removing duplicate records.
As Calcite SQL Parser doesn't support `INTERSECT ALL` , so I didn't add
`intersectAll()` function to `Table`.
I can add the corresponding documents if needed.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wuchong/flink INTERSECT
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/2159.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 #2159
----
commit a666a3aabb01090eb3c6205b28e54a0dbb2e8a05
Author: Jark Wu <wuchong...@alibaba-inc.com>
Date: 2016-06-24T11:57:09Z
[FLINK-3942] [tableAPI] Add support for INTERSECT
----
> 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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