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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3942) Add support for INTERSECT
Date Fri, 24 Jun 2016 22:51:16 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348811#comment-15348811
] 

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

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

    https://github.com/apache/flink/pull/2159#discussion_r68473636
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/api/table/table.scala
---
    @@ -446,6 +446,31 @@ class Table(
       }
     
       /**
    +    * Intersect two [[Table]]s with duplicate records removed. Intersect returns rows
only
    +    * from the left table that are identical to a row in the right table.
    +    * Similar to an SQL INTERSECT. The fields of the two union operations must fully
overlap.
    --- End diff --
    
    "The fields of the two union operations must fully overlap." -> "The fields of the
two intersected tables must fully overlap."


> 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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