flink-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3942) Add support for INTERSECT
Date Wed, 29 Jun 2016 22:04:55 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15355876#comment-15355876
] 

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_r69037003
  
    --- Diff: docs/apis/table.md ---
    @@ -535,6 +535,30 @@ Table result = left.unionAll(right);
           </td>
         </tr>
     
    +	<tr>
    +      <td><strong>Intersect</strong></td>
    +      <td>
    +        <p>Similar to a SQL INTERSECT clause. Intersects two tables with duplicate
records removed. Both tables must have identical field types.</p>
    +{% highlight scala %}
    +val left = ds1.toTable(tableEnv, "a, b, c");
    +val right = ds2.toTable(tableEnv, "d, e, f");
    +val result = left.intersect(right);
    +{% endhighlight %}
    +      </td>
    +    </tr>
    +
    +	<tr>
    +      <td><strong>IntersectAll</strong></td>
    +      <td>
    +        <p>Similar to a SQL INTERSECT ALL clause. Intersects two tables. It returns
as many identical records as are in both tables. Both tables must have identical field types.</p>
    +{% highlight scala %}
    +val left = ds1.toTable(tableEnv, "a, b, c");
    --- End diff --
    
    This should be Java code + `highlight java`


> 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.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message