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Posted to issues@trafodion.apache.org by "liu ming (JIRA)" <ji...@apache.org> on 2016/06/10 05:43:21 UTC

[jira] [Commented] (TRAFODION-2047) add SQL syntax support to INTERSECT

    [ https://issues.apache.org/jira/browse/TRAFODION-2047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323913#comment-15323913 ] 

liu ming commented on TRAFODION-2047:
-------------------------------------

Most of INTERSECT code is already in Trafodion, but not enabled.
The current logic is to transform the INTERSECT into JOIN and remove the output from left table, which I believe is same as SEMI JOIN.

So I propose to change the JOIN into SEMI_JOIN and enable the support of INTERSECT.

I think all changes are in Binder.

> add SQL syntax support to INTERSECT
> -----------------------------------
>
>                 Key: TRAFODION-2047
>                 URL: https://issues.apache.org/jira/browse/TRAFODION-2047
>             Project: Apache Trafodion
>          Issue Type: New Feature
>            Reporter: liu ming
>            Assignee: liu ming
>
> INTERSECT is a common SQL syntax. 
> Trafodion should support it.



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