[jira] [Commented] (DRILL-5851) Empty table during a join operation with a non empty table produces cast exception

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16273782#comment-16273782 ] 

ASF GitHub Bot commented on DRILL-5851:
---------------------------------------

GitHub user HanumathRao opened a pull request:

    https://github.com/apache/drill/pull/1059

    DRILL-5851: Empty table during a join operation with a non empty tabl…

    …e produces cast exception.
    
    These code changes handle the cases where either of the table in a join is empty and we do not need to process the join further. @paul-rogers @amansinha100 Please review these changes.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/HanumathRao/drill DRILL-5851-lat

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/drill/pull/1059.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 #1059
    
----
commit dbdffa51b802ae6c799264836ad86cc39d34fee2
Author: Hanumath Maduri <hm...@laptop-npjh4dhd.corp.maprtech.com>
Date:   2017-10-09T20:08:13Z

    DRILL-5851: Empty table during a join operation with a non empty table produces cast exception.

----


> Empty table during a join operation with a non empty table produces cast exception 
> -----------------------------------------------------------------------------------
>
>                 Key: DRILL-5851
>                 URL: https://issues.apache.org/jira/browse/DRILL-5851
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Relational Operators
>    Affects Versions: 1.11.0
>            Reporter: Hanumath Rao Maduri
>            Assignee: Hanumath Rao Maduri
>
> Hash Join operation on tables with one table empty and the other non empty throws an exception 
> {code} 
> Error: SYSTEM ERROR: DrillRuntimeException: Join only supports implicit casts between 1. Numeric data
>  2. Varchar, Varbinary data 3. Date, Timestamp data Left type: VARCHAR, Right type: INT. Add explicit casts to avoid this error
> {code}
> Here is an example query with which it is reproducible.
> {code}
> select * from cp.`sample-data/nation.parquet` nation left outer join dfs.tmp.`2.csv` as two on two.a = nation.`N_COMMENT`;
> {code}
> the contents of 2.csv is empty (i.e not even header info).



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