[jira] [Commented] (DRILL-4163) Support schema changes for MergeJoin operator.

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

    [ https://issues.apache.org/jira/browse/DRILL-4163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15042488#comment-15042488 ] 

ASF GitHub Bot commented on DRILL-4163:
---------------------------------------

GitHub user amithadke opened a pull request:

    https://github.com/apache/drill/pull/292

    DRILL-4163 Schema changes support in MergeJoin Operator.

    

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

    $ git pull https://github.com/amithadke/drill mergejoin-schemachanges

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

    https://github.com/apache/drill/pull/292.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 #292
    
----
commit 7daf7071748231073dc41b8871712af677ad4ab3
Author: Amit Hadke <am...@gmail.com>
Date:   2015-12-05T00:38:36Z

    DRILL-4163 Schema changes support in MergeJoin Operator.

----


> Support schema changes for MergeJoin operator.
> ----------------------------------------------
>
>                 Key: DRILL-4163
>                 URL: https://issues.apache.org/jira/browse/DRILL-4163
>             Project: Apache Drill
>          Issue Type: Improvement
>            Reporter: amit hadke
>            Assignee: amit hadke
>
> Since external sort operator supports schema changes, allow use of union types in merge join to support for schema changes.
> For now, we assume that merge join always works on record batches from sort operator. Thus merging schemas and promoting to union vectors is already taken care by sort operator.
> Test Cases:
> 1) Only one side changes schema (join on union type and primitive type)
> 2) Both sids change schema on all columns.
> 3) Join between numeric types and string types.
> 4) Missing columns - each batch has different columns. 



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