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Posted to issues@drill.apache.org by "Jacques Nadeau (JIRA)" <ji...@apache.org> on 2014/05/29 00:16:04 UTC

[jira] [Commented] (DRILL-847) Merging Receiver requires to canonicalize schemas of input batches

    [ https://issues.apache.org/jira/browse/DRILL-847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14011697#comment-14011697 ] 

Jacques Nadeau commented on DRILL-847:
--------------------------------------

Fixed in 602f817

> Merging Receiver requires to canonicalize schemas of input batches 
> -------------------------------------------------------------------
>
>                 Key: DRILL-847
>                 URL: https://issues.apache.org/jira/browse/DRILL-847
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: Jinfeng Ni
>            Assignee: Jinfeng Ni
>         Attachments: DRILL-847.1.patch
>
>
> The Merge Receivers assumes all the incoming batches have the same schemas. If the incoming batches happen to have different schemas, the run-time generated code for merge receiver would not be able to handle the different schemas, and could throw ClassCast Exception.
> To fix it, we need canonicalize the schemas of incoming batches for merge receiver. If the schemas are still different after this step,  Merge Receiver would throw exception. 



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