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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5395) Query on MapR-DB table fails with NPE due to an issue with assignment logic
Date Wed, 29 Mar 2017 04:35:41 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15946514#comment-15946514
] 

ASF GitHub Bot commented on DRILL-5395:
---------------------------------------

GitHub user ppadma opened a pull request:

    https://github.com/apache/drill/pull/803

    DRILL-5395: Query on MapR-DB table fails with NPE due to an issue wit…

    … counts
    See [DRILL-5395](https://issues.apache.org/jira/browse/DRILL-5395) for details.
    
    
    


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

    $ git pull https://github.com/ppadma/drill DRILL-5395

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

    https://github.com/apache/drill/pull/803.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 #803
    
----
commit 1a21d4a9ddfeb5f06a3224016d7925ccfc135e75
Author: Padma Penumarthy <ppenumar97@yahoo.com>
Date:   2017-03-28T22:08:54Z

    DRILL-5395: Query on MapR-DB table fails with NPE due to an issue with assignment logic

----


> Query on MapR-DB table fails with NPE due to an issue with assignment logic
> ---------------------------------------------------------------------------
>
>                 Key: DRILL-5395
>                 URL: https://issues.apache.org/jira/browse/DRILL-5395
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization, Storage - MapRDB
>    Affects Versions: 1.9.0, 1.10.0
>            Reporter: Abhishek Girish
>            Assignee: Padma Penumarthy
>              Labels: MapR-DB-Binary
>             Fix For: 1.11.0
>
>         Attachments: drillbit.log.txt
>
>
> We uncovered this issue when working on DRILL-5394. 
> The MapR-DB table in question had 5 tablets with skewed data distribution (~6 million
rows). A partial WIP fix for DRILL-5394 caused the number of rows to be reported incorrectly
(~300,000). 2 minor fragments were created (due to filter selectivity) for scanning the 5
tablets. And this resulted in an NPE, possibly related to an issue with assignment logic,
that was now exposed. 
> Representative query:
> {code}
> SELECT Convert_from(avail.customer, 'UTF8') AS ABC, 
>        Convert_from(prop.customer, 'UTF8')  AS PQR 
> FROM   (SELECT Convert_from(a.row_key, 'UTF8') 
>                AS customer, 
>                Cast(Convert_from(a.data .` l_discount ` , 'double_be') AS FLOAT) 
>                AS availability 
>         FROM   db.tpch_maprdb.lineitem_1 a 
>         WHERE  Convert_from(a.row_key, 'UTF8') = '%004%') AS avail 
>        join 
>               (SELECT Convert_from(b.row_key, 'UTF8') 
>                       AS customer, 
>                Cast( 
>        Convert_from(b.data .` l_discount ` , 'double_be') AS FLOAT) AS 
>                availability 
>         FROM   db.tpch_maprdb.lineitem_1 b 
>         WHERE  Convert_from(b.row_key, 'UTF8') LIKE '%003%') AS prop 
>          ON avail.customer = prop.customer; 
> {code}
> Error:
> {code}
> org.apache.drill.common.exceptions.UserException: SYSTEM ERROR: NullPointerException
> {code}
> Log attached. 



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