GitHub user liancheng opened a pull request:

    https://github.com/apache/spark/pull/1920

    [SPARK-3004][SQL] Added null checking when retrieving row set

    JIRA issue: [SPARK-3004](https://issues.apache.org/jira/browse/SPARK-3004)
    
    HiveThriftServer2 throws exception when the result set contains `NULL`. 
Should check `isNullAt` in `SparkSQLOperationManager.getNextRowSet`.
    
    Note that simply using `row.addColumnValue(null)` doesn't work, since Hive 
set the column type of a null `ColumnValue` to String by default.

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

    $ git pull https://github.com/liancheng/spark spark-3004

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

    https://github.com/apache/spark/pull/1920.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 #1920
    
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commit 221772266928b752594aa99aa1d9656c3c7892b5
Author: Cheng Lian <[email protected]>
Date:   2014-08-13T07:47:11Z

    Fixed SPARK-3004: added null checking when retrieving row set

commit 1b1db1ca768a826224567a6f249ba389c345507f
Author: Cheng Lian <[email protected]>
Date:   2014-08-13T09:13:05Z

    Adding NULL column values in the Hive way

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