Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/2884#issuecomment-60050626
@yhuai, it's hard to make a unit test for this since
```addColumnMetadataToConf``` and ```hiveExtraConf``` both can not accessed in
test case, they are private. Actually i debug the code and get this issue, it
seems this will leads to NPE in hive-0.13 on my local test but ok in master
branch(hive-0.12)
@liancheng, updated
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