Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/374#issuecomment-40027493
A few notes.
* This is tracked by
[SPARK-1436](https://issues.apache.org/jira/browse/SPARK-1436)
* We are trying to include this in 1.0. If we can't we will need to flip
off cachingTables or something as this currently results in the SparkSQL
returning wrong answers.
* Running the Hive tests found tons of bugs, so I think we need to include
them until there is better coverage for columnar stuff in unit tests.
[SPARK-1455](https://issues.apache.org/jira/browse/SPARK-1455) will make the
increase in test time less of an issue.
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