Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/4630#issuecomment-74986152
This LGTM. This PR also fixes [SPARK-2472] [1]. For most queries, the `sql`
is lazy, so the job wasn't submitted until `collect()` or `toLocalIterator()`
are called. The problem occurs when DDLs, commands, and CATS statements are
executed, since they, or part of them (for CATS) are evaluated eagerly. Thanks
for fixing this!
[1]: https://issues.apache.org/jira/browse/SPARK-2472
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