Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/939#issuecomment-44856418
@rxin Shame... underestimated this issue and didn't run full test locally
:( I think the problem is that `executeCollect()` should copy row objects to
keep data immutable. Also, now user shouldn't call `collect()` on `SchemaRDD`s
returned by a SQL/HiveQL command, since `executeCollect()` calls `execute()`
and causes duplicated command execution.
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