Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/4835#issuecomment-76892275
I think this PR also fixes [SPARK-6020] [1], since
`InMemoryColumnarTableScan` uses accumulator to generate debugging information
which is dedicated for `PartitionBatchPruningSuite`. The test failures showed
in SPARK-6020 suggested that accumulator updates may get lost
nondeterminstically.
[1]: https://issues.apache.org/jira/browse/SPARK-6020
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