Shuo Xiang created SPARK-7452:
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Summary: need to sort when convert to array in topByKey
Key: SPARK-7452
URL: https://issues.apache.org/jira/browse/SPARK-7452
Project: Spark
Issue Type: Bug
Reporter: Shuo Xiang
the toArray function of the PriorityQueue does not necessarily preserve order.
Add a counter-example as the test, which would fail the original impl.
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