[SPARK-17513] [STREAMING] [SQL] Make StreamExecution garbage-collect its metadata#15067

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frreiss wants to merge 3 commits intoapache:masterfrom

frreiss:fred-16963a

Commits on Sep 8, 2016

Added purge() call to scheduler
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Commits on Sep 10, 2016

Added test case and corrected off-by-one error.
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Merge branch 'master' of https://github.com/apache/spark into fred-16963a
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