[SPARK-17513][SQL] Make StreamExecution garbage-collect its metadata#15126

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petermaxlee wants to merge 7 commits intoapache:masterfrom

petermaxlee:SPARK-17513

Commits on Sep 8, 2016

Added purge() call to scheduler
frreiss
committed

Commits on Sep 10, 2016

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

Commits on Sep 17, 2016