[SPARK-22750][SQL] Reuse mutable states when possible#19940

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mgaido91 wants to merge 9 commits intoapache:masterfrom mgaido91:SPARK-22750

+80-14

Commits on Dec 10, 2017

[SPARK-22750][SQL] Reuse mutable states when possible
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Commits on Dec 11, 2017

Add assertions
mgaido91
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Commits on Dec 13, 2017

Commits on Dec 15, 2017

remove references to the old name addSingleMutableState
mgaido91
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Commits on Dec 20, 2017

Commits on Dec 21, 2017

renaming
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