[SPARK-18089][SQL] Remove shuffle codes in CollectLimitExec#15596

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viirya wants to merge 8 commits intoapache:masterfrom viirya:refactor-collectlimit

+41-17

Commits on Oct 22, 2016

Remove shuffle codes in CollectLimitExec.
viirya
committed

Commits on Oct 24, 2016

Fix test.
viirya
committed

Commits on Oct 26, 2016

Minimize the necessary changes.
viirya
committed

Commits on Oct 27, 2016

Revert CollectLimitExec back.
viirya
committed