[SPARK-19665][SQL] Improve constraint propagation#16998

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viirya wants to merge 5 commits intoapache:masterfrom

viirya:improve-constraints-generation-2

Commits on Feb 3, 2017

Improve the code to generate constraints.
viirya
committed

Commits on Feb 9, 2017

Use parallel collection to improve the function.
viirya
committed

Commits on Feb 17, 2017

Merge remote-tracking branch 'upstream/master' into improve-constraints-generation
viirya
committed
Revert parallel collection approach. Reduce aliased constraints.
viirya
committed

Commits on Feb 23, 2017

Improve constraint propagation.
viirya
committed