[SPARK-24478][SQL] Move projection and filter push down to physical conversion#21503

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rdblue wants to merge 2 commits intoapache:masterfrom rdblue:SPARK-24478-move-push-down-to-physical-conversion

Commits on Jun 6, 2018

DataSourceV2: push projection, filters when converting to physical plan.
rdblue
committed

Commits on Jun 13, 2018

SPARK-24478: Add a note about where stats are used to v2 interface.
rdblue
committed