[SPARK-21583][SQL] Create a ColumnarBatch from ArrowColumnVectors#18787

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BryanCutler wants to merge 13 commits intoapache:masterfrom

BryanCutler:arrow-ColumnarBatch-support-SPARK-21583

Commits on Aug 1, 2017

fix assert that columns equals schema length
BryanCutler
committed

Commits on Aug 9, 2017

Commits on Aug 25, 2017

Merge remote-tracking branch 'upstream/master' into arrow-ColumnarBatch-support-SPARK-21583
BryanCutler
committed
updated fromPayloadIterator to work with immutable ColumnVector
BryanCutler
committed
using ArrowRowIterator trait instead of tuple for schema
BryanCutler
committed

Commits on Aug 29, 2017

forgot to close allocator in test, some cleanup
BryanCutler
committed

Commits on Aug 30, 2017

simplified round-trip test data to seq of rows
BryanCutler
committed