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## What changes were proposed in this pull request? This PR allows the creation of a `ColumnarBatch` from `ReadOnlyColumnVectors` where previously a columnar batch could only allocate vectors internally. This is useful for using `ArrowColumnVectors` in a batch form to do row-based iteration. Also added `ArrowConverter.fromPayloadIterator` which converts `ArrowPayload` iterator to `InternalRow` iterator and uses a `ColumnarBatch` internally. ## How was this patch tested? Added a new unit test for creating a `ColumnarBatch` with `ReadOnlyColumnVectors` and a test to verify the roundtrip of rows -> ArrowPayload -> rows, using `toPayloadIterator` and `fromPayloadIterator`. Author: Bryan Cutler <cutlerb@gmail.com> Closes #18787 from BryanCutler/arrow-ColumnarBatch-support-SPARK-21583. |
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