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tianchenMicah Kornfield
38504e35f82
tianchen authored and Micah Kornfield committed 45a70478733
ARROW-7546: [Java] Use new implementation to concat vectors values in batch

Related to [ARROW-7546](https://issues.apache.org/jira/browse/ARROW-7546).

Per discussion https://github.com/apache/arrow/pull/5945#discussion_r365108806.

In ARROW-7284, we write a simple method to concat vectors. However, ARROW-7073 is about to concat vector values efficiently, after this PR merged, we should use this new implementation in ArrowReader.

Closes #6431 from tianchen92/ARROW-7546 and squashes the following commits:

9bced461c <tianchen> ARROW-7546:  Use new implementation to concat vectors values in batch

Authored-by: tianchen <niki.lj@alibaba-inc.com>
Signed-off-by: Micah Kornfield <emkornfield@gmail.com>