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tianchenMicah Kornfield
dc2c054ce50
tianchen authored and Micah Kornfield committed 2ffb7f82525
ARROW-6035: [Java] Avro adapter support convert nullable value

Related to [ARROW-6035](https://issues.apache.org/jira/browse/ARROW-6035).

A  specific Avro unions type(has two types and one is null type) could convert to a nullable ArrowVector.
For instance, ["null", "string"] could represented by a VarcharVector which could has null value.

Closes #4943 from tianchen92/ARROW-6035 and squashes the following commits:

8af1bfe05 <tianchen> rename
be18c56b3 <tianchen> resolve comments
0e7adda82 <tianchen> fix writer
42979b74f <tianchen> fix
2cc395001 <tianchen> fix nullable check
92fb616c5 <tianchen> resolve comments
ffaa138f4 <tianchen> ARROW-6035:  Avro adapter support convert nullable value

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