Ji Liu created ARROW-6035:
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             Summary: [Java] Avro adapter support convert nullable value
                 Key: ARROW-6035
                 URL: https://issues.apache.org/jira/browse/ARROW-6035
             Project: Apache Arrow
          Issue Type: Sub-task
            Reporter: Ji Liu
            Assignee: Ji Liu


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.



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