Ji Liu created ARROW-6145:
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             Summary: [Java] UnionVector created by MinorType#getNewVector 
could not keep field type info properly
                 Key: ARROW-6145
                 URL: https://issues.apache.org/jira/browse/ARROW-6145
             Project: Apache Arrow
          Issue Type: Bug
          Components: Java
            Reporter: Ji Liu
            Assignee: Ji Liu


When I worked for other items, I found {{UnionVector}} created by 
{{VectorSchemaRoot#create(Schema schema, BufferAllocator allocator)}} could not 
keep field type info properly. For example, if we set metadata in {{Field}} in 
schema, we could not get it back by {{UnionVector#getField}}.

This is mainly because {{MinorType.Union.getNewVector}} did not pass 
{{FieldType}} to vector and {{UnionVector#getField}} create a new {{Field}} 
which cause inconsistent.



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