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[jira] [Created] (ARROW-3222) [JAVA] Vector should avoid reallocating validity buffer when necessary


Zhenyuan Zhao created ARROW-3222:
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             Summary: [JAVA] Vector should avoid reallocating validity buffer when necessary
                 Key: ARROW-3222
                 URL: https://issues.apache.org/jira/browse/ARROW-3222
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Java
    Affects Versions: 0.11.0
            Reporter: Zhenyuan Zhao


Vector always reallocates validity buffer in the case of all-null or non-null

[https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/BaseFixedWidthVector.java#L511]

[https://github.com/apache/arrow/blob/master/java/vector/src/main/java/org/apache/arrow/vector/BitVectorHelper.java#L180]

Ideally we should only allocate if the source was not provided



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