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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