[jira] [Created] (ARROW-14718) [Java] loadValidityBuffer should avoid allocating memory when input is not null and there are only null or non-null values

[Chao Sun (Jira)]

Chao Sun created ARROW-14718:
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             Summary: [Java] loadValidityBuffer should avoid allocating memory 
when input is not null and there are only null or non-null values
                 Key: ARROW-14718
                 URL: https://issues.apache.org/jira/browse/ARROW-14718
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Java
            Reporter: Chao Sun


Currently in {{BitVectorHelper.loadValidityBuffer}}, we always allocate memory 
when the source vector contains only null or non-null values. However, as the 
format also allows allocating validity buffer even if all values are null or 
not-null, the method should also consider whether the input validity buffer is 
null or not, and avoiding allocating new buffer when it is latter.



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