Liya Fan created ARROW-8009:
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Summary: [Java] Fix the hash code mehods for BitVector
Key: ARROW-8009
URL: https://issues.apache.org/jira/browse/ARROW-8009
Project: Apache Arrow
Issue Type: Bug
Components: Java
Reporter: Liya Fan
Assignee: Liya Fan
The current hash code methods of BitVector are based on implementations in
BaseFixedWidthVector, which rely on the type width of the vector.
For BitVector, the type width is 0, so the underlying data is not actually used
when computing the hash code. That means, the hash code will always be 0, no
matter if the underlying data is null or not, and no matter if the underlying
bit is 0 or 1.
We fix this by overriding the methods in BitVector.
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