Wes McKinney created ARROW-398:
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Summary: [Java] Java file format requires bitmaps of all 1's to be
written when there are no nulls
Key: ARROW-398
URL: https://issues.apache.org/jira/browse/ARROW-398
Project: Apache Arrow
Issue Type: Bug
Components: Java - Vectors
Reporter: Wes McKinney
Priority: Blocker
>From the format specification "Arrays having a 0 null count may choose to not
>allocate the null bitmap. Implementations may choose to always allocate one
>anyway as a matter of convenience, but this should be noted when memory is
>being shared."
When the null count is 0 and the validity buffer has length 0, then in Java for
now the simplest thing will be to allocate a new validity buffer with all 1's.
See the corresponding C++ logic where a 0-length buffer is being written when
the null count is 0:
https://github.com/apache/arrow/blob/master/cpp/src/arrow/ipc/adapter.cc#L83
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