Details
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Bug
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Status: Resolved
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Blocker
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Resolution: Fixed
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None
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None
Description
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
