Julien Le Dem reassigned ARROW-398:

    Assignee: Julien Le Dem

> [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
>            Assignee: Julien Le Dem
>            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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