[jira] [Assigned] (ARROW-398) [Java] Java file format requires bitmaps of all 1's to be written when there are no nulls

["Julien Le Dem (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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