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https://issues.apache.org/jira/browse/ARROW-1710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16218606#comment-16218606
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Wes McKinney commented on ARROW-1710:
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See https://github.com/apache/arrow/blob/master/format/Layout.md#null-bitmaps.
"Arrays having a 0 null count may choose to not allocate the null bitmap.". So
when there are no nulls, it is not necessary to create a BitVector. It is also
not necessary to populate the bit vector, so as you say waiting until the first
null to create the bitmap might be the way to go.
> [Java] Decide what to do with non-nullable vectors in new vector class
> hierarchy
> ---------------------------------------------------------------------------------
>
> Key: ARROW-1710
> URL: https://issues.apache.org/jira/browse/ARROW-1710
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: Java - Vectors
> Reporter: Li Jin
> Fix For: 0.8.0
>
>
> So far the consensus seems to be remove all non-nullable vectors.
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