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https://issues.apache.org/jira/browse/ARROW-253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15415879#comment-15415879
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Micah Kornfield commented on ARROW-253:
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until we decide if/how we support enumeration/factor types we might want to
leave variable bit-width in place. There is some research showing CPU
efficient operations for particular layouts in bit-packed words
(http://pages.cs.wisc.edu/~jignesh/publ/BitWeaving.pdf)
> Int types should only have width of 8*2^n (8, 16, 32, 64)
> ---------------------------------------------------------
>
> Key: ARROW-253
> URL: https://issues.apache.org/jira/browse/ARROW-253
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Format
> Reporter: Julien Le Dem
>
> Since arrow is focused on CPU efficient operations and we want to keep the
> spec simple to the minimum required we should restrict the Int type to width
> of 1, 2, 4 or 8 bytes
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