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From "Micah Kornfield (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ARROW-253) Int types should only have width of 8*2^n (8, 16, 32, 64)
Date Wed, 10 Aug 2016 19:40:20 GMT

    [ https://issues.apache.org/jira/browse/ARROW-253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15415879#comment-15415879
] 

Micah Kornfield commented on ARROW-253:
---------------------------------------

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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