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https://issues.apache.org/jira/browse/ARROW-56?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-56.
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Resolution: Fixed
Assignee: Wes McKinney
Resolved in
https://github.com/apache/arrow/commit/c06b7654bccfe8c461869a6e5922668896c27c45
> Format: Specify LSB bit ordering in bit arrays
> ----------------------------------------------
>
> Key: ARROW-56
> URL: https://issues.apache.org/jira/browse/ARROW-56
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Format
> Reporter: Wes McKinney
> Assignee: Wes McKinney
>
> In https://github.com/apache/arrow/blob/master/format/Layout.md, we describe
> bitmaps for nulls (presumably same encoding for boolean data) and provide the
> C code for accessing a bit:
> {{bitmask[j / 8] & (1 << (j % 8))}}
> Implicitly this is LSB bit-endianness
> (https://en.wikipedia.org/wiki/Bit_numbering) -- see the discussion of
> bitpacking in the Parquet format:
> https://github.com/apache/parquet-format/blob/master/Encodings.md#run-length-encoding--bit-packing-hybrid-rle--3
> If this is what we want, we should make this aspect of the format explicit.
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