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https://issues.apache.org/jira/browse/PARQUET-686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15854825#comment-15854825
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Ryan Blue commented on PARQUET-686:
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The standard I found is ICU 54:
http://userguide.icu-project.org/collation/api#TOC-Instantiating-the-Predefined-Collators
I agree that we should support what SQL engines do, but I don't agree that
they've necessarily chosen an appropriate or "correct" one. What they do is
widely used enough to be a de-facto standard, but I don't think that should
preclude supporting other standards.
> Allow for Unsigned Statistics in Binary Type
> --------------------------------------------
>
> Key: PARQUET-686
> URL: https://issues.apache.org/jira/browse/PARQUET-686
> Project: Parquet
> Issue Type: Bug
> Reporter: Andrew Duffy
>
> BinaryStatistics currently only have a min/max, which are compared as signed
> {{byte[]}}. However, for real UTF8-friendly lexicographic comparison, e.g.
> for string columns, we would want to calculate the BinaryStatistics based off
> of a comparator that treats the bytes as unsigned.
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