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https://issues.apache.org/jira/browse/PARQUET-686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16041802#comment-16041802
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Julien Le Dem commented on PARQUET-686:
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The first issue of not returning bad stats was solved in:
https://github.com/apache/parquet-mr/commit/de99127d77dabfc6c8134b3c58e0b9a0b74e5f37
> 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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