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Posted to issues@arrow.apache.org by "Antoine Pitrou (JIRA)" <ji...@apache.org> on 2018/10/17 09:51:00 UTC

[jira] [Commented] (ARROW-3536) [C++] Fast UTF8 validation functions

    [ https://issues.apache.org/jira/browse/ARROW-3536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16653282#comment-16653282 ] 

Antoine Pitrou commented on ARROW-3536:
---------------------------------------

The ASCII validation function looks fine (though my experiments show that a non-SIMD version would be as fast).

The UTF8 validation function is unreadable, and not battle-tested, so I wouldn't want to integrate it (also, does it accept surrogates? It's not obvious).

> [C++] Fast UTF8 validation functions
> ------------------------------------
>
>                 Key: ARROW-3536
>                 URL: https://issues.apache.org/jira/browse/ARROW-3536
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 0.13.0
>
>
> [~lemire] discusses this topic in https://lemire.me/blog/2018/05/16/validating-utf-8-strings-using-as-little-as-0-7-cycles-per-byte/
> In Java there is also
> https://lemire.me/blog/2018/10/16/validating-utf-8-bytes-java-edition/



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