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Posted to issues@arrow.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2019/02/07 21:15:00 UTC
[jira] [Updated] (ARROW-4501) [C++] Unique returns non-unique
strings
[ https://issues.apache.org/jira/browse/ARROW-4501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated ARROW-4501:
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Labels: pull-request-available (was: )
> [C++] Unique returns non-unique strings
> ---------------------------------------
>
> Key: ARROW-4501
> URL: https://issues.apache.org/jira/browse/ARROW-4501
> Project: Apache Arrow
> Issue Type: Bug
> Reporter: Ilya Tokar
> Priority: Major
> Labels: pull-request-available
>
> Calling Unique on e. g. \{"some long string data","some long string data","other data"} returns
> dictionary with "some long string data" appearing twice. This is caused by off by 1 error in DoubleCrcHash, which caused it to read 1 byte past the end of the strings with length higher than 16, and not divisible by 4. In such cases, we never hash p[0], and we always read one extra byte.
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