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https://issues.apache.org/jira/browse/ARROW-4501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661523#comment-17661523
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Rok Mihevc commented on ARROW-4501:
-----------------------------------
This issue has been migrated to [issue
#21053|https://github.com/apache/arrow/issues/21053] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] Unique returns non-unique strings
> ---------------------------------------
>
> Key: ARROW-4501
> URL: https://issues.apache.org/jira/browse/ARROW-4501
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Ilya Tokar
> Assignee: Ilya Tokar
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.12.1, 0.13.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 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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