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https://issues.apache.org/jira/browse/ARROW-1559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258230#comment-16258230
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ASF GitHub Bot commented on ARROW-1559:
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wesm commented on issue #1266: ARROW-1559: [C++] Add Unique kernel and refactor
DictionaryBuilder to be a stateful kernel
URL: https://github.com/apache/arrow/pull/1266#issuecomment-345473160
I think the hash functions we are using are pretty expensive. We don't need
super high quality hash functions for this code, they only need to be
reasonable but use limited CPU cycles. We're also going to want to add SSE4.2
accelerated versions (since sse4.2 has instrinsics for crc32 hashes) that we
select at runtime if the host processor supports it
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> [C++] Kernel implementations for "unique" (compute distinct elements of array)
> ------------------------------------------------------------------------------
>
> Key: ARROW-1559
> URL: https://issues.apache.org/jira/browse/ARROW-1559
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Uwe L. Korn
> Labels: Analytics, pull-request-available
> Fix For: 0.8.0
>
>
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