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https://issues.apache.org/jira/browse/ARROW-5409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17662433#comment-17662433
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Rok Mihevc commented on ARROW-5409:
-----------------------------------
This issue has been migrated to [issue
#21863|https://github.com/apache/arrow/issues/21863] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] Improvement for IsIn Kernel when right array is small
> -----------------------------------------------------------
>
> Key: ARROW-5409
> URL: https://issues.apache.org/jira/browse/ARROW-5409
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Preeti Suman
> Priority: Major
> Labels: good-first-issue
> Attachments: set_lookup_benchmark
>
>
> The core of the algorithm (as python) is
> {code:java}
> for i, elem in array:
> output[i] = (elem in memo_table)
> {code}
> Often the right operand list will be very small, in this case, the hashtable
> should be replaced with a constant vector.
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