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https://issues.apache.org/jira/browse/ARROW-5409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17394031#comment-17394031
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Antoine Pitrou commented on ARROW-5409:
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[~niranda]
> [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
> Attachments: set_lookup_benchmark
>
>
> The core of the algorithm (as python) is
> {code:java}
> for idx, 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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