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https://issues.apache.org/jira/browse/ARROW-2665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16500391#comment-16500391
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Uwe L. Korn commented on ARROW-2665:
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Yes, they need to live on the cpp side as this is an element-wise operation on
an array.
> [Python/C++] Add index() method to find first occurence of Python scalar
> ------------------------------------------------------------------------
>
> Key: ARROW-2665
> URL: https://issues.apache.org/jira/browse/ARROW-2665
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, Python
> Reporter: Uwe L. Korn
> Priority: Major
>
> Python lists have an {{index(x, start, end)}} method to find the first
> occurence of an element. We should add a method with the same interface
> supporting Python scalars on the typical triplet
> {{Array/ChunkedArray/Columns}}.
> See also
> https://docs.python.org/3.6/tutorial/datastructures.html#more-on-lists
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