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Joris Van den Bossche commented on ARROW-9430:
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I am not sure that's the best way to implement it. "if_else" is a scalar kernel
that works element-wise, where mask/values/array need to have the same length
(or is a scalar that is broadcasted). While for the setitem operation here, the
"values" to set (or replace) based on the mask have a different length
(matching the number of {{true}} values in the mask). In principle we could
first convert that array to an array of the correctly length, and then use
"if_else", but not sure how efficient that would be compared to a custom
implementation.
> [C++/Python] Kernel for SetItem(BooleanArray, values)
> -----------------------------------------------------
>
> Key: ARROW-9430
> URL: https://issues.apache.org/jira/browse/ARROW-9430
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++, Python
> Reporter: Uwe Korn
> Assignee: David Li
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> We should have a kernel that allows overriding the values of an array by
> supplying a boolean mask and a scalar or an array of equal length.
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