Joris Van den Bossche created ARROW-10640:
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Summary: [C++] A "where" kernel to combine two arrays based on a
mask
Key: ARROW-10640
URL: https://issues.apache.org/jira/browse/ARROW-10640
Project: Apache Arrow
Issue Type: New Feature
Components: C++
Reporter: Joris Van den Bossche
(from discussion in ARROW-9489 with [~maartenbreddels])
A general "where" kernel like {{np.where}}
(https://numpy.org/doc/stable/reference/generated/numpy.where.html) seems a
generally useful kernel to have, and could also help mimicking some other
python (setitem-like) operations.
The concrete use case in ARROW-9489 is to basically do a
{{fill_null(array[string], array[string])}} which could be expressed as
{{where(is_null(arr), arr2, arr)}}.
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