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Posted to jira@arrow.apache.org by "Niranda Perera (Jira)" <ji...@apache.org> on 2021/12/01 16:31:00 UTC

[jira] [Created] (ARROW-14946) [C++][Python] An operator for finding indices of a value

Niranda Perera created ARROW-14946:
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             Summary: [C++][Python] An operator for finding indices of a value 
                 Key: ARROW-14946
                 URL: https://issues.apache.org/jira/browse/ARROW-14946
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++, Python
            Reporter: Niranda Perera


As discussed in this mail thread [1], it would be nice to have a search operator returning the indices of a Value. 

ex:
{code:java}
values = pa.array([1, 2, 2, 3, 4, 1])
indices = find_indices(values, 1) #  expected = [0, 5]{code}
currently there is an option to get the "first index" of a value using aggregates.index method. This would be a binary vector kernel IMO. 


This is somewhat similar to `numpy.where` [2] but without a `y` input. 

 

[1] [https://lists.apache.org/thread/o8d4m905fxswcg0qjjx7gj3ql2d582k4]


[2] https://numpy.org/doc/stable/reference/generated/numpy.where.html



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