[jira] [Created] (ARROW-14592) [C++] list_parent_indices output type should not depend on input type

["Antoine Pitrou (Jira)" <ji...@apache.org>]

Antoine Pitrou created ARROW-14592:
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             Summary: [C++] list_parent_indices output type should not depend on input type
                 Key: ARROW-14592
                 URL: https://issues.apache.org/jira/browse/ARROW-14592
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Antoine Pitrou


Currently, the {{list_parent_indices}} output type is the input list offset type. But that doesn't really make sense: the parent indices are simply indices in the list array, they are not bounded by the offset size (even a list array with 32-bit offsets can have a length larger than 2**32, for example if it's mostly nulls).



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