[jira] [Created] (ARROW-7362) [Python] ListArray.flatten() should take care of slicing offsets

["Zhuo Peng (Jira)" <ji...@apache.org>]

Zhuo Peng created ARROW-7362:
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             Summary: [Python] ListArray.flatten() should take care of slicing offsets
                 Key: ARROW-7362
                 URL: https://issues.apache.org/jira/browse/ARROW-7362
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: Zhuo Peng
            Assignee: Zhuo Peng


Currently ListArray.flatten() simply returns the child array. If a ListArray is a slice of another ListArray, they will share the same child array, however the expected behavior (I think) of flatten() should be returning an Array that's a concatenation of all the sub-lists in the ListArray, so the slicing offset should be taken into account.

 

For example:

a = pa.array([[1], [2], [3]])

assert a.flatten().equals(pa.array([1,2,3]))

# expected:

a.slice(1).flatten().equals(pa.array([2, 3]))



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