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  1. Apache Arrow
  2. ARROW-7362

[Python] ListArray.flatten() should take care of slicing offsets

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      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]))

      1. expected:

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

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              brillsp Zhuo Peng
              brillsp Zhuo Peng
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