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https://issues.apache.org/jira/browse/ARROW-7362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16992631#comment-16992631
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Joris Van den Bossche commented on ARROW-7362:
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Yes, the main thing is that {{offsets}} and one of {{values}}/{{flatten()}}
need to match. Currently I implemented {{offsets}} such that they are sliced
themselves but point into the unsliced values.
> [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
> Priority: Minor
>
> 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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