[jira] [Updated] (ARROW-13681) [C++] list_parent_indices only computes for first chunk

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

     [ https://issues.apache.org/jira/browse/ARROW-13681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou updated ARROW-13681:
-----------------------------------
    Summary: [C++] list_parent_indices only computes for first chunk  (was: pyarrow.compute.list_parent_indices only computes for first chunk)

> [C++] list_parent_indices only computes for first chunk
> -------------------------------------------------------
>
>                 Key: ARROW-13681
>                 URL: https://issues.apache.org/jira/browse/ARROW-13681
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Tor Eivind McKenzie-Syvertsen
>            Priority: Major
>
> Pyarrow version: 5.0.0. 
> Python version: 3.7.9
> I came across this issue due to very unexpected behaviour from the "explode" function obtained here:
> https://issues.apache.org/jira/browse/ARROW-12099
>  indices = pc.list_parent_indices(table[col_name])
> if table[column] in this example contains several chunks, the indices will look perfectly fine for that chunk, but erratic and unexpected results for second chunk.
>  No warning or info was given either
> A workaround that solved the problem for me is:
> {code:java}
>   indices = pc.list_parent_indices(table.combine_chunks()[col_name])
> {code}
> The behaviour then changes dramatically.
> I'm assuming this isnt expected and should be fixed?



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