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Posted to jira@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2022/01/25 19:35:00 UTC
[jira] [Updated] (ARROW-15455) [C++] Cast between fixed size list type and variable size list
[ https://issues.apache.org/jira/browse/ARROW-15455?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Li updated ARROW-15455:
-----------------------------
Labels: good-second-issue kernel (was: kernel)
> [C++] Cast between fixed size list type and variable size list
> ---------------------------------------------------------------
>
> Key: ARROW-15455
> URL: https://issues.apache.org/jira/browse/ARROW-15455
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Joris Van den Bossche
> Priority: Major
> Labels: good-second-issue, kernel
>
> Casting from fixed size list to variable size list could be possible, I think, but currently doesn't work:
> {code:python}
> >>> fixed_size = pa.array([[1, 2], [3, 4]], type=pa.list_(pa.int64(), 2))
> >>> fixed_size.cast(pa.list_(pa.int64()))
> ...
> ArrowNotImplementedError: Unsupported cast from fixed_size_list<item: int64>[2] to list using function cast_list
> {code}
> And in principle, a cast the other way around could also be possible if it is checked that each list has the correct length.
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