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https://issues.apache.org/jira/browse/ARROW-16611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17539065#comment-17539065
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Antoine Pitrou commented on ARROW-16611:
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Hmm, where does the "java.lang.RuntimeException" come from?
> [Python] MapArray pandas round trip is broken
> ---------------------------------------------
>
> Key: ARROW-16611
> URL: https://issues.apache.org/jira/browse/ARROW-16611
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Affects Versions: 8.0.0
> Reporter: Robbie Gruener
> Priority: Major
>
> pyarrow.MapArray when converted to pandas cannot be successfully converted
> back.
> The following snipper does not work:
>
> ```
> import pyarrow as pa
> data = [[('x', 1), ('y', 0)], [('a', 2), ('b', 45)]]
> ty = pa.map_(pa.string(), pa.int64())
> map_col = pa.array(data, type=ty)
> pa.MapArray.from_pandas(map_col.to_pandas())
> ```
> `Uncaught exception: ArrowTypeError: Expected bytes, got a 'int' object
> (java.lang.RuntimeException)`
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