You are viewing a plain text version of this content. The canonical link for it is here.

Posted to jira@arrow.apache.org by "Antoine Pitrou (Jira)" <ji...@apache.org> on 2022/05/18 20:24:00 UTC

[jira] [Updated] (ARROW-16611) MapArray pandas round trip is broken

     [ https://issues.apache.org/jira/browse/ARROW-16611?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou updated ARROW-16611:
-----------------------------------
    Component/s: 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: Minor
>
> 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)`



--
This message was sent by Atlassian Jira
(v8.20.7#820007)