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https://issues.apache.org/jira/browse/ARROW-14782?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17564145#comment-17564145
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Joris Van den Bossche commented on ARROW-14782:
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> Object columns in Pandas are currently converted to Null type columns in Arrow
Small clarification: object columns in pandas are converted to null type in
Arrow _only_ if they contain all missing values.
> [C++][Python] The ORC writer does not support all-null object columns from
> Pandas
> ---------------------------------------------------------------------------------
>
> Key: ARROW-14782
> URL: https://issues.apache.org/jira/browse/ARROW-14782
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Reporter: Ian Alexander Joiner
> Assignee: Ian Alexander Joiner
> Priority: Minor
> Labels: orc
> Fix For: 10.0.0
>
>
> Object columns in Pandas are currently converted to Null type columns in
> Arrow and they can not be written using `pyarrow.orc.write_table`. Since ORC
> doesn't support Null type columns we need to find the appropriate DataType
> for such columns and do the write.
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