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https://issues.apache.org/jira/browse/ARROW-10438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17268335#comment-17268335
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Weston Pace commented on ARROW-10438:
-------------------------------------
Ah, even worse, it appears to be configurable...
{quote}
h5. hive.exec.default.partition.name
* Default Value: {{__HIVE_DEFAULT_PARTITION__}}
* Added In: Hive 0.6.0
The default partition name in case the dynamic partition column value is
null/empty string or any other values that cannot be escaped. This value must
not contain any special character used in HDFS URI (e.g., ':', '%', '/' etc).
The user has to be aware that the dynamic partition value should not contain
this value to avoid confusions.
{quote}
> [C++][Dataset] Partitioning::Format on nulls
> --------------------------------------------
>
> Key: ARROW-10438
> URL: https://issues.apache.org/jira/browse/ARROW-10438
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Affects Versions: 2.0.0
> Reporter: Ben Kietzman
> Assignee: Weston Pace
> Priority: Major
> Fix For: 4.0.0
>
>
> Writing a dataset with null partition keys is currently untested. Ensure the
> behavior is documented and correct
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