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https://issues.apache.org/jira/browse/ARROW-2341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16409678#comment-16409678
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ASF GitHub Bot commented on ARROW-2341:
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pitrou opened a new pull request #1778: ARROW-2341: [Python] Improve pa.union()
mode argument behaviour
URL: https://github.com/apache/arrow/pull/1778
Also:
- make UnionType.mode return a string ('sparse' or 'dense')
- make UnionType indexing return fields, not types (like StructType)
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> [Python] pa.union() mode argument unintuitive
> ---------------------------------------------
>
> Key: ARROW-2341
> URL: https://issues.apache.org/jira/browse/ARROW-2341
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Python
> Affects Versions: 0.9.0
> Reporter: Antoine Pitrou
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: pull-request-available
>
> {code:python}
> >>> pa.union([pa.field('x', pa.int16())], 'sparse')
> UnionType(union[dense]<x: int16=0>)
> >>> pa.union([pa.field('x', pa.int16())], 'dense')
> UnionType(union[dense]<x: int16=0>)
> >>> pa.union([pa.field('x', pa.int16())], 42)
> UnionType(union[dense]<x: int16=0>)
> {code}
> I would suggest allowing "sparse" and "dense" strings as aliases to the
> internal enum values, and disallowing everything else.
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