Antoine Pitrou created ARROW-2341:
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Summary: [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
{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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