[jira] [Commented] (ARROW-17832) [Python] Construct MapArray from sequence of dicts (instead of list of tuples)

["Aldrin Montana (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-17832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17608866#comment-17608866 ] 

Aldrin Montana commented on ARROW-17832:
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at a first glance, it seems like [pyarrow.array()|https://github.com/apache/arrow/blob/f0303652b4934a9f767dca88268016c69375687d/python/pyarrow/array.pxi#L117] needs another condition ([like _is_array_like|https://github.com/apache/arrow/blob/f0303652b4934a9f767dca88268016c69375687d/python/pyarrow/array.pxi#L232]) that checks for a mapping type and then converts the mapping type into an appropriate array?

and maybe [code for converting pandas categorical types|https://github.com/apache/arrow/blob/f0303652b4934a9f767dca88268016c69375687d/python/pyarrow/array.pxi#L264] can be reused?

> [Python] Construct MapArray from sequence of dicts (instead of list of tuples)
> ------------------------------------------------------------------------------
>
>                 Key: ARROW-17832
>                 URL: https://issues.apache.org/jira/browse/ARROW-17832
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Python
>            Reporter: Joris Van den Bossche
>            Priority: Major
>              Labels: python-conversion
>
> From https://github.com/apache/arrow/issues/14116
> Creating a MapArray from a python sequence currently requires lists of tuples as values:
> {code}
> arr = pa.array([[('a', 1), ('b', 2)], [('c', 3)]], pa.map_(pa.string(), pa.int64()))
> {code}
> While I think it makes sense that the following could also work (using dicts instead):
> {code}
> arr = pa.array([{'a': 1, 'b': 2}, {'c': 3}], pa.map_(pa.string(), pa.int64()))
> {code}



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