[ARROW-9999] [Python] Support constructing dictionary array directly through pa.array()

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.0
• Component/s: Python
• External issue URL: https://github.com/apache/arrow/issues/26024
• Assignee: Krisztian Szucs
• Reporter: Krisztian Szucs
• Created: 14/Sep/20 15:41
• Updated: 11/Jan/23 08:10
• Resolved: 28/Sep/20 09:22

Description

pa.array(["some", "string"], type=pa.dictionary(pa.int8(), pa.string)))

raises

ArrowNotImplementedError: Sequence converter for type dictionary<values=string, indices=int8, ordered=0> not implemented

It would be a much more comfortable way than

pa.DictionaryArray.from_arrays(indices, dictionary)

And possibly more efficient as well thanks to the adaptive dictionary builders.

Issue Links

• is fixed by: ARROW-9992 [C++][Python] Refactor python to arrow conversions based on a reusable conversion API