[ARROW-10000] [C++][Python] Support constructing StructArray from list of key-value pairs

• 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/26025
• Assignee: Krisztian Szucs
• Reporter: Krisztian Szucs
• Created: 14/Sep/20 15:48
• Updated: 11/Jan/23 08:10
• Resolved: 28/Sep/20 09:21

Description

item = [
    ('a', 1),
    ('b', 2)
]
ty = pa.struct([
    pa.field('a', type=pa.int8()),
    pa.field('b', type=pa.float64())
])
pa.array([item], type=ty)

raises

ArrowTypeError: Could not convert [('a', 1), ('b', 2)] with type list: was not a dict, tuple, or recognized null value for conversion to struct type

This feature is required for pa.repeat(scalar, n) roundtrip if the type contains duplicated field names.

Issue Links

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