0x26res opened a new issue, #36809:
URL: https://github.com/apache/arrow/issues/36809
### Describe the bug, including details regarding any error messages,
version, and platform.
It is possible to customize the name of the value field for `pa.MapType`. I
believe it's a niche feature used for compatibility with parquet and it doesn't
change the semantic of the map type.
this feature causes a KeyError in `MapScalar.as_py`:
```
def test_bug_in_pyarrow():
assert pa.scalar(
[("foo", "bar")],
pa.map_(
pa.string(),
pa.field("value", pa.string()),
),
).as_py() == [("foo", "bar")]
with pytest.raises(KeyError, match=r"value"):
pa.scalar(
[("foo", "bar")],
pa.map_(
pa.string(),
pa.field("map_value", pa.string()),
),
).as_py()
```
### Component(s)
Python
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