jorisvandenbossche commented on issue #33763:
URL: https://github.com/apache/arrow/issues/33763#issuecomment-1397332990
Actually, this seems to working fine for me with the latest pyarrow:
```
In [72]: map_type = pa.map_(
...: pa.field("key", pa.string(), nullable=False, metadata={"abc":
"1"}),
...: pa.field("value", pa.int32(), metadata={"abc": "2"}))
...:
In [73]: map_type
Out[73]: MapType(map<string, int32>)
In [74]: map_type.key_field
Out[74]: pyarrow.Field<key: string not null>
In [75]: map_type.key_field.metadata
Out[75]: {b'abc': b'1'}
```
@sfc-gh-zpeng what version of pyarrow are you using?
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