sfc-gh-zpeng opened a new issue, #33763:
URL: https://github.com/apache/arrow/issues/33763
### Describe the bug, including details regarding any error messages,
version, and platform.
A map type can be created with the key and the item fields. And custom KV
metadata can be attached to those fields. However, when creating such a type
using pyarrow.map_(), the field level metadata are not taken. For example:
```
map_type = pa.map_(
pa.field("key", pa.string(), nullable=False, metadata={"abc": "1"}),
pa.field("value", pa.int32(), metadata={"abc": "2"}))
```
`map_type.key_field.metadata` is None, but it's expected to be `{"abc":
"1"}`.
I believe it's a bug in pyarrow. Specifically at this line:
https://github.com/apache/arrow/blob/1d9366f19e4b9846b33cc0c7bd7941cb5f482d74/python/pyarrow/types.pxi#L2929
A new field is created and used but without the metadata of the input field.
Also see:
https://colab.research.google.com/drive/1ixsRK02I0aItU9FlHQf14IArWwR5ugiA#scrollTo=mzkPfZ5h6Td6
### Component(s)
Python
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