Re: [I] [Python][Parquet] pa.schema() silently drops metadata if a schema object is passed [arrow]

["JacobHayes (via GitHub)" <gi...@apache.org>]

JacobHayes commented on issue #38575:
URL: https://github.com/apache/arrow/issues/38575#issuecomment-2094276951

   I came across this too - it also appears to also happen if you pass a `pa.struct` into `pa.schema`, eg:
   ```python
   [I] ~/s/g/a/artigraph (misc|●4✚3) $ python3
   Python 3.12.2 (main, May  3 2024, 17:50:09) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import pyarrow as pa
   >>> pa.__version__
   '16.0.0'
   >>> pa.schema([pa.field("test", pa.int64())], metadata={"a": "b"})
   test: int64
   -- schema metadata --
   a: 'b'
   >>> pa.schema(pa.struct([pa.field("test", pa.int64())]), metadata={"a": "b"})
   test: int64
   ```


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