djkapner opened a new issue, #41699:
URL: https://github.com/apache/arrow/issues/41699
### Describe the bug, including details regarding any error messages,
version, and platform.
When a `SortingColumn` is present, the metadata of a `ParquetFile` can not
be serialized with `to_dict()` because `SortingColumn` is missing this method.
```
import polars as pl
import pyarrow.parquet as pq
df = pl.DataFrame({"a": [1, 2], "b": [10, 11]})
fname = "tmp.parquet"
pq.write_table(
df.to_arrow(),
fname,
sorting_columns=[pq.SortingColumn(0),],
)
pqf = pq.ParquetFile(fname)
print(pqf.metadata.row_group(0).sorting_columns[0])
print(pqf.metadata.to_dict())
```
results in :
```
SortingColumn(column_index=0, descending=False, nulls_first=False)
...
File "pyarrow/_parquet.pyx", line 892, in
pyarrow._parquet.FileMetaData.to_dict
File "pyarrow/_parquet.pyx", line 790, in
pyarrow._parquet.RowGroupMetaData.to_dict
AttributeError: 'pyarrow._parquet.SortingColumn' object has no attribute
'to_dict'
```
### Component(s)
Parquet, Python
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