JacobWBradford opened a new issue, #44741: URL: https://github.com/apache/arrow/issues/44741
### Describe the bug, including details regarding any error messages, version, and platform. There appears to be some ambiguity the `names` attribute on `pyarrow.parquet.ParquetSchema` vs `pyarrow.Schema` when it comes to nested logical type columns. I generated a parquet file with three columns, one containing list objects and the other two containing strings. When loading the two available schemas from `pyarrow.parquet.ParquetFile` (`schema` and `schema_arrow`), the corresponding `<schema>.names` differ for the List type column. `schema_arrow` appears to correctly list the column name, whereas `schema` lists the name of the lowest-level field in the structure (which, going off of the [Logical Types documentation ](https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#lists)would usually be `element`). I've included a simple example below, tested using pyarrow 17.0.0 ```python import pandas as pd import pyarrow as pa import pyarrow.parquet as pq # Create parquet file filepath = `new_parquet_file.parquet` df = pd.DataFrame({'random_strings1': ["string1", "string2", "string3"], 'my_list': [[1, 2, 3], [4, 5, 6], [7, 8, 9]], 'random_strings2': ["string4", "string5", "string6"]}) table = pa.Table.from_pandas(df) pq.write_table(table, filepath) # Examine parquet file schema with pq.ParquetFile(filepath) as file: print(file.schema.names) print(file.schema_arrow.names) ``` ``` ['random_strings1', 'element', 'random_strings2'] ['random_strings1', 'my_list', 'random_strings2'] ``` Is this intended behavior from `pyarrow.parquet.ParquetSchema`? The inclusion of `schema_arrow` means it's still trivial to get the names of the columns, but it still poses a problem for those who aren't aware of the logic. ### Component(s) Documentation, Python -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@arrow.apache.org.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
