dhirschfeld commented on issue #34554:
URL: https://github.com/apache/arrow/issues/34554#issuecomment-1996620231
Seems to work, though I'm not sure how efficient it is :/
```python
def rename_columns(schema: pa.Schema, **name_mapping) -> pa.RecordBatch:
return pa.schema(
field.with_name(name_mapping.get(field.name, field.name))
for field in schema
)
def append_filename(ds: pa.dataset.Dataset) -> pa.dataset.Dataset:
scanner = ds.scanner(columns=ds.schema.names + ['__filename'])
schema = rename_columns(scanner.projected_schema, __filename='filename')
batches = (
pa.RecordBatch.from_arrays(batch.columns, schema=schema)
for batch in scanner.to_batches()
)
return pa.dataset.dataset(list(batches))
```
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