cgbur commented on issue #716:
URL: https://github.com/apache/iceberg-python/issues/716#issuecomment-2101251170
Ah, confusingly there appears to be writer differences that cause the issue.
My Rust pyarrow implementation matches when polars has `pyarrow=True`.
```python
import polars as pl
import pyarrow.parquet as pq
df = pl.DataFrame(
{
"a": [[{"a": 1}, {"a": 2}], [{"a": 3}]],
}
)
def print_schema_path(path, col_name):
metadata = pq.read_metadata(path)
for group_number in range(metadata.num_row_groups):
row_group = metadata.row_group(group_number)
for column_number in range(row_group.num_columns):
column = row_group.column(column_number)
if column.path_in_schema.startswith(col_name):
print(f"path_in_schema: {column.path_in_schema}")
df.write_parquet("example.parquet", use_pyarrow=False)
print("with polars")
print(pq.read_schema("example.parquet"))
print_schema_path("example.parquet", "a")
df.write_parquet("example.parquet", use_pyarrow=True)
print("with pyarrow")
print(pq.read_schema("example.parquet"))
print_schema_path("example.parquet", "a")
```
```
with polars
a: large_list<item: struct<a: int64>>
child 0, item: struct<a: int64>
child 0, a: int64
path_in_schema: a.list.item.a
with pyarrow
a: large_list<element: struct<a: int64>>
child 0, element: struct<a: int64>
child 0, a: int64
path_in_schema: a.list.element.a
```
Perhaps the visitor is not respecting the name used in the schema? Or there
is a mismatch in the method used to acquire between the iceberg and parquet
change?
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