p1c2u commented on issue #1798:
URL:
https://github.com/apache/iceberg-python/issues/1798#issuecomment-2737554034
@kevinjqliu
after investigation I found out it happens after I append pyarrow table
without list field specified in schema as optional.
Example table with schema
```python
from pyiceberg.catalog import load_catalog
catalog = load_catalog(**dict(type="in-memory"))
from pyiceberg.schema import Schema
from pyiceberg.types import NestedField, StringType, DoubleType, LongType,
ListType
schema = Schema(
NestedField(field_id=1, name="name", field_type=StringType(),
required=False),
NestedField(
field_id=3,
name="my_list",
field_type=ListType(
element_id=45, element=StringType(), element_required=False
),
required=False,
),
)
catalog.create_namespace_if_not_exists("test")
catalog.create_table_if_not_exists("test.table", schema)
```
I append dataset with my_list:
```python
import pyarrow as pa
df_1 = pa.Table.from_pylist([
{"name": "one", "my_list": ["test"]},
{"name": "another", "my_list": ["test"]},
])
catalog.load_table("test.table").append(df_1)
```
Read works
```python
catalog.load_table("test.table").scan().to_arrow()
```
I append dataset without my_list:
```python
import pyarrow as pa
df_2 = pa.Table.from_pylist([
{"name": "one"},
{"name": "another"},
])
catalog.load_table("test.table").append(df_2)
```
This time it won't work
```python
catalog.load_table("test.table").scan().to_arrow()
```
it will throw
> ValueError: Parquet file does not have field-ids and the Iceberg table
does not have 'schema.name-mapping.default' defined
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