ndrluis commented on issue #751:
URL: https://github.com/apache/iceberg-python/issues/751#issuecomment-2132521441
The problem is not with append; it is something occurring when we call
model_copy(deep=True) on the metadata object.
When I was debugging, I couldn't find where the update was occurring. So, I
did a sanity check by creating a table and then calling
table.metadata.model_copy(deep=True), and then I was able to reproduce the
error.
```python
def test_schema_mutation(catalog: SqlCatalog, table_schema_decimal: Schema,
random_identifier: Identifier) -> None:
database_name, _table_name = random_identifier
catalog.create_namespace(database_name)
table = catalog.create_table(random_identifier, table_schema_decimal)
schema = table.schema()
schema_copy = table.metadata.model_copy(deep=True).schemas[0]
assert schema == schema_copy
```
Where table_schema_decimal is:
```python
Schema(
NestedField(field_id=1, name="integer", field_type=IntegerType(),
required=True),
NestedField(field_id=2, name="decimal_32_2", field_type=DecimalType(32,
2), required=False),
NestedField(field_id=3, name="decimal_32_16", field_type=DecimalType(32,
16), required=False),
schema_id=0,
identifier_field_ids=[1],
)
```
I will continue trying to understand what is happening, but I don't know if
some other contributor can help me to understand where the problem is.
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