Add files support for parquet field_ids

[MrDerecho]

Feature Request / Improvement

Would it be possible to allow for parquet field_id support in the add_files method? Parquet field id's are a requirement for backwards compatibility with spark based tools- and also, files created by these systems would have field_ids present in the parquet files. This would allow for mass-migrations of spark generated iceberg objects without SerDe (reprocessing the parquet files) to be supported by pyiceberg.

[kevinjqliu]

allow for parquet field_id support in the add_files method?

this is already done automatically based on the table metadata.

iceberg-python/pyiceberg/table/__init__.py

Lines 855 to 858 in 89e71c3

	if self.table_metadata.name_mapping() is None:
	self.set_properties(
	**{TableProperties.DEFAULT_NAME_MAPPING: self.table_metadata.schema().name_mapping.model_dump_json()}
	)

You can also specify your own name-mapping by updating the table properties

[Erigara]

If you try to add parquet files which already have field ids you would get this error.

[ForeverAngry]

I think @MrDerecho is wanting a feature added so that add_files() ignores field ids that are present in existing parquet files.

[jeroko]

I was also affected by this constraint, so I created a PR to relax it and only fail if the field IDs from the file are not compatible with the table's field IDs.