spock-abadai opened a new issue, #925:
URL: https://github.com/apache/iceberg-python/issues/925
### Apache Iceberg version
main (development)
### Please describe the bug 🐞
On one of my iceberg tables, when I load a table and scan it, during the
parsing of the name mapping in the table properties, pydantic issues the
following `ValidationError`:
```
def parse_mapping_from_json(mapping: str) -> NameMapping:
> return NameMapping.model_validate_json(mapping)
E pydantic_core._pydantic_core.ValidationError: 1 validation error for
NameMapping
E 9.names
E Value error, At least one mapped name must be provided for the
field [type=value_error, input_value=[], input_type=list]
E For further information visit
https://errors.pydantic.dev/2.8/v/value_error
```
This seems to be a result of the code in `table/name_mapping.py` in the
method `check_at_least_one`, which (if I understand correctly) checks that all
fields in the name mapping have at least one `name`. However, if I'm reading
the [Iceberg spec](https://iceberg.apache.org/spec/#column-projection)
correctly, it states that:
I'm not 100% sure what scenario lead to this but I can say that the name
mapping we have indeed has a field with id 10 that has an empty list of names.
This field existed at one point in the schema but it seems like it was removed.
In any case, it doesn't seem like requiring that the list of names contain at
least one value is in line with the spec (and it seems that situations where
this isn't the case do happen).
Note that the said iceberg table was never created, written to or modified
using `pyiceberg` (only using spark and trino). `pyiceberg` is only used to
read.
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