gabeiglio commented on code in PR #1443:
URL: https://github.com/apache/iceberg-python/pull/1443#discussion_r1941731592
##########
pyiceberg/io/pyarrow.py:
##########
@@ -1216,6 +1218,45 @@ def _field_id(self, field: pa.Field) -> int:
return -1
+def _get_column_projection_values(
+ file: DataFile, projected_schema: Schema, partition_spec:
Optional[PartitionSpec], file_project_field_ids: Set[int]
+) -> Tuple[bool, Dict[str, Any]]:
+ """Apply Column Projection rules to File Schema."""
+ project_schema_diff =
projected_schema.field_ids.difference(file_project_field_ids)
+ should_project_columns = len(project_schema_diff) > 0
+ projected_missing_fields: Dict[str, Any] = {}
+
+ if not should_project_columns:
+ return False, {}
+
+ partition_schema: StructType
+ accessors: Dict[int, Accessor]
+
+ if partition_spec is not None:
+ partition_schema = partition_spec.partition_type(projected_schema)
+ accessors = build_position_accessors(partition_schema)
+ else:
+ return False, {}
+
+ for field_id in project_schema_diff:
+ for partition_field in partition_spec.fields_by_source_id(field_id):
+ if isinstance(partition_field.transform, IdentityTransform):
+ accesor = accessors.get(partition_field.field_id)
Review Comment:
huh weird that my local linter did not catch that, thanks!
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