Re: [PR] Read partitioned tables with source field missing from schema [iceberg-python]

["geruh (via GitHub)" <gi...@apache.org>]

geruh commented on code in PR #2367:
URL: https://github.com/apache/iceberg-python/pull/2367#discussion_r2575096299


##########
tests/table/test_partitioning.py:
##########
@@ -178,6 +179,19 @@ def test_partition_type(table_schema_simple: Schema) -> None:
     )
 
 
+def test_partition_type_missing_source_field(table_schema_simple: Schema) -> None:
+    spec = PartitionSpec(
+        PartitionField(source_id=1, field_id=1000, transform=TruncateTransform(width=19), name="str_truncate"),
+        PartitionField(source_id=10, field_id=1001, transform=BucketTransform(num_buckets=25), name="int_bucket"),
+        spec_id=3,
+    )
+
+    assert spec.partition_type(table_schema_simple) == StructType(
+        NestedField(field_id=1000, name="str_truncate", field_type=StringType(), required=False),
+        NestedField(field_id=1001, name="int_bucket", field_type=UnknownType(), required=False),
+    )
+
+

Review Comment:
   Can we also add a test or two to ensure that the behavior of `partition_to_path` is correct



##########
pyiceberg/partitioning.py:
##########
@@ -222,11 +223,13 @@ def partition_type(self, schema: Schema) -> StructType:
         :return: A StructType that represents the PartitionSpec, with a NestedField for each PartitionField.
         """
         nested_fields = []
+        schema_ids = index_by_id(schema)
         for field in self.fields:
-            source_type = schema.find_type(field.source_id)
-            result_type = field.transform.result_type(source_type)
-            required = schema.find_field(field.source_id).required
-            nested_fields.append(NestedField(field.field_id, field.name, result_type, required=required))
+            if source_field := schema_ids.get(field.source_id):
+                result_type = field.transform.result_type(source_field.field_type)
+                nested_fields.append(NestedField(field.field_id, field.name, result_type, required=source_field.required))
+            else:

Review Comment:
   Nit: can we add a comment here to explain why the `UnknownType` is used



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