Update comment

Author: koenvo

pyiceberg/table/upsert_util.py

@@ -72,8 +72,6 @@ def get_rows_to_update(source_table: pa.Table, target_table: pa.Table, join_cols
         # When the target table is empty, there is nothing to update :)
         return source_table.schema.empty_table()
 
-    # When we are not able to compare (e.g. due to unsupported types),
-    # fall back to selecting only rows in the source table that do NOT already exist in the target.
     # See: https://github.com/apache/arrow/issues/35785
     MARKER_COLUMN_NAME = "__from_target"
     SOURCE_INDEX_COLUMN_NAME = "__source_index"

tests/table/test_upsert.py

@@ -520,7 +520,6 @@ def test_upsert_struct_field_fails_in_join(catalog: Catalog) -> None:
         NestedField(
             2,
             "nested_type",
-            # Struct<type: string, coordinates: list<double>>
             StructType(
                 NestedField(3, "sub1", StringType(), required=True),
                 NestedField(4, "sub2", StringType(), required=True),