Rename collect_sub_fields to collect_subfields

In order to make this correspond better to GraphQL-js
where it is collectSubfields, not collectSubFields.

Author: Cito

src/graphql/execution/collect_fields.py

@@ -20,7 +20,7 @@
 from .values import get_directive_values
 
 
-__all__ = ["collect_fields", "collect_sub_fields"]
+__all__ = ["collect_fields", "collect_subfields"]
 
 
 def collect_fields(
@@ -47,19 +47,19 @@ def collect_fields(
     return fields
 
 
-def collect_sub_fields(
+def collect_subfields(
     schema: GraphQLSchema,
     fragments: Dict[str, FragmentDefinitionNode],
     variable_values: Dict[str, Any],
     return_type: GraphQLObjectType,
     field_nodes: List[FieldNode],
 ) -> Dict[str, List[FieldNode]]:
-    """Collect sub fields.
+    """Collect subfields.
 
     Given a list of field nodes, collects all the subfields of the passed in fields,
     and returns them at the end.
 
-    collect_sub_fields requires the "return type" of an object. For a field that
+    collect_subfields requires the "return type" of an object. For a field that
     returns an Interface or Union type, the "return type" will be the actual
     object type returned by that field.
 

src/graphql/execution/execute.py

@@ -55,7 +55,7 @@
     is_non_null_type,
     is_object_type,
 )
-from .collect_fields import collect_fields, collect_sub_fields
+from .collect_fields import collect_fields, collect_subfields
 from .middleware import MiddlewareManager
 from .values import get_argument_values, get_variable_values
 
@@ -948,7 +948,7 @@ def collect_subfields(
         )
         sub_field_nodes = cache.get(key)
         if sub_field_nodes is None:
-            sub_field_nodes = collect_sub_fields(
+            sub_field_nodes = collect_subfields(
                 self.schema,
                 self.fragments,
                 self.variable_values,