  from django.utils.encoding import force_text
  
  from rest_framework import exceptions, serializers
  from rest_framework.compat import uritemplate
  from rest_framework.fields import empty
  
  from .generators import BaseSchemaGenerator
  from .inspectors import ViewInspector
  from .utils import get_pk_description, is_list_view
  
 
</s> remove             return {
 </s> add             mapping = {
from rest_framework.fields import _UnvalidatedField, empty
  from django.utils.encoding import force_text
  
  from rest_framework import exceptions, serializers
  from rest_framework.compat import uritemplate
from rest_framework.fields import _UnvalidatedField, empty
  
  from .generators import BaseSchemaGenerator
  from .inspectors import ViewInspector
  from .utils import get_pk_description, is_list_view
  
keep keep keep keep replace keep keep keep keep keep
 Added mapping of ListField.child type for OpenAPI Schemas. 
rest_framework/schemas/openapi.py