Replaced QueryWrapper single usage with RawSQL.

django/db/models/query_utils.py

@@ -30,20 +30,6 @@ def subclasses(cls):
         yield from subclasses(subclass)
 
 
-class QueryWrapper:
-    """
-    A type that indicates the contents are an SQL fragment and the associate
-    parameters. Can be used to pass opaque data to a where-clause, for example.
-    """
-    contains_aggregate = False
-
-    def __init__(self, sql, params):
-        self.data = sql, list(params)
-
-    def as_sql(self, compiler=None, connection=None):
-        return self.data
-
-
 class Q(tree.Node):
     """
     Encapsulate filters as objects that can then be combined logically (using

django/db/models/sql/compiler.py

@@ -7,9 +7,7 @@ from django.core.exceptions import EmptyResultSet, FieldError
 from django.db.models.constants import LOOKUP_SEP
 from django.db.models.expressions import OrderBy, Random, RawSQL, Ref, Value
 from django.db.models.functions import Cast
-from django.db.models.query_utils import (
+from django.db.models.query_utils import Q, select_related_descend
-    Q, QueryWrapper, select_related_descend,
-)
 from django.db.models.sql.constants import (
     CURSOR, GET_ITERATOR_CHUNK_SIZE, MULTI, NO_RESULTS, ORDER_DIR, SINGLE,
 )
@@ -1139,7 +1137,7 @@ class SQLCompiler:
             lhs_sql, lhs_params = self.compile(select_col)
             rhs = '%s.%s' % (qn(alias), qn2(columns[index]))
             self.query.where.add(
-                QueryWrapper('%s = %s' % (lhs_sql, rhs), lhs_params), 'AND')
+                RawSQL('%s = %s' % (lhs_sql, rhs), lhs_params), 'AND')
 
         sql, params = self.as_sql()
         return 'EXISTS (%s)' % sql, params