remove redundant deserializer assignment from asyncpg dialect (#13287)

(cherry picked from commit 120a967505efb4a50a9134bf45b8e88aebb9f483)

diff --git a/lib/sqlalchemy/dialects/postgresql/asyncpg.py b/lib/sqlalchemy/dialects/postgresql/asyncpg.py
index d0b10550cd3ad2af10a9c0ac04b8827dc04fa963..f36b45aeade1c920c5ee27e24d83ab13022a753a 100644 (file)
--- a/lib/sqlalchemy/dialects/postgresql/asyncpg.py
+++ b/lib/sqlalchemy/dialects/postgresql/asyncpg.py
@@ -1216,7 +1216,6 @@ class PGDialect_asyncpg(PGDialect):
         """
 
         asyncpg_connection = conn._connection
-        deserializer = self._json_deserializer or _py_json.loads
 
         def _jsonb_encoder(str_value):
             # \x01 is the prefix for jsonb used by PostgreSQL.