Fixed #31758 -- Removed unneeded BytesToCharFieldConversionMixin.

Bug was fixed in mysqlclient 1.3.13.

django/db/backends/base/features.py

@@ -253,9 +253,6 @@ class BaseDatabaseFeatures:
     # Does the backend support keyword parameters for cursor.callproc()?
     supports_callproc_kwargs = False
 
-    # Convert CharField results from bytes to str in database functions.
-    db_functions_convert_bytes_to_str = False
-
     # What formats does the backend EXPLAIN syntax support?
     supported_explain_formats = set()
 

django/db/backends/mysql/features.py

@@ -41,7 +41,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
             SET V_I = P_I;
         END;
     """
-    db_functions_convert_bytes_to_str = True
     # Neither MySQL nor MariaDB support partial indexes.
     supports_partial_indexes = False
     supports_order_by_nulls_modifier = False

django/db/models/functions/text.py

@@ -5,22 +5,6 @@ from django.db.models.functions import Coalesce
 from django.db.models.lookups import Transform
 
 
-class BytesToCharFieldConversionMixin:
-    """
-    Convert CharField results from bytes to str.
-
-    MySQL returns long data types (bytes) instead of chars when it can't
-    determine the length of the result string. For example:
-        LPAD(column1, CHAR_LENGTH(column2), ' ')
-    returns the LONGTEXT (bytes) instead of VARCHAR.
-    """
-    def convert_value(self, value, expression, connection):
-        if connection.features.db_functions_convert_bytes_to_str:
-            if self.output_field.get_internal_type() == 'CharField' and isinstance(value, bytes):
-                return value.decode()
-        return super().convert_value(value, expression, connection)
-
-
 class MySQLSHA2Mixin:
     def as_mysql(self, compiler, connection, **extra_content):
         return super().as_sql(
@@ -172,7 +156,7 @@ class Lower(Transform):
     lookup_name = 'lower'
 
 
-class LPad(BytesToCharFieldConversionMixin, Func):
+class LPad(Func):
     function = 'LPAD'
     output_field = CharField()
 
@@ -204,7 +188,7 @@ class Ord(Transform):
         return super().as_sql(compiler, connection, function='UNICODE', **extra_context)
 
 
-class Repeat(BytesToCharFieldConversionMixin, Func):
+class Repeat(Func):
     function = 'REPEAT'
     output_field = CharField()