Fixed #36624 -- Dropped support for MySQL < 8.4.

13 files changed, 26 insertions, 118 deletions

diff --git a/django/contrib/gis/db/backends/mysql/operations.py b/django/contrib/gis/db/backends/mysql/operations.py
index f838a79da6..b82bd16abb 100644
--- a/django/contrib/gis/db/backends/mysql/operations.py
+++ b/django/contrib/gis/db/backends/mysql/operations.py
@@ -76,8 +76,6 @@ class MySQLOperations(BaseSpatialOperations, DatabaseOperations):
         if is_mariadb:
             if self.connection.mysql_version < (12, 0, 1):
                 disallowed_aggregates.insert(0, models.Collect)
-        elif self.connection.mysql_version < (8, 0, 24):
-            disallowed_aggregates.insert(0, models.Collect)
         return tuple(disallowed_aggregates)
 
     function_names = {
diff --git a/django/contrib/gis/db/backends/mysql/schema.py b/django/contrib/gis/db/backends/mysql/schema.py
index e485c671e5..78e97bb1ca 100644
--- a/django/contrib/gis/db/backends/mysql/schema.py
+++ b/django/contrib/gis/db/backends/mysql/schema.py
@@ -10,16 +10,6 @@ logger = logging.getLogger("django.contrib.gis")
 class MySQLGISSchemaEditor(DatabaseSchemaEditor):
     sql_add_spatial_index = "CREATE SPATIAL INDEX %(index)s ON %(table)s(%(column)s)"
 
-    def skip_default(self, field):
-        # Geometry fields are stored as BLOB/TEXT, for which MySQL < 8.0.13
-        # doesn't support defaults.
-        if (
-            isinstance(field, GeometryField)
-            and not self._supports_limited_data_type_defaults
-        ):
-            return True
-        return super().skip_default(field)
-
     def quote_value(self, value):
         if isinstance(value, self.connection.ops.Adapter):
             return super().quote_value(str(value))
diff --git a/django/db/backends/mysql/base.py b/django/db/backends/mysql/base.py
index e83dc106f7..d4b98971fa 100644
--- a/django/db/backends/mysql/base.py
+++ b/django/db/backends/mysql/base.py
@@ -144,11 +144,8 @@ class DatabaseWrapper(BaseDatabaseWrapper):
             _data_types["UUIDField"] = "uuid"
         return _data_types
 
-    # For these data types:
-    # - MySQL < 8.0.13 doesn't accept default values and implicitly treats them
-    #   as nullable
-    # - all versions of MySQL and MariaDB don't support full width database
-    #   indexes
+    # For these data types MySQL and MariaDB don't support full width database
+    # indexes.
     _limited_data_types = (
         "tinyblob",
         "blob",
diff --git a/django/db/backends/mysql/features.py b/django/db/backends/mysql/features.py
index 4be20b92ac..3315db6ae9 100644
--- a/django/db/backends/mysql/features.py
+++ b/django/db/backends/mysql/features.py
@@ -66,7 +66,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         if self.connection.mysql_is_mariadb:
             return (10, 6)
         else:
-            return (8, 0, 11)
+            return (8, 4)
 
     @cached_property
     def test_collations(self):
@@ -104,24 +104,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
                 "update.tests.AdvancedTests.test_update_ordered_by_m2m_annotation_desc",
             },
         }
-        if not self.supports_explain_analyze:
-            skips.update(
-                {
-                    "MariaDB and MySQL >= 8.0.18 specific.": {
-                        "queries.test_explain.ExplainTests.test_mysql_analyze",
-                    },
-                }
-            )
-        if self.connection.mysql_version < (8, 0, 31):
-            skips.update(
-                {
-                    "Nesting of UNIONs at the right-hand side is not supported on "
-                    "MySQL < 8.0.31": {
-                        "queries.test_qs_combinators.QuerySetSetOperationTests."
-                        "test_union_nested"
-                    },
-                }
-            )
         if not self.connection.mysql_is_mariadb:
             skips.update(
                 {
@@ -187,43 +169,15 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         return self.connection.mysql_server_data["sql_auto_is_null"]
 
     @cached_property
-    def supports_column_check_constraints(self):
-        if self.connection.mysql_is_mariadb:
-            return True
-        return self.connection.mysql_version >= (8, 0, 16)
-
-    supports_table_check_constraints = property(
-        operator.attrgetter("supports_column_check_constraints")
-    )
-
-    @cached_property
-    def can_introspect_check_constraints(self):
-        if self.connection.mysql_is_mariadb:
-            return True
-        return self.connection.mysql_version >= (8, 0, 16)
-
-    @cached_property
     def has_select_for_update_of(self):
         return not self.connection.mysql_is_mariadb
 
     @cached_property
-    def supports_explain_analyze(self):
-        return self.connection.mysql_is_mariadb or self.connection.mysql_version >= (
-            8,
-            0,
-            18,
-        )
-
-    @cached_property
     def supported_explain_formats(self):
         # Alias MySQL's TRADITIONAL to TEXT for consistency with other
         # backends.
         formats = {"JSON", "TEXT", "TRADITIONAL"}
-        if not self.connection.mysql_is_mariadb and self.connection.mysql_version >= (
-            8,
-            0,
-            16,
-        ):
+        if not self.connection.mysql_is_mariadb:
             formats.add("TREE")
         return formats
 
@@ -262,25 +216,9 @@ class DatabaseFeatures(BaseDatabaseFeatures):
         return (
             not self.connection.mysql_is_mariadb
             and self._mysql_storage_engine != "MyISAM"
-            and self.connection.mysql_version >= (8, 0, 13)
         )
 
     @cached_property
-    def supports_select_intersection(self):
-        is_mariadb = self.connection.mysql_is_mariadb
-        return is_mariadb or self.connection.mysql_version >= (8, 0, 31)
-
-    supports_select_difference = property(
-        operator.attrgetter("supports_select_intersection")
-    )
-
-    @cached_property
-    def supports_expression_defaults(self):
-        if self.connection.mysql_is_mariadb:
-            return True
-        return self.connection.mysql_version >= (8, 0, 13)
-
-    @cached_property
     def has_native_uuid_field(self):
         is_mariadb = self.connection.mysql_is_mariadb
         return is_mariadb and self.connection.mysql_version >= (10, 7)
diff --git a/django/db/backends/mysql/operations.py b/django/db/backends/mysql/operations.py
index 7dfcd57958..74ba72f316 100644
--- a/django/db/backends/mysql/operations.py
+++ b/django/db/backends/mysql/operations.py
@@ -349,7 +349,7 @@ class DatabaseOperations(BaseDatabaseOperations):
             format = "TREE"
         analyze = options.pop("analyze", False)
         prefix = super().explain_query_prefix(format, **options)
-        if analyze and self.connection.features.supports_explain_analyze:
+        if analyze:
             # MariaDB uses ANALYZE instead of EXPLAIN ANALYZE.
             prefix = (
                 "ANALYZE" if self.connection.mysql_is_mariadb else prefix + " ANALYZE"
@@ -407,15 +407,11 @@ class DatabaseOperations(BaseDatabaseOperations):
     def on_conflict_suffix_sql(self, fields, on_conflict, update_fields, unique_fields):
         if on_conflict == OnConflict.UPDATE:
             conflict_suffix_sql = "ON DUPLICATE KEY UPDATE %(fields)s"
-            # The use of VALUES() is deprecated in MySQL 8.0.20+. Instead, use
-            # aliases for the new row and its columns available in MySQL
-            # 8.0.19+.
+            # The use of VALUES() is not supported in MySQL. Instead, use
+            # aliases for the new row and its columns.
             if not self.connection.mysql_is_mariadb:
-                if self.connection.mysql_version >= (8, 0, 19):
-                    conflict_suffix_sql = f"AS new {conflict_suffix_sql}"
-                    field_sql = "%(field)s = new.%(field)s"
-                else:
-                    field_sql = "%(field)s = VALUES(%(field)s)"
+                conflict_suffix_sql = f"AS new {conflict_suffix_sql}"
+                field_sql = "%(field)s = new.%(field)s"
             # Use VALUE() on MariaDB.
             else:
                 field_sql = "%(field)s = VALUE(%(field)s)"
diff --git a/django/db/backends/mysql/schema.py b/django/db/backends/mysql/schema.py
index ab388754ed..9eba216256 100644
--- a/django/db/backends/mysql/schema.py
+++ b/django/db/backends/mysql/schema.py
@@ -65,13 +65,10 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
         default_is_empty = self.effective_default(field) in ("", b"")
         if default_is_empty and self._is_text_or_blob(field):
             return True
-        if not self._supports_limited_data_type_defaults:
-            return self._is_limited_data_type(field)
         return False
 
     def skip_default_on_alter(self, field):
-        default_is_empty = self.effective_default(field) in ("", b"")
-        if default_is_empty and self._is_text_or_blob(field):
+        if self.skip_default(field):
             return True
         if self._is_limited_data_type(field) and not self.connection.mysql_is_mariadb:
             # MySQL doesn't support defaults for BLOB and TEXT in the
@@ -79,19 +76,8 @@ class DatabaseSchemaEditor(BaseDatabaseSchemaEditor):
             return True
         return False
 
-    @property
-    def _supports_limited_data_type_defaults(self):
-        # MariaDB and MySQL >= 8.0.13 support defaults for BLOB and TEXT.
-        if self.connection.mysql_is_mariadb:
-            return True
-        return self.connection.mysql_version >= (8, 0, 13)
-
     def _column_default_sql(self, field):
-        if (
-            not self.connection.mysql_is_mariadb
-            and self._supports_limited_data_type_defaults
-            and self._is_limited_data_type(field)
-        ):
+        if not self.connection.mysql_is_mariadb and self._is_limited_data_type(field):
             # MySQL supports defaults for BLOB and TEXT columns only if the
             # default value is written as an expression i.e. in parentheses.
             return "(%s)"
diff --git a/docs/ref/contrib/gis/install/index.txt b/docs/ref/contrib/gis/install/index.txt
index f127478151..54c0491c65 100644
--- a/docs/ref/contrib/gis/install/index.txt
+++ b/docs/ref/contrib/gis/install/index.txt
@@ -58,7 +58,7 @@ supported versions, and any notes for each of the supported database backends:
 Database            Library Requirements            Supported Versions  Notes
 ==================  ==============================  ==================  =========================================
 PostgreSQL          GEOS, GDAL, PROJ, PostGIS       15+                 Requires PostGIS.
-MySQL               GEOS, GDAL                      8.0.11+             :ref:`Limited functionality <mysql-spatial-limitations>`.
+MySQL               GEOS, GDAL                      8.4+                :ref:`Limited functionality <mysql-spatial-limitations>`.
 Oracle              GEOS, GDAL                      19+                 XE not supported.
 SQLite              GEOS, GDAL, PROJ, SpatiaLite    3.37.0+             Requires SpatiaLite 4.3+
 ==================  ==============================  ==================  =========================================
diff --git a/docs/ref/databases.txt b/docs/ref/databases.txt
index cd415e1c00..9ea54297aa 100644
--- a/docs/ref/databases.txt
+++ b/docs/ref/databases.txt
@@ -434,7 +434,7 @@ MySQL notes
 Version support
 ---------------
 
-Django supports MySQL 8.0.11 and higher.
+Django supports MySQL 8.4 and higher.
 
 Django's ``inspectdb`` feature uses the ``information_schema`` database, which
 contains detailed data on all database schemas.
diff --git a/docs/ref/models/indexes.txt b/docs/ref/models/indexes.txt
index d2b2430643..6f8dd39fb7 100644
--- a/docs/ref/models/indexes.txt
+++ b/docs/ref/models/indexes.txt
@@ -63,10 +63,9 @@ and the ``weight`` rounded to the nearest integer.
     error. This means that functions such as
     :class:`Concat() <django.db.models.functions.Concat>` aren't accepted.
 
-.. admonition:: MySQL and MariaDB
+.. admonition:: MariaDB
 
-    Functional indexes are ignored with MySQL < 8.0.13 and MariaDB as neither
-    supports them.
+    Functional indexes are unsupported and ignored with MariaDB.
 
 ``fields``
 ----------
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt
index d9badb690d..3e7024211e 100644
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@@ -3161,8 +3161,8 @@ Pass these flags as keyword arguments. For example, when using PostgreSQL:
 
 On some databases, flags may cause the query to be executed which could have
 adverse effects on your database. For example, the ``ANALYZE`` flag supported
-by MariaDB, MySQL 8.0.18+, and PostgreSQL could result in changes to data if
-there are triggers or if a function is called, even for a ``SELECT`` query.
+by MariaDB, MySQL, and PostgreSQL could result in changes to data if there are
+triggers or if a function is called, even for a ``SELECT`` query.
 
 .. _field-lookups:
 
diff --git a/docs/releases/6.1.txt b/docs/releases/6.1.txt
index 1430cb4f17..670026077a 100644
--- a/docs/releases/6.1.txt
+++ b/docs/releases/6.1.txt
@@ -319,6 +319,12 @@ Dropped support for PostgreSQL 14
 Upstream support for PostgreSQL 14 ends in November 2026. Django 6.1 supports
 PostgreSQL 15 and higher.
 
+Dropped support for MySQL < 8.4
+-------------------------------
+
+Upstream support for MySQL 8.0 ends in April 2026, and MySQL 8.1-8.3 are
+short-term innovation releases. Django 6.1 supports MySQL 8.4 and higher.
+
 Miscellaneous
 -------------
 
diff --git a/tests/backends/mysql/tests.py b/tests/backends/mysql/tests.py
index e718f9fae4..15228d254f 100644
--- a/tests/backends/mysql/tests.py
+++ b/tests/backends/mysql/tests.py
@@ -109,8 +109,8 @@ class Tests(TestCase):
             mocked_get_database_version.return_value = (10, 5)
             msg = "MariaDB 10.6 or later is required (found 10.5)."
         else:
-            mocked_get_database_version.return_value = (8, 0, 4)
-            msg = "MySQL 8.0.11 or later is required (found 8.0.4)."
+            mocked_get_database_version.return_value = (8, 0, 31)
+            msg = "MySQL 8.4 or later is required (found 8.0.31)."
 
         with self.assertRaisesMessage(NotSupportedError, msg):
             connection.check_database_version_supported()
diff --git a/tests/queries/test_explain.py b/tests/queries/test_explain.py
index 95ca913cfc..59bd0e8d08 100644
--- a/tests/queries/test_explain.py
+++ b/tests/queries/test_explain.py
@@ -159,9 +159,7 @@ class ExplainTests(TestCase):
         self.assertEqual(len(captured_queries), 1)
         self.assertIn("FORMAT=TRADITIONAL", captured_queries[0]["sql"])
 
-    @unittest.skipUnless(
-        connection.vendor == "mysql", "MariaDB and MySQL >= 8.0.18 specific."
-    )
+    @unittest.skipUnless(connection.vendor == "mysql", "MySQL specific")
     def test_mysql_analyze(self):
         qs = Tag.objects.filter(name="test")
         with CaptureQueriesContext(connection) as captured_queries: