diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index 53cc52f200f6f16dd84681a02e4384426a7bb4a8..d435d9110251cb437ec30fec92b91a6943154a39 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -3,6 +3,7 @@
 require 'active_record/connection_adapters/mysql/schema_creation'
 require 'active_record/connection_adapters/mysql/schema_definitions'
 require 'active_record/connection_adapters/mysql/schema_dumper'
+require 'active_record/connection_adapters/mysql/type_metadata'
 
 require 'active_support/core_ext/string/strip'
 
@@ -20,33 +21,6 @@ def schema_creation
         MySQL::SchemaCreation.new(self)
       end
 
-      class MysqlTypeMetadata < DelegateClass(SqlTypeMetadata) # :nodoc:
-        attr_reader :extra, :strict
-
-        def initialize(type_metadata, extra: "", strict: false)
-          super(type_metadata)
-          @type_metadata = type_metadata
-          @extra = extra
-          @strict = strict
-        end
-
-        def ==(other)
-          other.is_a?(MysqlTypeMetadata) &&
-            attributes_for_hash == other.attributes_for_hash
-        end
-        alias eql? ==
-
-        def hash
-          attributes_for_hash.hash
-        end
-
-        protected
-
-        def attributes_for_hash
-          [self.class, @type_metadata, extra, strict]
-        end
-      end
-
       ##
       # :singleton-method:
       # By default, the Mysql2Adapter will consider all columns of type <tt>tinyint(1)</tt>
@@ -804,7 +778,7 @@ def extract_precision(sql_type)
       end
 
       def fetch_type_metadata(sql_type, extra = "")
-        MysqlTypeMetadata.new(super(sql_type), extra: extra, strict: strict_mode?)
+        MySQL::TypeMetadata.new(super(sql_type), extra: extra, strict: strict_mode?)
       end
 
       def add_index_length(option_strings, column_names, options = {})
diff --git a/activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb b/activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb
new file mode 100644
index 0000000000000000000000000000000000000000..e1e3f7b47251e8ca642feb6ab09395259f9196ea
--- /dev/null
+++ b/activerecord/lib/active_record/connection_adapters/mysql/type_metadata.rb
@@ -0,0 +1,32 @@
+module ActiveRecord
+  module ConnectionAdapters
+    module MySQL
+      class TypeMetadata < DelegateClass(SqlTypeMetadata) # :nodoc:
+        attr_reader :extra, :strict
+
+        def initialize(type_metadata, extra: "", strict: false)
+          super(type_metadata)
+          @type_metadata = type_metadata
+          @extra = extra
+          @strict = strict
+        end
+
+        def ==(other)
+          other.is_a?(MySQL::TypeMetadata) &&
+            attributes_for_hash == other.attributes_for_hash
+        end
+        alias eql? ==
+
+        def hash
+          attributes_for_hash.hash
+        end
+
+        protected
+
+        def attributes_for_hash
+          [self.class, @type_metadata, extra, strict]
+        end
+      end
+    end
+  end
+end
diff --git a/activerecord/test/cases/column_definition_test.rb b/activerecord/test/cases/column_definition_test.rb
index dc05aad19e75b7450108f9a52ef5610dad019bd8..81162b7e9853ba994f68248a1624fa0d85579dc1 100644
--- a/activerecord/test/cases/column_definition_test.rb
+++ b/activerecord/test/cases/column_definition_test.rb
@@ -64,7 +64,7 @@ def test_should_not_set_default_for_blob_and_text_data_types
             MySQL::Column.new("title", "a", SqlTypeMetadata.new(sql_type: "blob"))
           end
 
-          text_type = AbstractMysqlAdapter::MysqlTypeMetadata.new(
+          text_type = MySQL::TypeMetadata.new(
             SqlTypeMetadata.new(type: :text))
           assert_raise ArgumentError do
             MySQL::Column.new("title", "Hello", text_type)