Remove repeated logic causing duplication like COLLATE statements

lib/active_record/connection_adapters/mysql2rgeo/schema_creation.rb

@@ -7,36 +7,13 @@ class SchemaCreation < MySQL::SchemaCreation # :nodoc:
         private
 
           def add_column_options!(sql, options)
-            # By default, TIMESTAMP columns are NOT NULL, cannot contain NULL values,
-            # and assigning NULL assigns the current timestamp. To permit a TIMESTAMP
-            # column to contain NULL, explicitly declare it with the NULL attribute.
-            # See https://dev.mysql.com/doc/refman/en/timestamp-initialization.html
-            if /\Atimestamp\b/.match?(options[:column].sql_type) && !options[:primary_key]
-              sql << " NULL" unless options[:null] == false || options_include_default?(options)
-            end
-
             if options[:srid]
               sql << " /*!80003 SRID #{options[:srid]} */"
             end
 
-            if charset = options[:charset]
-              sql << " CHARACTER SET #{charset}"
-            end
-
-            if collation = options[:collation]
-              sql << " COLLATE #{collation}"
-            end
-
-            if as = options[:as]
-              sql << " AS (#{as})"
-              if options[:stored]
-                sql << (mariadb? ? " PERSISTENT" : " STORED")
-              end
-            end
-
-            add_sql_comment!(super, options[:comment])
+            super
           end
       end
     end
   end
-end
+end