class ActiveRecord::Migration::Compatibility::V5_1

def change_column(table_name, column_name, type, **options)
  if connection.adapter_name == "PostgreSQL"
    super(table_name, column_name, type, **options.except(:default, :null, :comment))
    connection.change_column_default(table_name, column_name, options[:default]) if options.key?(:default)
    connection.change_column_null(table_name, column_name, options[:null], options[:default]) if options.key?(:null)
    connection.change_column_comment(table_name, column_name, options[:comment]) if options.key?(:comment)
  else
    super
  end
end

def create_table(table_name, **options)
  if connection.adapter_name == "Mysql2"
    super(table_name, options: "ENGINE=InnoDB", **options)
  else
    super
  end
end