class method self.new

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 552
      def initialize(connection, logger, connection_parameters, config)
        super(connection, logger)

        if self.class.type_cast_config_to_boolean(config.fetch(:prepared_statements) { true })
          @prepared_statements = true
          @visitor = Arel::Visitors::PostgreSQL.new self
        else
          @visitor = unprepared_visitor
        end

        @connection_parameters, @config = connection_parameters, config

        # @local_tz is initialized as nil to avoid warnings when connect tries to use it
        @local_tz = nil
        @table_alias_length = nil

        connect
        @statements = StatementPool.new @connection,
                                        self.class.type_cast_config_to_integer(config.fetch(:statement_limit) { 1000 })

        if postgresql_version < 80200
          raise "Your version of PostgreSQL (#{postgresql_version}) is too old, please upgrade!"
        end

        @type_map = OID::TypeMap.new
        initialize_type_map(type_map)
        @local_tz = execute('SHOW TIME ZONE', 'SCHEMA').first["TimeZone"]
        @use_insert_returning = @config.key?(:insert_returning) ? self.class.type_cast_config_to_boolean(@config[:insert_returning]) : true
      end