class method self.new

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 309
      def initialize(connection, logger, connection_parameters, config)
        super(connection, logger)

        if config.fetch(:prepared_statements) { true }
          @visitor = Arel::Visitors::PostgreSQL.new self
        else
          @visitor = BindSubstitution.new self
        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,
                                        config.fetch(:statement_limit) { 1000 }

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

        @local_tz = execute('SHOW TIME ZONE', 'SCHEMA').first["TimeZone"]
      end