class method self.new

# File activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb, line 322
      def initialize(...)
        super

        conn_params = @config.compact

        # Map ActiveRecords param names to PGs.
        conn_params[:user] = conn_params.delete(:username) if conn_params[:username]
        conn_params[:dbname] = conn_params.delete(:database) if conn_params[:database]

        # Forward only valid config params to PG::Connection.connect.
        valid_conn_param_keys = PG::Connection.conndefaults_hash.keys + [:requiressl]
        conn_params.slice!(*valid_conn_param_keys)

        @connection_parameters = conn_params

        @max_identifier_length = nil
        @type_map = nil
        @raw_connection = nil
        @notice_receiver_sql_warnings = []

        @use_insert_returning = @config.key?(:insert_returning) ? self.class.type_cast_config_to_boolean(@config[:insert_returning]) : true
      end