docs: function pg_table_exists(self, name) {
  	return do_query(self, 'SELECT * FROM information_schema.tables WHERE table_name = $1 LIMIT 1', [name]).then(function(rows) {
  		if(!rows) { throw new TypeError("Unexpected result from query: " + util.inspect(rows)); }
  		return rows.length !== 0;
  	});
  }