makeRow = function makeRow(row) {
	        return "| ".concat(row.map(function (column) {
	          var columnAsString = String(column);
	          return columnAsString.length > 9 ? columnAsString.substring(0, 6) + "..." : columnAsString + Array(10 - columnAsString.length).join(" ");
	        }).join(" | "), " |");
	      }
Display the DataFrame as String Table. Can only return a sring instead of displaying the DataFrame.
@param {Number} [rows=10] The number of lines to display.
@param {Boolean} [quiet=false] Quiet mode. If true, only returns a string instead of console.log().
@returns {String} The DataFrame as String Table.
@example
df.show()
df.show(10)
const stringDF = df.show(10, true)