public static Expression split(Expression expression, String sep) {
        return x("SPLIT(" + expression.toString() + ", \"" + sep + "\")");
    }
public static Expression split ( Expression expression , String sep ) { return x ( "SPLIT(" + expression . toString ( ) + ", \"" + sep + "\")" ) ; }
Returned expression results in a split of the string into an array of substrings separated by sep.