public static WindowOver<Double> percentRank() {
        return percentRank;
    }
As an analytic function, for a row r, PERCENT_RANK calculates the rank of r minus 1, divided by
1 less than the number of rows being evaluated (the entire query result set or a partition).

@return percent_rank()
querydsl-sql/src/main/java/com/querydsl/sql/SQLExpressions.java