public static WindowOver<Double> corr(Expression<? extends Number> expr1, Expression<? extends Number> expr2) {
        return new WindowOver<Double>(Double.class, SQLOps.CORR, expr1, expr2);
    }
CORR returns the coefficient of correlation of a set of number pairs.

@param expr1 first arg
@param expr2 second arg
@return corr(expr1, expr2)
querydsl-sql/src/main/java/com/querydsl/sql/SQLExpressions.java