Describe the bug
A clear and concise description of what the bug is.

These queries should parse successfully in JSqlParser (these queries work for both Oracle and Postgres. Not sure what other languages):

SELECT * FROM (SELECT 1 AS id) t GROUP BY CUBE(id) ORDER BY GROUPING(id);
SELECT * FROM (SELECT 1 AS id) t GROUP BY CUBE(id) HAVING GROUPING(id) = 1;
SELECT * FROM (SELECT 1 AS id) t GROUP BY CUBE(id) HAVING GROUPING(id) = 1 ORDER BY GROUPING(id);

To Reproduce
Steps to reproduce the behavior:

1. Example SQL above
2. Parsing this SQL using JSqlParser with this statements
3. Exception:

Caused by: net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "GROUPING" "GROUPING"
    at line 1, column 61.

Was expecting one of:

    "!"
    "("
    "NOT"

Expected behavior
The query to be parsed successfully.

System

• Database you are using: Postgresql 9.6.x
• Java Version: 11
• JSqlParser version: 3.1