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NATURAL [LEFT/RIGHT] JOIN construction support #1559

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@LonwoLonwo

I'm using JSQLParser 4.3 right now

And it fails on these statements:

SELECT t1.ID,t1.name, t2.DID, t2.name
FROM table1 as t1
NATURAL RIGHT JOIN table2 as t2;
SELECT t1.ID,t1.name, t2.DID, t2.name
FROM table1 as t1
NATURAL LEFT JOIN table2 as t2;

Error:

!STACK 0
net.sf.jsqlparser.parser.ParseException: Encountered unexpected token: "NATURAL" "NATURAL"
    at line 3, column 1.

Was expecting one of:

    ";"
    "CONNECT"
    "EMIT"
    "GROUP"
    "HAVING"
    "PIVOT"
    "START"
    "WINDOW"
    <EOF>

	at net.sf.jsqlparser.parser.CCJSqlParser.generateParseException(CCJSqlParser.java:31234)
	at net.sf.jsqlparser.parser.CCJSqlParser.jj_consume_token(CCJSqlParser.java:31067)
	at net.sf.jsqlparser.parser.CCJSqlParser.Statement(CCJSqlParser.java:163)

As I can see in PostgreSQL documentation:

T1 NATURAL { [INNER] | { LEFT | RIGHT | FULL } [OUTER] } JOIN T2

Natural Join can be used with other keywords between NATURAL and JOIN.

So please add these constructions support.

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