If limit clause follow from clause directly than the statement
parser of hsqldb parses "LIMIT" token like a table alias and
that's why the next number is unexpected.
The problem was that the limit token was not added to a "keyword"
vector in which parser search while working with form clause.
If the algorithm find a keyword after table names than it
knows it is the end of the form clause. That's why it
worked with any other keywords like "ORDER_BY",
"WHERE", "GROUP BY" and so on.

Change-Id: Iacd3ea3493c85eb0f2579aaad6903537ac65d25a