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In general, the bug occurs when a recursive grammar rule includes an exit condition that does not validate it is used inside a recursive call - thus, it can exit at any time, and not only during a recursion, when faced with the exit condition.
Specifically in hql.g, "queryRule" is defined to return (exit) if it sees CLOSE ')' or 'UNION'. These symbols are not a legitimate "exit condition" if there is no recursion currently happening, as mentioned above.
A possible simple solution (albeit not an elegant one), would be to modify the hql.g grammar file to include the following new definition of subQueryRule:
subQueryRule
: selectFrom
(whereClause)?
(groupByClause)?
(orderByClause)?
;
And then modifying the definition of union as follows:
union
: subQueryRule (UNION subQueryRule)*
;