From from = new From();
UnaryFromClause ufc = new UnaryFromClause();
ufc.setGroup(new GroupSymbol("t1")); //$NON-NLS-1$
ufc.setOptional(true);
from.addClause(ufc);
from.addGroup(new GroupSymbol("t2")); //$NON-NLS-1$
query.setFrom(from);
TestParser.helpTest(sql, "SELECT * FROM /*+ optional */ t1, t2", query); //$NON-NLS-1$
}