SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function extractGroups (children 1)
     ExpressionList (children 2)
      Literal \'hello world\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'(\\\\w+) (\\\\w+)\'
        Literal \'FixedString(11)\'
