SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function extractAllGroupsVertical (children 1)
     ExpressionList (children 2)
      Literal \'hello world\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'(\\\\w+)\'
        Literal \'FixedString(5)\'
