SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function extractAllGroupsVertical (children 1)
     ExpressionList (children 2)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'hello world\'
        Literal \'FixedString(12)\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'(\\\\w+)\'
        Literal \'FixedString(5)\'