SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function groupArrayLast (children 2)
     ExpressionList (children 1)
      Literal \'x\'
     ExpressionList (children 1)
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'0\'
        Literal \'UInt64\'
