SelectWithUnionQuery (children 3)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function untuple (alias t) (children 1)
     ExpressionList (children 1)
      Function tuple (children 1)
       ExpressionList (children 1)
        Literal UInt64_1 (alias a)
 Identifier Vertical
 Set
