SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function untuple (alias ut) (children 1)
     ExpressionList (children 1)
      Function tuple (children 1)
       ExpressionList (children 4)
        Literal UInt64_1
        Literal UInt64_2
        Literal UInt64_3
        Identifier b
    Function untuple (alias ut2) (children 1)
     ExpressionList (children 1)
      Function tuple (children 1)
       ExpressionList (children 4)
        Literal NULL
        Literal UInt64_3
        Literal UInt64_2
        Identifier a
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Literal UInt64_1 (alias a)
           Literal NULL (alias b)
 Identifier TSVWithNames