SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 2)
    Identifier id (alias id2)
    Identifier name (alias value)
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier merge_tree_in_subqueries
   Function in (children 1)
    ExpressionList (children 2)
     Function tuple (children 1)
      ExpressionList (children 2)
       Identifier value
       Identifier id2
     Subquery (children 1)
      SelectWithUnionQuery (children 1)
       ExpressionList (children 1)
        SelectQuery (children 4)
         ExpressionList (children 2)
          Function concat (children 1)
           ExpressionList (children 2)
            Literal \'test\'
            Function toString (children 1)
             ExpressionList (children 1)
              Identifier number
          Identifier number
         TablesInSelectQuery (children 1)
          TablesInSelectQueryElement (children 1)
           TableExpression (children 1)
            TableIdentifier system.numbers
         Literal UInt64_2
         Literal UInt64_3
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier id
