SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier merge_tree_in_subqueries
   Function in (children 1)
    ExpressionList (children 2)
     Identifier name
     Subquery (children 1)
      SelectWithUnionQuery (children 1)
       ExpressionList (children 1)
        SelectQuery (children 4)
         ExpressionList (children 1)
          Function concat (children 1)
           ExpressionList (children 2)
            Literal \'test\'
            Function toString (children 1)
             ExpressionList (children 1)
              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
