SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function plus (children 1)
     ExpressionList (children 2)
      Literal UInt64_1
      Function max (children 1)
       ExpressionList (children 1)
        Identifier x1
    Identifier x2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test
   ExpressionList (children 2)
    Literal UInt64_1
    Literal UInt64_2