SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function toUInt128 (children 1)
     ExpressionList (children 1)
      Literal UInt64_1
    Function dictGetOrDefault (alias value_second) (children 1)
     ExpressionList (children 4)
      Literal \'direct_dictionary_simple_key_simple_attributes\'
      Literal \'value_second\'
      Identifier number
      Function toString (children 1)
       ExpressionList (children 1)
        Function toFixedString (children 1)
         ExpressionList (children 2)
          Function toFixedString (children 1)
           ExpressionList (children 2)
            Function toFixedString (children 1)
             ExpressionList (children 2)
              Function materialize (children 1)
               ExpressionList (children 1)
                Literal \'default\'
              Literal UInt64_7
            Literal UInt64_7
          Function toUInt128 (children 1)
           ExpressionList (children 1)
            Literal UInt64_7
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_255
 Identifier Null
