SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function hmac (children 1)
     ExpressionList (children 3)
      Literal \'sha256\'
      Function toString (children 1)
       ExpressionList (children 1)
        Identifier number
      Literal \'key\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.numbers
   Literal UInt64_100000
 Identifier Null
