SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 6)
   ExpressionList (children 3)
    Function toStartOfMinute (alias dt_m) (children 1)
     ExpressionList (children 1)
      Identifier datetime
    Function divide (children 1)
     ExpressionList (children 2)
      Function countIf (children 1)
       ExpressionList (children 1)
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier first_time
          Literal UInt64_0
      Function count (children 1)
       ExpressionList
    Function avg (children 1)
     ExpressionList (children 1)
      Function divide (children 1)
       ExpressionList (children 2)
        Function multiply (children 1)
         ExpressionList (children 2)
          Identifier kbytes
          Literal UInt64_8
        Identifier duration
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier projection_test
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier domain_alias
     Literal UInt64_1
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier domain
     Literal \'1\'
   ExpressionList (children 1)
    Identifier dt_m
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier dt_m