SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function toStartOfHour (alias _c1) (children 1)
     ExpressionList (children 1)
      Identifier c1
    Identifier c2
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Function values (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 2)
          Function toDateTime (children 1)
           ExpressionList (children 1)
            Literal \'2020-01-01 01:01:01\'
          Literal UInt64_999
        Function tuple (children 1)
         ExpressionList (children 2)
          Function toDateTime (children 1)
           ExpressionList (children 1)
            Literal \'2020-01-01 01:01:59\'
          Literal UInt64_1
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier _c1
    OrderByElement (children 1)
     Identifier c2
