SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function toDateTime (children 1)
     ExpressionList (children 1)
      Identifier timestamp
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tdm2
   Function equals (children 1)
    ExpressionList (children 2)
     Function toHour (children 1)
      ExpressionList (children 1)
       Function toDateTime (children 1)
        ExpressionList (children 1)
         Identifier timestamp
     Literal UInt64_13