SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dateDiff (children 1)
     ExpressionList (children 3)
      Literal \'second\'
      Function materialize (children 1)
       ExpressionList (children 1)
        Function toDateTime64 (children 1)
         ExpressionList (children 3)
          Literal \'1927-01-01 00:00:00\'
          Literal UInt64_6
          Literal \'UTC\'
      Function materialize (children 1)
       ExpressionList (children 1)
        Function toDateTime64 (children 1)
         ExpressionList (children 3)
          Literal \'1927-01-01 00:00:10\'
          Literal UInt64_3
          Literal \'UTC\'