SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dateDiff (children 1)
     ExpressionList (children 3)
      Literal \'second\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'1969-12-31 23:59:59.123\'
        Literal \'DateTime64(6, \\\'UTC\\\')\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'1970-01-01 00:00:09.123\'
        Literal \'DateTime64(6, \\\'UTC\\\')\'
