SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function dateDiff (children 1)
     ExpressionList (children 3)
      Literal \'millisecond\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'2021-01-01\'
        Literal \'Date\'
      Function CAST (children 1)
       ExpressionList (children 2)
        Literal \'2021-01-02 00:01:01\'
        Literal \'DateTime\'
