SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function toNullable (alias dt) (children 1)
     ExpressionList (children 1)
      Function toDateTime (children 1)
       ExpressionList (children 1)
        Literal \'2023-04-21 10:20:30\'
    Function toMillisecond (children 1)
     ExpressionList (children 1)
      Identifier dt
