timsaucer commented on PR #11550:
URL: https://github.com/apache/datafusion/pull/11550#issuecomment-2245192874
Question: it looks like we have some functions that have both aggregate
functions and window functions defined. Specifically looking at `first_value`
and `last_value`. My thought is that the current PR just keeps with the
existing pattern but I think we should merge these two, right? Should all
aggregate functions be viable window functions?
Right now I have `datafusion_expr::window_function::first_value()` will
return a window function expression of type `BuiltInWindowFunction::FirstValue`
and `datafusion_functions_aggregate::first_last::first_value()` will return an
aggregate expression of type `AggregateUDF` and
`datafusion_functions_aggregate::first_last::FirstValue`.
My thinking is that we should stick with this PR for now but open an issue
to converge all of these. I would expect the following psuedocode to be
equivalent
```
let window_expr = datafusion_expr::window_function::first_value(col("a"));
let agg_expr =
datafusion_functions_aggregate::first_last::first_value(col("a"));
```
Please correct me if I'm missing something here.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
