Raoul Rodriguez comments

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                                            Raoul Rodriguez

window expression not allowed in aggregation: allow chained `.over()` and `.rolling()` aggregations

@cmdlineluser appreciate the pointer! I may have oversimplified my example. The motivating case I encountered is a dynamic threshold with an `.all()` aggregation. In the spirit on the provided example:...

window expression not allowed in aggregation: allow chained `.over()` and `.rolling()` aggregations

@xyk2000 messaging here to not clutter that other thread I'm not sure if https://github.com/pola-rs/polars/issues/12049 would help this? That's talking about breaking up the rolling api, which is different than allowing...

window expression not allowed in aggregation: allow chained `.over()` and `.rolling()` aggregations

No that is exactly what I wanted! Didn't know about [DataFrame.rolling()](https://pola-rs.github.io/polars/py-polars/html/reference/dataframe/api/polars.DataFrame.rolling.html#polars.DataFrame.rolling). Thank you for pointing me in the right direction. Is this `by=` property available on [Expr.rolling()](https://pola-rs.github.io/polars/py-polars/html/reference/expressions/api/polars.Expr.rolling.html#polars.Expr.rolling)? I ask because...

window expression not allowed in aggregation: allow chained `.over()` and `.rolling()` aggregations

Okay. So the `Expr.rolling()` docs are temporarily incorrect while the new rolling context is developed. Thanks for the context. I do like the `.rolling().over()` syntax. Unsure if that's in scope...