Ritchie Vink comments

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                                            Ritchie Vink

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refactor: Turn `Expr.append` into DSL `Expr::Function(Append)`

We should use the existing `Expr::Function` for this, then we don't have to implement the whole physical expressions. I don't think this operation is worth a dedicated core node.

`from_pandas` incorrectly handles object columns in some cases

Pandas Series are typed and if the type is object we should respect that. We are not inferring object columns. I don't understand why we try to read that column...

Tracking issue for the new streaming engine

> Any insight as to when this will be available with sink_* methods? Next release the sinks will point to the new streaming engine.

Tracking issue for the new streaming engine

> Are there any thoughts of having something, in rust like AnonymousSink (analogous to AnonymousScan) trait or a python generator or io plugin for consuming results in a way other...

docs(python): More accurate and helpful docs for user defined functions

Can you do a rebase?

fix: pass scalar as series to update group information

Thanks for the PR. I will clsoe this as the bug is resolved on main.