LiaCastaneda commented on code in PR #24162:
URL: https://github.com/apache/datafusion/pull/24162#discussion_r3751337251
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datafusion/expr/src/higher_order_function.rs:
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@@ -257,26 +270,49 @@ pub struct LambdaArgument {
}
impl LambdaArgument {
+ /// Build a [`LambdaArgument`] for a lambda whose body references the
+ /// subset of `params` named in `used_params`.
+ ///
+ /// [`Self::evaluate`] only materialises the closures whose parameter name
+ /// appears in `used_params`, preserving the original declaration order of
+ /// `params`. Unused declared parameters therefore leave no slot in the
+ /// merged batch, so the body's compressed column indices line up directly
+ /// with the columns the evaluator built.
+ ///
+ /// Callers with a `LambdaExpr` in hand should pass `lambda.used_params()`;
+ /// that method already computes the exact set required here (with
+ /// nested-lambda shadow tracking).
Review Comment:
I don't even think we need doc for this function, the function itself is
very self-explanatory (and also [it will probably never be used
](https://github.com/apache/datafusion/pull/22853#discussion_r3527236493)outside
datafusion)
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