feat(rust): LazyFrame._with_fast_projection()

[eitsupi]

From pola-rs/r-polars#439

Add the function that changes fast_projection because it didn't seem to exist.
(Since it is not added to Python here, please add it to Python if necessary.)

[ritchie46]

This is more something for the optimizer, not really meant to be exposed.

[eitsupi]

Thanks for your reply.
But it seems strange that there is no function to change just one member of OptState.

polars/crates/polars-plan/src/frame/opt_state.rs

Lines 3 to 17 in 90d3694

	pub struct OptState {
	pub projection_pushdown: bool,
	pub predicate_pushdown: bool,
	pub type_coercion: bool,
	pub simplify_expr: bool,
	pub file_caching: bool,
	pub slice_pushdown: bool,
	#[cfg(feature = "cse")]
	pub comm_subplan_elim: bool,
	#[cfg(feature = "cse")]
	pub comm_subexpr_elim: bool,
	pub streaming: bool,
	pub eager: bool,
	pub fast_projection: bool,
	}

[stinodego]

Closing this as Ritchie has remarked this property should not be set directly.