Function polars_plan::utils::expr_to_leaf_column_names

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pub fn expr_to_leaf_column_names(expr: &Expr) -> Vec<Arc<str>>ⓘNotable traits for Vec<u8, A>impl<A> Write for Vec<u8, A>where
    A: Allocator,
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This should gradually replace expr_to_root_column as this will get all names in the tree.