Function datafusion_expr::expr_rewriter::rewrite_preserving_name

pub fn rewrite_preserving_name<R>(expr: Expr, rewriter: &mut R) -> Result<Expr>where
    R: TreeNodeRewriter<N = Expr>,

Rewrites expr using rewriter, ensuring that the output has the same name as expr prior to rewrite, adding an alias if necessary.

This is important when optimizing plans to ensure the output schema of plan nodes don’t change after optimization