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Reduce allocation churn in tree rewriting #21751
Description
Is your feature request related to a problem or challenge?
The logical query optimizer does a fair bit of allocation. After profiling, two similar hotspots are in TreeNodeContainer: map_elements takes a closure, unboxes the inner value, invokes the closure, and then re-boxes the value in a fresh Box. It would be more efficient to just reuse the Box. Similarly for the Arc variant, as long as the Arc is unique.
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Activity
neilconway commentedon Apr 20, 2026
take
[-]Reduce allocation churn in the optimizer[/-][+]Reduce allocation churn in tree rewriting[/+]perf: Reduce `Box` and `Arc` allocation churn during tree rewriting (a…