[X-3344] Backport optimization to 58.3 branch - #2
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This allows optimizations since iterators uphold invariants.
Revert this when MSRV is bumped to at least 1.93.
MassivePizza
marked this pull request as ready for review
July 27, 2026 13:00
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Which issue does this PR close?
N/A
Rationale for this change
Early merge of substantial performance improvements.
What changes are included in this PR?
Cherry-picked from:
apache#10345
apache#10364
apache#10412
Done as a single branch here, but can be split up if requested.
Are there any user-facing changes?