Improve performance of aggregate operations on empty dictionaries #7418
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* master: update release note prepare v14.4.0 sets not allowed at storage level inside mixed (#7502) 🔄 Synced file(s) with realm/ci-actions (#7481) RCORE-1982 Opening realm with cached user while offline results in fatal error and session does not retry connection (#7469) RCORE-2008 Bump baas version (#7499) RCORE-2027: Setting log callback should not override existing log level hierarchy (#7494) Derive correct ubuntu version on linuxmint (#7471) Include nested path in 'OutOfBounds' error message (#7489) fix depth for nested collections set to 4 in debug mode (#7486) Set the minimum buffer size in Group::write() to be equal to the page size (#7492) Update the parent's content version when bumping it in a nested collection (#7470) release notes core v14.3.0 (#7482) RCORE-2007 Added Resumption delay configuration to SyncClientTimeouts (#7441) Improve performance of aggregate operations on empty dictionaries (#7418)
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This fixes the one remaining v14 perf regression reported by the object store benchmarks. It ended up being a sort of fake optimization - it makes sum() on empty dictionaries more than twice as fast, but once there's a single object it's only 10% faster and is meaningless for any larger - but IMO it's a net improvement to the code.