Fix which path is taken in Enumerable.Select for empty partition #88425
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My recent changes to improve perf of some LINQ iterators by implementing `IList<T>` caused Select on an empty partition to start preferring a path that wasn't optimized for empty. This fixes it. I searched and don't see any other operators that would be similarly negatively affected.
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Tagging subscribers to this area: @dotnet/area-system-linq Issue DetailsMy recent changes to improve perf of some LINQ iterators by implementing Fixes the one related benchmark from #88376 (EmptyTakeSelectToArray). None of the other benchmarks there are related to my previous change.
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Jul 5, 2023
src/libraries/System.Linq/src/System/Linq/Enumerable.SizeOpt.cs
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eiriktsarpalis
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Jul 5, 2023
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My recent changes to improve perf of some LINQ iterators by implementing
IList<T>caused Select on an empty partition to start preferring a path that wasn't optimized for empty. This fixes it. I searched and don't see any other operators that would be similarly negatively affected.Fixes the one related benchmark from #88376 (EmptyTakeSelectToArray). None of the other benchmarks there are related to my previous change.