proost opened a new pull request, #129:
URL: https://github.com/apache/datasketches-go/pull/129

   Situation:
   
   We use tuple sketch a lot. One of teams use tuple sektch extremely. One 
application has many tuple sketches, that each one has lots of summaries. 
   
   So It makes a more than billion live objects in heap. So every GC period, 
especially Marking phase, go runtime uses too many CPU usages as well as it 
makes longer stop the world.
   
   So I propose supporting value-type receiver summary using "UpdateFunc".
   
   Normally, it is not that burden to allocate millions ~ less than billions 
live objects in heap. So current interface is ok. Also current interface is 
easy to use and easy to understand. 
   
   Here is benchmark result: 
   
   ``` 
   goos: darwin
   goarch: arm64
   pkg: github.com/apache/datasketches-go/tuple
   cpu: Apple M4 Pro
   BenchmarkUpdateSketch_PointerSummary
   BenchmarkUpdateSketch_PointerSummary-12          3956            301095 
ns/op          318668 B/op       8917 allocs/op
   PASS
   
   
   goos: darwin
   goarch: arm64
   pkg: github.com/apache/datasketches-go/tuple
   cpu: Apple M4 Pro
   BenchmarkUpdateSketch_ValueSummary
   BenchmarkUpdateSketch_ValueSummary-12            5446            213742 
ns/op          280724 B/op          8 allocs/op
   PASS
   
   ``` 
   
   Benchmark code is included in this PR.


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