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Filip Petkovski 583f3e587c Optimize histogram iterators (#13340) ... Optimize histogram iterators Histogram iterators allocate new objects in the AtHistogram and AtFloatHistogram methods, which makes calculating rates over long ranges expensive. In #13215 we allowed an existing object to be reused when converting an integer histogram to a float histogram. This commit follows the same idea and allows injecting an existing object in the AtHistogram and AtFloatHistogram methods. When the injected value is nil, iterators allocate new histograms, otherwise they populate and return the injected object. The commit also adds a CopyTo method to Histogram and FloatHistogram which is used in the BufferedIterator to overwrite items in the ring instead of making new copies. Note that a specialized HPoint pool is needed for all of this to work (`matrixSelectorHPool`). --------- Signed-off-by: Filip Petkovski <filip.petkovsky@gmail.com> Co-authored-by: George Krajcsovits <krajorama@users.noreply.github.com>		2 years ago
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float_histogram.go	Optimize histogram iterators (#13340)	2 years ago
float_histogram_test.go	Optimize histogram iterators (#13340)	2 years ago
generic.go	Reuse slices in [Float]Histogram.ReduceResolution	2 years ago
generic_test.go	fix slice copy in 1.20 (#13389)	2 years ago
histogram.go	Optimize histogram iterators (#13340)	2 years ago
histogram_test.go	Optimize histogram iterators (#13340)	2 years ago
test_utils.go	Move histogram validation code to model/histogram	2 years ago