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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>		10 months ago
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chunk_write_queue.go	Fix: getting rid of EncOOOXOR chunk encoding (#12111)	2 years ago
chunk_write_queue_test.go	Fix: getting rid of EncOOOXOR chunk encoding (#12111)	2 years ago
chunks.go	Optimize histogram iterators (#13340)	10 months ago
chunks_test.go	Change `ChunkReader.Chunk()` to `ChunkOrIterable()`	1 year ago
head_chunks.go	tsdb: use Go standard errors	12 months ago
head_chunks_other.go	remove obsolete build tag	11 months ago
head_chunks_test.go	golangci-lint: enable testifylint linter (#13254)	1 year ago
head_chunks_windows.go	Format Go source files using 'gofumpt -w -s -extra'	3 years ago
queue.go	Reduce chunk write queue memory usage 2 (#10874)	2 years ago
queue_test.go	golangci-lint: enable testifylint linter (#13254)	1 year ago
samples.go	Add a chunk size limit in bytes (#12054)	1 year ago