[9.0] Avoid reading unnecessary dimension values when downsampling (#124451) #124470
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…#124451) Read dimension values once per tsid/bucket docid range instead of for each document being processed. The dimension value within a bucket-interval docid range is always to same and this avoids unnecessary reads. Latency of downsampling the tsdb track index into a 1 hour interval downsample index drop by ~16% (running on my local machine).
martijnvg
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:StorageEngine/Downsampling
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Backports the following commits to 9.0: