Add a unit test to reproduce count threshold bucket behavior - #88
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Add TestCountThresholdSameBucket_ZD2354669 to verify DDSketch's approximate count behavior when querying for threshold values. The test demonstrates that: - When value 1033 is inserted into the sketch, it maps to a bucket with range approximately [1030.34, 1046.56) - Querying count for any value in [1031-1046] returns countEq=1 because all these values map to the same bucket - Querying count for 1030 and 1047 returns countEq=0 because they map to different buckets This confirms that DDSketch provides approximate counts with ~1.56% relative accuracy, not exact counts for specific values. See more details about DDSketch in [the VLDB paper](http://arxiv.org/pdf/1908.10693).
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What does this PR do?
Add TestCountThresholdSameBucket_ZD2354669 to verify DDSketch's approximate count behavior when querying for threshold values.
The test demonstrates that:
This confirms that DDSketch provides approximate counts with ~1.56% relative accuracy, not exact counts for specific values.
Motivation
Explain a user support ticket.
Additional Notes
See more details about DDSketch in the VLDB paper.