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Type:
Improvement
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: None
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Query Optimization
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Fully Compatible
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internalQuerySamplingBySequentialScan, which is used exclusively for testing, takes the first N documents from the collection in order to build the sample, with means that the sample is skewed.
Instead, take every M-th document so that you still end up with N documents in the sample, but taken at intervals over the entire collection.
This will undoubtedly introduce a performance hit, but this flag is only used for testing purposes.
- is related to
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SERVER-123925 Join optimization: cardinality estimate for join is off by 10^2 (overestimation)
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- In Code Review
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- related to
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SERVER-127789 Shuffle TPC-H dataset used in tests
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- Closed
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- Closed
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- Closed
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