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[Enhancement] Estimate cardinality of multiple equivalent predicates using multi-column combined stats #56836
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stephen-shelby
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Mar 24, 2025
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[Enhancement] Estimate cardinality of multiple equivalent predicates using multi-column combined stats #56836
stephen-shelby
merged 1 commit into
StarRocks:main
from
stephen-shelby:estimate_multi_eq_pred_with_mcstats
Mar 24, 2025
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...core/src/main/java/com/starrocks/sql/optimizer/statistics/PredicateStatisticsCalculator.java
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…using multi-column combined stats Signed-off-by: stephen <[email protected]>
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[Java-Extensions Incremental Coverage Report]✅ pass : 0 / 0 (0%) |
[FE Incremental Coverage Report]✅ pass : 112 / 114 (98.25%) file detail
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[BE Incremental Coverage Report]✅ pass : 0 / 0 (0%) |
Seaven
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kangkaisen
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Why I'm doing:
What I'm doing:
major changes:
without multi-columns stats
Sel(p1 ∧ p2 ∧ p3) = Sel(p1) × Sel(p2)^{1/2} × Sel(p3)^{1/4}
Multi-column combined statistics based:
S_mc = max(min(1/NDV, min_sel), prod_sel)
Where:
1/NDV is the selectivity based on multi-columns ndv
min_sel is the minimum selectivity among correlated columns
prod_sel is the product of individual column selectivities
added session variable:
cbo_use_correlated_predicate_estimate
if use decreasing formula for CE. default value is true.
Fixes #issue
#56358
What type of PR is this:
Does this PR entail a change in behavior?
If yes, please specify the type of change:
Checklist:
Bugfix cherry-pick branch check: