xzj7019 commented on code in PR #24462:
URL: https://github.com/apache/doris/pull/24462#discussion_r1327218295
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fe/fe-core/src/main/java/org/apache/doris/nereids/stats/JoinEstimation.java:
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@@ -137,7 +137,7 @@ private static Statistics estimateHashJoin(Statistics
leftStats, Statistics righ
outputRowCount = outputRowCount * Math.pow(0.9,
unTrustableCondition.size());
} else {
outputRowCount = Math.max(leftStats.getRowCount(),
rightStats.getRowCount());
- Optional<Double> ratio =
unTrustEqualRatio.stream().max(Double::compareTo);
+ Optional<Double> ratio =
unTrustEqualRatio.stream().min(Double::compareTo);
Review Comment:
would better to make a policy for mutiple column ndv estimation based on
reversed order, similar with policy in gby?
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