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kxiao pushed a commit to branch branch-2.0
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commit 0456342faadadd5cd038472d2c479040af14947f
Author: minghong <engle...@gmail.com>
AuthorDate: Fri Jul 14 11:30:25 2023 +0800
[improve](nereids)inner join estimation: assume children output at least
one tuple #21792
this assumption is good to eliminate error propagation, when the filter
estimation is too low, less than one.
---
.../src/main/java/org/apache/doris/nereids/stats/JoinEstimation.java | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git
a/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/JoinEstimation.java
b/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/JoinEstimation.java
index 228b6936a7..867ad1527c 100644
---
a/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/JoinEstimation.java
+++
b/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/JoinEstimation.java
@@ -124,7 +124,7 @@ public class JoinEstimation {
Statistics innerJoinStats;
Statistics crossJoinStats = new StatisticsBuilder()
- .setRowCount(Math.max(1, leftStats.getRowCount() *
rightStats.getRowCount()))
+ .setRowCount(Math.max(1, leftStats.getRowCount()) *
Math.max(1, rightStats.getRowCount()))
.putColumnStatistics(leftStats.columnStatistics())
.putColumnStatistics(rightStats.columnStatistics())
.build();
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