join A+B => max(A,B)

englefly · Nov 2, 2023 · eb24f51 · eb24f51
1 parent 00eba56
commit eb24f51
Showing 1 changed file with 1 addition and 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
@@ -171,7 +171,7 @@ private static Statistics estimateNestLoopJoin(Statistics leftStats, Statistics
 
     private static Statistics estimateInnerJoin(Statistics leftStats, Statistics rightStats, Join join) {
         if (hashJoinConditionContainsUnknownColumnStats(leftStats, rightStats, join)) {
-            double rowCount = leftStats.getRowCount() + rightStats.getRowCount();
+            double rowCount = Math.max(leftStats.getRowCount(), rightStats.getRowCount());
             rowCount = Math.max(1, rowCount);
             return new StatisticsBuilder()
                 .setRowCount(rowCount)