[opt](nereids) use rowcount to compute runtime filter size if ndv is …

…not available (apache#26022)
dutyu · Nov 4, 2023 · 7c17586 · 7c17586
1 parent 81b9f22
commit 7c17586
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/RuntimeFilterGenerator.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/processor/post/RuntimeFilterGenerator.java
@@ -345,7 +345,8 @@ private long getBuildSideNdv(AbstractPhysicalJoin<? extends Plan, ? extends Plan
         }
         ExpressionEstimation estimator = new ExpressionEstimation();
         ColumnStatistic buildColStats = compare.right().accept(estimator, right.getStats());
-        return buildColStats.isUnKnown ? -1 : Math.max(1, (long) buildColStats.ndv);
+        return buildColStats.isUnKnown
+                ? Math.max(1, (long) right.getStats().getRowCount()) : Math.max(1, (long) buildColStats.ndv);
     }
 
     public static Slot checkTargetChild(Expression leftChild) {