[opt](nereids) refine expression estimation

xzj7019 · Sep 11, 2024 · e9b64c4 · e9b64c4
1 parent e75189d
commit e9b64c4
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/FilterEstimation.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/FilterEstimation.java
@@ -332,7 +332,8 @@ private Statistics estimateEqualTo(ComparisonPredicate cp, ColumnStatistic stats
             } else {
                 double val = statsForRight.maxValue;
                 if (val > statsForLeft.maxValue || val < statsForLeft.minValue) {
-                    selectivity = 0.0;
+                    // do a lower bound protection to avoid using 0 directly
+                    selectivity = RANGE_SELECTIVITY_THRESHOLD;
                 } else if (ndv >= 1.0) {
                     selectivity = StatsMathUtil.minNonNaN(1.0, 1.0 / ndv);
                 } else {