xzj7019 commented on code in PR #29184:
URL: https://github.com/apache/doris/pull/29184#discussion_r1438106549
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/stats/FilterEstimation.java:
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@@ -117,6 +118,11 @@ public Statistics visitCompoundPredicate(CompoundPredicate
predicate, Estimation
colBuilder.setMinValue(union.getLow()).setMinExpr(union.getLowExpr())
.setMaxValue(union.getHigh()).setMaxExpr(union.getHighExpr())
.setNdv(union.getDistinctValues());
+ if (!(leftExpr instanceof IsNull || rightExpr instanceof
IsNull)) {
+ colBuilder.setNumNulls(0);
Review Comment:
use the max numNulls instead.
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