XieJiann commented on code in PR #24764:
URL: https://github.com/apache/doris/pull/24764#discussion_r1334280226
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fe/fe-core/src/main/java/org/apache/doris/nereids/stats/FilterEstimation.java:
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@@ -386,6 +387,19 @@ public Statistics visitNot(Not not, EstimationContext
context) {
return statisticsBuilder.build();
}
+ @Override
+ public Statistics visitIsNull(IsNull isNull, EstimationContext context) {
+ ColumnStatistic childStats =
ExpressionEstimation.estimate(isNull.child(), context.statistics);
+ if (childStats.isUnKnown()) {
+ return new StatisticsBuilder(context.statistics).build();
+ }
+ double outputRowCount = context.statistics.getRowCount() -
childStats.numNulls;
+ StatisticsBuilder builder = new StatisticsBuilder(context.statistics);
Review Comment:
isNull output nulls, so the rowCount is childStast.numNulls?
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