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when estimated rowCount is 0, adjust to 1 (#18174)

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minghong
2023-03-29 19:03:53 +08:00
committed by GitHub
parent b92087dee8
commit f24174ebf1
1 changed files with 2 additions and 4 deletions
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6
fe/fe-core/src/main/java/org/apache/doris/nereids/stats/FilterEstimation.java
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@ -319,10 +319,8 @@ public class FilterEstimation extends ExpressionVisitor<Statistics, EstimationCo
@Override
public Statistics visitNot(Not not, EstimationContext context) {
Statistics childStats = new FilterEstimation().estimate(not.child(), context.statistics);
double rowCount = Math.max(context.statistics.getRowCount() - childStats.getRowCount(), 0);
if (rowCount == 0.0) {
return Statistics.zero(context.statistics);
}
//if estimated rowCount is 0, adjust to 1 to make upper join reorder reasonable.
double rowCount = Math.max(context.statistics.getRowCount() - childStats.getRowCount(), 1);
StatisticsBuilder statisticsBuilder = new StatisticsBuilder(context.statistics).setRowCount(rowCount);
for (Entry<Expression, ColumnStatistic> entry : context.statistics.columnStatistics().entrySet()) {
Expression expr = entry.getKey();