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[opt](nereids)estimate rowcount for is-null filter when column stats are not available (#34519)

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* estimate rowcount for is-null filter when column stats are not available
This commit is contained in:
minghong
2024-05-10 11:20:02 +08:00
committed by yiguolei
parent c742a327e6
commit 9915862bf7
3 changed files with 25 additions and 25 deletions
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6
fe/fe-core/src/main/java/org/apache/doris/nereids/stats/FilterEstimation.java
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@ -64,9 +64,8 @@ public class FilterEstimation extends ExpressionVisitor<Statistics, EstimationCo
public static final double DEFAULT_HAVING_COEFFICIENT = 0.01;
public static final double DEFAULT_EQUALITY_COMPARISON_SELECTIVITY = 0.1;
public static final double DEFAULT_LIKE_COMPARISON_SELECTIVITY = 0.2;
public static final double DEFAULT_ISNULL_SELECTIVITY = 0.001;
public static final double DEFAULT_ISNULL_SELECTIVITY = 0.005;
private Set<Slot> aggSlots;
private boolean isOnBaseTable = false;
@ -421,7 +420,8 @@ public class FilterEstimation extends ExpressionVisitor<Statistics, EstimationCo
public Statistics visitIsNull(IsNull isNull, EstimationContext context) {
ColumnStatistic childColStats = ExpressionEstimation.estimate(isNull.child(), context.statistics);
if (childColStats.isUnKnown()) {
return new StatisticsBuilder(context.statistics).build();
double row = context.statistics.getRowCount() * DEFAULT_ISNULL_SELECTIVITY;
return new StatisticsBuilder(context.statistics).setRowCount(row).build();
}
double outputRowCount = childColStats.numNulls;
if (!isOnBaseTable) {