Kikyou1997 commented on code in PR #17790:
URL: https://github.com/apache/doris/pull/17790#discussion_r1136989717
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fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculator.java:
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@@ -436,12 +437,44 @@ private Statistics computeAggregate(Aggregate<? extends
Plan> aggregate) {
// TODO: since we have no column stats here. just use a fix ratio to
compute the row count.
List<Expression> groupByExpressions =
aggregate.getGroupByExpressions();
Statistics childStats = groupExpression.childStatistics(0);
- Map<Expression, ColumnStatistic> childSlotToColumnStats =
childStats.columnStatistics();
- double resultSetCount = groupByExpressions.stream().flatMap(expr ->
expr.getInputSlots().stream())
-
.filter(childSlotToColumnStats::containsKey).map(childSlotToColumnStats::get).map(s
-> s.ndv)
- .reduce(1d, (a, b) -> a * b);
- if (resultSetCount <= 0) {
- resultSetCount = 1L;
+ double resultSetCount = 1;
+ if (!groupByExpressions.isEmpty()) {
Review Comment:
这一块不必要的分支判断有点多
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