From bdf7d2779a207cbd4e6507fe5a275385e2c9df7a Mon Sep 17 00:00:00 2001
From: minghong <minghong.zhou@163.com>
Date: Mon, 14 Nov 2022 16:27:55 +0800
Subject: [PATCH] [fix](Nereids) aggregate always report has 1 row count
 (#14236)

the data structure of new stats is changed, bug Agg-estimation is not changed
---
 .../java/org/apache/doris/nereids/stats/StatsCalculatorV2.java   | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculatorV2.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculatorV2.java
index 005e5963da..a3b97c01e3 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculatorV2.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/stats/StatsCalculatorV2.java
@@ -331,6 +331,7 @@ public class StatsCalculatorV2 extends DefaultPlanVisitor<StatsDeriveResult, Voi
         StatsDeriveResult childStats = groupExpression.childStatistics(0);
         Map<Id, ColumnStatistic> childSlotToColumnStats = childStats.getSlotIdToColumnStats();
         double resultSetCount = groupByExpressions.stream().flatMap(expr -> expr.getInputSlots().stream())
+                .map(Slot::getExprId)
                 .filter(childSlotToColumnStats::containsKey).map(childSlotToColumnStats::get).map(s -> s.ndv)
                 .reduce(1d, (a, b) -> a * b);
         if (resultSetCount <= 0) {