From d22f9bca98c17adecd6137c903b9bf9e5a25e77f Mon Sep 17 00:00:00 2001
From: Ti Chi Robot <ti-community-prow-bot@tidb.io>
Date: Thu, 10 Aug 2023 10:27:26 +0800
Subject: [PATCH] statistics: remove useless code in the
 MergePartTopN2GlobalTopN (#45755) (#45770)

close pingcap/tidb#45706
---
 statistics/cmsketch.go | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/statistics/cmsketch.go b/statistics/cmsketch.go
index 938cb30aa67e2..9c5c8bfdfa547 100644
--- a/statistics/cmsketch.go
+++ b/statistics/cmsketch.go
@@ -745,15 +745,8 @@ func MergePartTopN2GlobalTopN(loc *time.Location, version int, topNs []*TopN, n
 	}
 
 	partNum := len(topNs)
-	topNsNum := make([]int, partNum)
 	removeVals := make([][]TopNMeta, partNum)
-	for i, topN := range topNs {
-		if topN == nil {
-			topNsNum[i] = 0
-			continue
-		}
-		topNsNum[i] = len(topN.TopN)
-	}
+
 	// Different TopN structures may hold the same value, we have to merge them.
 	counter := make(map[hack.MutableString]float64)
 	// datumMap is used to store the mapping from the string type to datum type.