update

Signed-off-by: Weizhen Wang <wangweizhen@pingcap.com>

statistics/cmsketch_bench_test.go

@@ -139,7 +139,7 @@ func benchmarkMergeGlobalStatsTopNByConcurrencyWithHists(partitions int, b *test
 }
 
 var benchmarkSizes = []int{100, 1000, 10000, 100000, 1000000, 10000000}
-var benchmarkConcurrencySizes = []int{100, 1000, 10000}
+var benchmarkConcurrencySizes = []int{100, 1000, 10000, 100000, 1000000, 10000000, 100000000}
 
 func BenchmarkMergePartTopN2GlobalTopNWithHists(b *testing.B) {
 	for _, size := range benchmarkSizes {