Unstable test github.com/pingcap/tidb/statistics.TestUpdateHistogram

[jyz0309]

Bug Report

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1. Minimal reproduce step (Required)

--- FAIL: TestUpdateHistogram (0.00s)

[2021-10-11T05:26:42.385Z] panic: runtime error: index out of range [3] with length 3 [recovered]

[2021-10-11T05:26:42.385Z] 	panic: runtime error: index out of range [3] with length 3

[2021-10-11T05:26:42.385Z] 

[2021-10-11T05:26:42.385Z] goroutine 309 [running]:

[2021-10-11T05:26:42.385Z] testing.tRunner.func1.2(0x3a0b560, 0xc008fa8000)

[2021-10-11T05:26:42.385Z] 	/usr/local/go/src/testing/testing.go:1143 +0x332

[2021-10-11T05:26:42.385Z] testing.tRunner.func1(0xc000e84780)

[2021-10-11T05:26:42.385Z] 	/usr/local/go/src/testing/testing.go:1146 +0x4b6

[2021-10-11T05:26:42.385Z] panic(0x3a0b560, 0xc008fa8000)

[2021-10-11T05:26:42.385Z] 	/usr/local/go/src/runtime/panic.go:965 +0x1b9

[2021-10-11T05:26:42.385Z] github.com/pingcap/tidb/statistics.mergeBuckets(0xc00a494340, 0x6, 0xa, 0xc008f00040, 0x6, 0x10, 0x40c3a28000000000, 0x10, 0x2745, 0x1)

[2021-10-11T05:26:42.385Z] 	/home/jenkins/agent/workspace/tidb_ghpr_check_2/go/src/github.com/pingcap/tidb/statistics/feedback.go:707 +0x5e9

[2021-10-11T05:26:42.385Z] github.com/pingcap/tidb/statistics.UpdateHistogram(0xc003196af0, 0xc0029cfb80, 0x2, 0xc0075d8a00)

[2021-10-11T05:26:42.385Z] 	/home/jenkins/agent/workspace/tidb_ghpr_check_2/go/src/github.com/pingcap/tidb/statistics/feedback.go:770 +0x109

[2021-10-11T05:26:42.385Z] github.com/pingcap/tidb/statistics.TestUpdateHistogram(0xc000e84780)

[2021-10-11T05:26:42.385Z] 	/home/jenkins/agent/workspace/tidb_ghpr_check_2/go/src/github.com/pingcap/tidb/statistics/feedback_test.go:82 +0xe98

[2021-10-11T05:26:42.385Z] testing.tRunner(0xc000e84780, 0x3d1dca0)

[2021-10-11T05:26:42.385Z] 	/usr/local/go/src/testing/testing.go:1193 +0xef

[2021-10-11T05:26:42.385Z] created by testing.(*T).Run

[2021-10-11T05:26:42.385Z] 	/usr/local/go/src/testing/testing.go:1238 +0x2b3

https://ci.pingcap.net/blue/organizations/jenkins/tidb_ghpr_check_2/detail/tidb_ghpr_check_2/37559/pipeline

2. What did you expect to see? (Required)

Pass the test.

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

master

[jyz0309]

/assign

[tisonkun]

Duplicate of #28676

[github-actions]

Please check whether the issue should be labeled with 'affects-x.y' or 'fixes-x.y.z', and then remove 'needs-more-info' label.