unit test TestDataForTableStatsField fails

[SunRunAway]

infoschema_reader_test.go:testInfoschemaTableSuite.TestDataForTableStatsField

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

[2020-03-09T06:13:08.055Z] FAIL: infoschema_reader_test.go:211: testInfoschemaTableSuite.TestDataForTableStatsField

[2020-03-09T06:13:08.055Z] 

[2020-03-09T06:13:08.055Z] infoschema_reader_test.go:257:

[2020-03-09T06:13:08.055Z]     tk.MustQuery("select table_rows, avg_row_length, data_length, index_length from information_schema.tables where table_name='t'").Check(

[2020-03-09T06:13:08.055Z]         testkit.Rows("3 18 54 6"))

[2020-03-09T06:13:08.055Z] /home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/util/testkit/testkit.go:62:

[2020-03-09T06:13:08.056Z]     res.c.Assert(resBuff.String(), check.Equals, needBuff.String(), res.comment)

[2020-03-09T06:13:08.056Z] ... obtained string = "[0 0 0 0]\n"

[2020-03-09T06:13:08.056Z] ... expected string = "[3 18 54 6]\n"

[2020-03-09T06:13:08.056Z] ... sql:select table_rows, avg_row_length, data_length, index_length from information_schema.tables where table_name='t', args:[]

It's introduced in #15208

2. What did you expect to see?

3. What did you see instead?

4. What version of TiDB are you using (tidb-server -V or run select tidb_version(); on TiDB)?

Seen at https://internal.pingcap.net/idc-jenkins/blue/organizations/jenkins/tidb_ghpr_unit_test/detail/tidb_ghpr_unit_test/26675/pipeline
in PR #15098 (comment)

[SunRunAway]

@lonng PTAL

[SunRunAway]

It still happens.
Seen at https://internal.pingcap.net/idc-jenkins/blue/organizations/jenkins/tidb_ghpr_unit_test/detail/tidb_ghpr_unit_test/26885/pipeline in #15251 (comment)

@reafans PTAL