`br_incremental_index` test fails with "Column count doesn't match value count at row 1" in CI

[overvenus]

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

[2020-08-10T10:43:03.508Z] [2020/08/10 18:42:48.587 +08:00] [ERROR] [conn.go:744] ["command dispatched failed"] [conn=111] [connInfo="id:111, addr:127.0.0.1:49506 status:10, collation:utf8_general_ci, user:root"] [command=Query] [status="inTxn:0, autocommit:1"] [sql="INSERT INTO br_incremental_index.usertable VALUES (1, 1)"] [txn_mode=PESSIMISTIC] [err="[planner:1136]Column count doesn't match value count at row 1\ngithub.com/pingcap/errors.AddStack\n\t/home/jenkins/agent/workspace/tidb_master/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20200729012136-4e113ddee29e/errors.go:174\ngithub.com/pingcap/parser/terror.(*Error).GenWithStackByArgs\n\t/home/jenkins/agent/workspace/tidb_master/go/pkg/mod/github.com/pingcap/parser@v0.0.0-20200731033026-84f62115187c/terror/terror.go:255\ngithub.com/pingcap/tidb/planner/core.(*PlanBuilder).buildValuesListOfInsert\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/planner/core/planbuilder.go:2394\ngithub.com/pingcap/tidb/planner/core.(*PlanBuilder).buildInsert\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/planner/core/planbuilder.go:2209\ngithub.com/pingcap/tidb/planner/core.(*PlanBuilder).Build\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/planner/core/planbuilder.go:568\ngithub.com/pingcap/tidb/planner.optimize\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/planner/optimize.go:210\ngithub.com/pingcap/tidb/planner.Optimize\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/planner/optimize.go:115\ngithub.com/pingcap/tidb/executor.(*Compiler).Compile\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/executor/compiler.go:62\ngithub.com/pingcap/tidb/session.(*session).ExecuteStmt\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/session/session.go:1139\ngithub.com/pingcap/tidb/server.(*TiDBContext).ExecuteStmt\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/server/driver_tidb.go:198\ngithub.com/pingcap/tidb/server.(*clientConn).handleStmt\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/server/conn.go:1428\ngithub.com/pingcap/tidb/server.(*clientConn).handleQuery\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/server/conn.go:1321\ngithub.com/pingcap/tidb/server.(*clientConn).dispatch\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/server/conn.go:920\ngithub.com/pingcap/tidb/server.(*clientConn).Run\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/server/conn.go:727\ngithub.com/pingcap/tidb/server.(*Server).onConn\n\t/home/jenkins/agent/workspace/tidb_master/go/src/github.com/pingcap/tidb/server/server.go:418\nruntime.goexit\n\t/usr/local/go/src/runtime/asm_amd64.s:1357"]

br.log
tidb.log

https://internal.pingcap.net/idc-jenkins/blue/organizations/jenkins/br_ghpr_unit_and_integration_test/detail/br_ghpr_unit_and_integration_test/2562/pipeline

4. What version of BR and TiDB/TiKV/PD are you using?

All in master branch.