unstable test TestExchangePartitionStates

[jiyfhust]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Run unit test.

go test --tags=intest --run="TestExchangePartitionStates"

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

no error.

3. What did you see instead (Required)

                Test:       	TestExchangePartitionStates
        	Messages:   	sql:insert into t values (1000006,"1000006"), [], error stack [table:1748]Found a row not matching the given partition set
        	            	github.com/pingcap/tidb/table/tables.(*partitionedTable).CheckForExchangePartition
        	            		table/tables/partition.go:1278
        	            	github.com/pingcap/tidb/executor.checkRowForExchangePartition
        	            		executor/write.go:329
        	            	github.com/pingcap/tidb/executor.(*InsertValues).fillRow
        	            		executor/insert_common.go:696
        	            	github.com/pingcap/tidb/executor.(*InsertValues).fastEvalRow
        	            		executor/insert_common.go:411
        	            	github.com/pingcap/tidb/executor.insertRows
        	            		executor/insert_common.go:219
        	            	github.com/pingcap/tidb/executor.(*InsertExec).Next
        	            		executor/insert.go:307
        	            	github.com/pingcap/tidb/executor/internal/exec.Next
        	            		executor/internal/exec/executor.go:283
        	            	github.com/pingcap/tidb/executor.(*ExecStmt).next
        	            		executor/adapter.go:1223
        	            	github.com/pingcap/tidb/executor.(*ExecStmt).handleNoDelayExecutor
        	            		executor/adapter.go:968
        	            	github.com/pingcap/tidb/executor.(*ExecStmt).handlePessimisticDML
        	            		executor/adapter.go:1029
        	            	github.com/pingcap/tidb/executor.(*ExecStmt).handleNoDelay
        	            		executor/adapter.go:791
        	            	github.com/pingcap/tidb/executor.(*ExecStmt).Exec
        	            		executor/adapter.go:575
        	            	github.com/pingcap/tidb/session.runStmt
        	            		session/session.go:2420
        	            	github.com/pingcap/tidb/session.(*session).ExecuteStmt
        	            		session/session.go:2270
        	            	github.com/pingcap/tidb/testkit.(*TestKit).ExecWithContext
        	            		testkit/testkit.go:342
        	            	github.com/pingcap/tidb/testkit.(*TestKit).MustExecWithContext
        	            		testkit/testkit.go:134
        	            	github.com/pingcap/tidb/testkit.(*TestKit).MustExec
        	            		testkit/testkit.go:129
        	            	table/tables/test/partition/partition_test.TestExchangePartitionStates
        	            		table/tables/test/partition/partition_test.go:770
        	            	testing.tRunner
        	            		GOROOT/src/testing/testing.go:1595
        	            	runtime.goexit
        	            		src/runtime/asm_amd64.s:1650

```

### 4. What is your TiDB version? (Required)

<!-- Paste the output of SELECT tidb_version() -->

master

[zimulala]

Find it again: https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Fghpr_unit_test/detail/ghpr_unit_test/32864/pipeline/