flaky test TestShowPlacementPrivilege

[hawkingrei]

Bug Report

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1. Minimal reproduce step (Required)

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

3. What did you see instead (Required)

         	Error Trace:	pkg/testkit/result.go:49
        	            				pkg/executor/show_placement_test.go:175
        	Error:      	Not equal: 
        	            	expected: "[POLICY p1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" NULL]\n[DATABASE db2 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n[TABLE test.t1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n[TABLE test.t3 PARTITION p1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n[TABLE db2.t1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n"
        	            	actual  : "[POLICY p1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" NULL]\n[DATABASE db2 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n[TABLE db2.t1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n[TABLE test.t1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n[TABLE test.t3 PARTITION p1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" PENDING]\n"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -2,5 +2,5 @@
        	            	 [DATABASE db2 PRIMARY_REGION="cn-east-1" REGIONS="cn-east-1,cn-east-2" SCHEDULE="EVEN" PENDING]
        	            	+[TABLE db2.t1 PRIMARY_REGION="cn-east-1" REGIONS="cn-east-1,cn-east-2" SCHEDULE="EVEN" PENDING]
        	            	 [TABLE test.t1 PRIMARY_REGION="cn-east-1" REGIONS="cn-east-1,cn-east-2" SCHEDULE="EVEN" PENDING]
        	            	 [TABLE test.t3 PARTITION p1 PRIMARY_REGION="cn-east-1" REGIONS="cn-east-1,cn-east-2" SCHEDULE="EVEN" PENDING]
        	            	-[TABLE db2.t1 PRIMARY_REGION="cn-east-1" REGIONS="cn-east-1,cn-east-2" SCHEDULE="EVEN" PENDING]
        	            	 
        	Test:       	TestShowPlacementPrivilege
        	Messages:   	sql:show placement, args:[] 

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/54514/fast_test_tiprow/1838866841766727680#1:build-log.txt%3A16303

4. What is your TiDB version? (Required)