flaky test TestShowPlacement

[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)

    result.go:49: 
        	Error Trace:	pkg/testkit/result.go:49
        	            				pkg/executor/show_placement_test.go:90
        	Error:      	Not equal: 
        	            	expected: "[POLICY pa1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" NULL]\n[POLICY pa2 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" NULL]\n[POLICY pb1 CONSTRAINTS=\"[+disk=ssd]\" VOTERS=5 VOTER_CONSTRAINTS=\"[+region=bj]\" LEARNERS=3 LEARNER_CONSTRAINTS=\"[+region=sh]\" NULL]\n[DATABASE db2 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" PENDING]\n[TABLE db2.t2 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" PENDING]\n[TABLE test.t1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n[TABLE test.t3 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n[TABLE test.t3 PARTITION p0 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" PENDING]\n[TABLE test.t3 PARTITION p1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n[TABLE test.t3 PARTITION p2 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n"
        	            	actual  : "[POLICY pa1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" NULL]\n[POLICY pa2 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" NULL]\n[POLICY pb1 CONSTRAINTS=\"[+disk=ssd]\" VOTERS=5 VOTER_CONSTRAINTS=\"[+region=bj]\" LEARNERS=3 LEARNER_CONSTRAINTS=\"[+region=sh]\" NULL]\n[DATABASE db2 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" PENDING]\n[TABLE test.t1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n[TABLE test.t3 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n[TABLE test.t3 PARTITION p0 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" PENDING]\n[TABLE test.t3 PARTITION p1 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n[TABLE test.t3 PARTITION p2 PRIMARY_REGION=\"cn-east-1\" REGIONS=\"cn-east-1,cn-east-2\" SCHEDULE=\"EVEN\" SURVIVAL_PREFERENCES=\"[zone, dc, host]\" PENDING]\n[TABLE db2.t2 LEADER_CONSTRAINTS=\"[+region=us-east-1]\" FOLLOWERS=3 FOLLOWER_CONSTRAINTS=\"[+region=us-east-2]\" PENDING]\n"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -4,3 +4,2 @@
        	            	 [DATABASE db2 LEADER_CONSTRAINTS="[+region=us-east-1]" FOLLOWERS=3 FOLLOWER_CONSTRAINTS="[+region=us-east-2]" PENDING]
        	            	-[TABLE db2.t2 LEADER_CONSTRAINTS="[+region=us-east-1]" FOLLOWERS=3 FOLLOWER_CONSTRAINTS="[+region=us-east-2]" PENDING]
        	            	 [TABLE test.t1 PRIMARY_REGION="cn-east-1" REGIONS="cn-east-1,cn-east-2" SCHEDULE="EVEN" SURVIVAL_PREFERENCES="[zone, dc, host]" PENDING]
        	            	@@ -10,2 +9,3 @@
        	            	 [TABLE test.t3 PARTITION p2 PRIMARY_REGION="cn-east-1" REGIONS="cn-east-1,cn-east-2" SCHEDULE="EVEN" SURVIVAL_PREFERENCES="[zone, dc, host]" PENDING]
        	            	+[TABLE db2.t2 LEADER_CONSTRAINTS="[+region=us-east-1]" FOLLOWERS=3 FOLLOWER_CONSTRAINTS="[+region=us-east-2]" PENDING]
        	            	 
        	Test:       	TestShowPlacement
        	Messages:   	sql:show placement, args:[]

4. What is your TiDB version? (Required)