flaky test TestTableIfHasColumn

[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:	/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/infoschema/infoschema_test_/infoschema_test.runfiles/__main__/infoschema/result.go:49
        	            				/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/infoschema/infoschema_test_/infoschema_test.runfiles/__main__/infoschema/tables_test.go:757
        	Error:      	Not equal: 
        	            	expected: "[1]\n"
        	            	actual  : ""
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1,2 +1 @@
        	            	-[1]
        	            	 
        	Test:       	TestTableIfHasColumn
        	Messages:   	sql:select Has_more_results from information_schema.slow_query, args:[]
    tables_test.go:747: 
        	Error Trace:	/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/infoschema/infoschema_test_/infoschema_test.runfiles/__main__/infoschema/tables_test.go:747
        	            				/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/infoschema/infoschema_test_/infoschema_test.runfiles/__main__/infoschema/panic.go:522
        	            				/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/infoschema/infoschema_test_/infoschema_test.runfiles/__main__/infoschema/testing.go:871
        	            				/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/infoschema/infoschema_test_/infoschema_test.runfiles/__main__/infoschema/result.go:49
        	            				/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/execroot/__main__/bazel-out/k8-fastbuild/bin/infoschema/infoschema_test_/infoschema_test.runfiles/__main__/infoschema/tables_test.go:757
        	Error:      	Received unexpected error:
        	            	remove tidb-slow.log: no such file or directory
        	Test:       	TestTableIfHasColumn

4. What is your TiDB version? (Required)