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)

    integration_test.go:3818: 
        	Error Trace:	planner/core/integration_test.go:3818
        	Error:      	Should be true
        	Test:       	TestAggPushToCopForCachedTable

https://do.pingcap.net/jenkins/blue/rest/organizations/jenkins/pipelines/pingcap/pipelines/tidb/pipelines/ghpr_unit_test/runs/25232/nodes/59/steps/64/log/?start=0

4. What is your TiDB version? (Required)