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)

    seq_executor_test.go:690: 

        	Error Trace:	executor/seqtest/seq_executor_test.go:690

        	Error:      	Should be false

        	Test:       	TestIndexMergeReaderClose

4. What is your TiDB version? (Required)