topsql failed catch the running SQL when Top SQL is enabled in execution

[crazycs520]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

1. Create table t1 and insert into 10000000 rows data.
2. Execute following SQLs in client-A and client-B at same time:

select count(*),sum(a+b),sum(b+d),sum(c+d*2), sum(d*2+a*b), avg(a*b*d), avg(b*c), avg(c*d),avg(a*b*d), avg(2*b*c), avg(3*c*d), sum(a*b*c), sum(b*d) from t1;

select count(*) from t1 as t0 join t1 as t1 on t0.a != t1.a;

3. enable TopSQL during the upper SQL execution:

set @@global.tidb_enable_top_sql=1;

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

TopSQL should catch the running SQL when Top SQL is enabled in execution.

3. What did you see instead (Required)

topsql failed catch the running SQL when Top SQL is enabled in execution.

4. What is your TiDB version? (Required)

0d7602eb6551c9a53732be4da37d6ac2f22e375d (HEAD -> master, origin/master)