Var tidb_stmt_summary_max_stmt_count does not work

[jingshanglu]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

set global tidb_stmt_summary_max_stmt_count=1;
drop table if exists t_1;
drop table if exists t_2;
select count(*) from information_schema.statements_summary;

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

mysql> select count(*) from information_schema.statements_summary;
+----------+
| count(*) |
+----------+
|        1 |
+----------+

3. What did you see instead (Required)

mysql> select count(*) from information_schema.statements_summary;
+----------+
| count(*) |
+----------+
|        2 |
+----------+

4. What is your TiDB version? (Required)

master
commit : (deb6dad)

[ClSlaid]

this is a new row of records in statements summary, you can check #25031 for details.
docs are on the way.

[bb7133]

Change it to 'minor' because according to #25031, the behavior is expected(but anti-intuitive)

[ti-srebot]

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