设置performance_schema_max_digest_length=1048576时performance_schema无法正常工作的bug

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简介

performance_schema_max_digest_length用于控制performance_schema在做sql统计分析时，可以保留的sql语句的最大长度，官方文档上此值范围在0-1048576之间，而当设置此值为1048576时，performance_schema无法正常的工作。
影响版本：mysql-5.7.19

复现

Description:
Add
"performance_schema_max_digest_length=1048576"
to my.cnf and then restart the server.

mysql> show global variables like '%performance%'
    -> ;
Empty set (0.00 sec)

mysql> 
mysql> 
mysql> 
mysql> select * from performance_schema.setup_actors;
Empty set (0.01 sec)

mysql> select * from performance_schema.setup_consumers;
Empty set (0.00 sec)

How to repeat:
Add performance_schema_max_digest_length=1048576 to my.cnf.

and restart mysqld.