Segmentation fault

[root@qk-yunwei sqladvisor]# ./sqladvisor -h 192.168.1.XX -P 3306 -u XXX-p 'XXX' -d qk_auth -q "select af.* from auth_function af inner join auth_function_permission afp on af.id = afp.function_id where af.id=1;" -v 1
2017-07-28 15:44:12 1198 [Note] 2017-07-28 15:44:12 1198 [Note] 第2步：开始解析where中的条件:(af.id = 1)

2017-07-28 15:44:12 1198 [Note] show index from auth_function

2017-07-28 15:44:12 1198 [Note] show table status like 'auth_function'

2017-07-28 15:44:12 1198 [Note] select count(*) from ( select id from auth_function FORCE INDEX( PRIMARY ) order by id DESC limit 13) af where (af.id = 1)

2017-07-28 15:44:12 1198 [Note] 第3步：表auth_function的行数:27,limit行数:13,得到where条件中(af.id = 1)的选择度:13

2017-07-28 15:44:12 1198 [Note] 第4步：开始解析join on条件:af.id=afp.function_id

2017-07-28 15:44:12 1198 [Note] 第5步：开始选择驱动表,一共有2个候选驱动表

2017-07-28 15:44:12 1198 [Note] explain select * from auth_function

Segmentation fault

Reproduce the reported command and query against the same SQLAdvisor scenario, then inspect the path after step 5 when it runs explain select * from auth_function and crashes. The issue names no source file or test, so first locate the EXPLAIN and driver-table selection entry points. Done means the query no longer segfaults and the regression is covered by an appropriate test.