>mysql -uroot -pxxx -P3317 -e"select @@version\Gselect @@optimizer_switch\G"

*************************** 1. row ***************************

@@version: 10.2.5-MariaDB

*************************** 1. row ***************************

@@optimizer_switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,

firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=

on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on

C:\>mysql -uroot -pxxx -P3317 < test_case_obfuscated.sql

assignment_group

ebb4620037332000158bbfc8bcbe5d89

C:\>mysql -uroot -pxxx -P3317 -e"set @@global.optimizer_switch='materialization=off'"

C:\>mysql -uroot -pxxx -P3317 -e"select @@version\Gselect @@optimizer_switch\G"

*************************** 1. row ***************************

@@version: 10.2.5-MariaDB

*************************** 1. row ***************************

@@optimizer_switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,

firstmatch=on,loosescan=on,materialization=off,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=

on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on

C:\>mysql -uroot -pxxx -P3317 < test_case_obfuscated.sql

assignment_group

ebb4620037332000158bbfc8bcbe5d89

ec70316637232000158bbfc8bcbe5d60

3120fd2637232000158bbfc8bcbe5d42

e08fad2637232000158bbfc8bcbe5d39