MDEV-34380: Set optimizer_switch='cset_narrowing=on' by default

mysql-test/main/mysqld--help.result

@@ -1829,7 +1829,7 @@ optimizer-rowid-copy-cost 0.002653
 optimizer-scan-setup-cost 10
 optimizer-search-depth 62
 optimizer-selectivity-sampling-limit 100
-optimizer-switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=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=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off,hash_join_cardinality=on,cset_narrowing=off,sargable_casefold=on
+optimizer-switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=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=on,table_elimination=on,extended_keys=on,exists_to_in=on,orderby_uses_equalities=on,condition_pushdown_for_derived=on,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off,hash_join_cardinality=on,cset_narrowing=on,sargable_casefold=on
 optimizer-trace 
 optimizer-trace-max-mem-size 1048576
 optimizer-use-condition-selectivity 4

mysql-test/main/mysqltest_tracking_info.result

@@ -38,7 +38,7 @@ SET @@session.session_track_system_variables='optimizer_switch';
 set optimizer_switch='index_merge=off,index_merge_union=off,index_merge_sort_union=off,index_merge_intersection=off,index_merge_sort_intersection=on,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=on,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=on,mrr_cost_based=on,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=on,table_elimination=off,extended_keys=off,exists_to_in=off,orderby_uses_equalities=off,condition_pushdown_for_derived=off';
 -- Tracker : SESSION_TRACK_SYSTEM_VARIABLES
 -- optimizer_switch
--- index_merge=off,index_merge_union=off,index_merge_sort_union=off,index_merge_intersection=off,index_merge_sort_intersection=on,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=on,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=on,mrr_cost_based=on,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=on,table_elimination=off,extended_keys=off,exists_to_in=off,orderby_uses_equalities=off,condition_pushdown_for_derived=off,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off,hash_join_cardinality=on,cset_narrowing=off,sargable_casefold=on
+-- index_merge=off,index_merge_union=off,index_merge_sort_union=off,index_merge_intersection=off,index_merge_sort_intersection=on,index_condition_pushdown=off,derived_merge=off,derived_with_keys=off,firstmatch=off,loosescan=off,materialization=on,in_to_exists=off,semijoin=off,partial_match_rowid_merge=off,partial_match_table_scan=off,subquery_cache=off,mrr=on,mrr_cost_based=on,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=off,join_cache_hashed=off,join_cache_bka=off,optimize_join_buffer_size=on,table_elimination=off,extended_keys=off,exists_to_in=off,orderby_uses_equalities=off,condition_pushdown_for_derived=off,split_materialized=on,condition_pushdown_for_subquery=on,rowid_filter=on,condition_pushdown_from_having=on,not_null_range_scan=off,hash_join_cardinality=on,cset_narrowing=on,sargable_casefold=on
 
 set @@optimizer_switch=@save_optimizer_switch;
 SET @@session.session_track_system_variables= @save_session_track_system_variables;

mysql-test/suite/sysschema/r/optimizer_switch.result

@@ -3,6 +3,7 @@ option	opt
 condition_pushdown_for_derived	on
 condition_pushdown_for_subquery	on
 condition_pushdown_from_having	on
+cset_narrowing	on
 derived_merge	on
 derived_with_keys	on
 exists_to_in	on
@@ -34,7 +35,6 @@ subquery_cache	on
 table_elimination	on
 call sys.optimizer_switch_off();
 option	opt
-cset_narrowing	off
 index_merge_sort_intersection	off
 mrr	off
 mrr_cost_based	off

sql/sql_priv.h

@@ -176,6 +176,16 @@
 #define OPTIMIZER_SWITCH_CSET_NARROWING            (1ULL << 36)
 #define OPTIMIZER_SWITCH_SARGABLE_CASEFOLD         (1ULL << 37)
 
+
+/*
+  Tests that need to be updated after changing OPTIMIZER_SWITCH_DEFAULT:
+
+  ./mysql-test-run --force --mem
+      main.mysqld--help \
+      main.mysqltest_tracking_info \
+      sys_vars.optimizer_switch_basic \
+      sysschema.optimizer_switch
+*/
 #define OPTIMIZER_SWITCH_DEFAULT (OPTIMIZER_SWITCH_INDEX_MERGE | \
                                   OPTIMIZER_SWITCH_INDEX_MERGE_UNION | \
                                   OPTIMIZER_SWITCH_INDEX_MERGE_SORT_UNION | \
@@ -207,6 +217,7 @@
                                   OPTIMIZER_SWITCH_COND_PUSHDOWN_FROM_HAVING | \
                                   OPTIMIZER_SWITCH_OPTIMIZE_JOIN_BUFFER_SIZE |\
                                   OPTIMIZER_SWITCH_HASH_JOIN_CARDINALITY |\
+                                  OPTIMIZER_SWITCH_CSET_NARROWING  |\
                                   OPTIMIZER_SWITCH_SARGABLE_CASEFOLD)
 /*
   Replication uses 8 bytes to store SQL_MODE in the binary log. The day you