cleanup: remove unused variables

sql/mysqld.cc

@@ -528,10 +528,6 @@ my_decimal decimal_zero;
 */
 ulong max_long_data_size;
 
-/* Limits for internal temporary tables (MyISAM or Aria) */
-uint internal_tmp_table_max_key_length;
-uint internal_tmp_table_max_key_segments;
-
 bool max_user_connections_checking=0;
 /**
   Limit of the total number of prepared statements in the server.
@@ -5151,11 +5147,6 @@ a file name for --log-bin-index option", opt_binlog_index_name);
     sql_print_error("Aria engine is not enabled or did not start. The Aria engine must be enabled to continue as mysqld was configured with --with-aria-tmp-tables");
     unireg_abort(1);
   }
-  internal_tmp_table_max_key_length=   maria_max_key_length();
-  internal_tmp_table_max_key_segments= maria_max_key_segments();
-#else
-  internal_tmp_table_max_key_length=   myisam_max_key_length();
-  internal_tmp_table_max_key_segments= myisam_max_key_segments();
 #endif
 
 #ifdef WITH_WSREP

sql/mysqld.h

@@ -758,9 +758,6 @@ extern ulong binlog_checksum_options;
 extern bool max_user_connections_checking;
 extern ulong opt_binlog_dbug_fsync_sleep;
 
-extern uint internal_tmp_table_max_key_length;
-extern uint internal_tmp_table_max_key_segments;
-
 extern uint volatile global_disable_checkpoint;
 extern my_bool opt_help;