remove HTON_FLUSH_AFTER_RENAME (BDB-ism, unused for years)

sql/handler.h

@@ -1369,7 +1369,6 @@ handlerton *ha_default_tmp_handlerton(THD *thd);
 #define HTON_ALTER_NOT_SUPPORTED     (1 << 1) //Engine does not support alter
 #define HTON_CAN_RECREATE            (1 << 2) //Delete all is used for truncate
 #define HTON_HIDDEN                  (1 << 3) //Engine does not appear in lists
-#define HTON_FLUSH_AFTER_RENAME      (1 << 4)
 #define HTON_NOT_USER_SELECTABLE     (1 << 5)
 #define HTON_TEMPORARY_NOT_SUPPORTED (1 << 6) //Having temporary tables not supported
 #define HTON_SUPPORT_LOG_TABLES      (1 << 7) //Engine supports log tables

sql/sql_table.cc

@@ -9073,24 +9073,6 @@ end_inplace:
   if (write_bin_log(thd, true, thd->query(), thd->query_length()))
     DBUG_RETURN(true);
 
-  if (ha_check_storage_engine_flag(old_db_type, HTON_FLUSH_AFTER_RENAME))
-  {
-    /*
-      For the alter table to be properly flushed to the logs, we
-      have to open the new table.  If not, we get a problem on server
-      shutdown. But we do not need to attach MERGE children.
-    */
-    TABLE *t_table;
-    t_table= open_table_uncached(thd, new_db_type, alter_ctx.get_new_path(),
-                                 alter_ctx.new_db, alter_ctx.new_name,
-                                 false, true);
-    if (t_table)
-      intern_close_table(t_table);
-    else
-      sql_print_warning("Could not open table %s.%s after rename\n",
-                        alter_ctx.new_db, alter_ctx.table_name);
-    ha_flush_logs(old_db_type);
-  }
   table_list->table= NULL;			// For query cache
   query_cache_invalidate3(thd, table_list, false);