refactor index directory

src/observer/storage/default/default_handler.cpp

@@ -20,7 +20,7 @@ See the Mulan PSL v2 for more details. */
 #include "common/log/log.h"
 #include "common/lang/string.h"
 #include "storage/common/record_manager.h"
-#include "storage/common/bplus_tree.h"
+#include "storage/index/bplus_tree.h"
 #include "storage/common/table.h"
 #include "storage/common/condition_filter.h"
 
@@ -230,4 +230,4 @@ RC DefaultHandler::sync()
     }
   }
   return rc;
-}
+}
\ No newline at end of file

unitest/bplus_tree_test.cpp

@@ -15,7 +15,7 @@ See the Mulan PSL v2 for more details. */
 #include <list>
 #include <iostream>
 
-#include "storage/common/bplus_tree.h"
+#include "storage/index/bplus_tree.h"
 #include "storage/default/disk_buffer_pool.h"
 #include "rc.h"
 #include "common/log/log.h"