diff --git a/storage/rocksdb/rdb_index_merge.h b/storage/rocksdb/rdb_index_merge.h
new file mode 100644
index 0000000000000000000000000000000000000000..afe7e09612ca244140e0d026e35b2cea44f83787
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+++ b/storage/rocksdb/rdb_index_merge.h
@@ -0,0 +1,41 @@
+/*
+   Copyright (c) 2016, Facebook, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#pragma once
+
+/* MySQL header files */
+#include "src/interface/handler.h" /* handler */
+
+/* C++ standard header files */
+#include <queue>
+#include <set>
+#include <vector>
+
+/* RocksDB header files */
+#include "rocksdb/db.h"
+
+/* MyRocks header files */
+#include "./rdb_comparator.h"
+
+namespace myrocks {
+
+/*
+  Length of delimiters used during inplace index creation.
+*/
+#define RDB_MERGE_CHUNK_LEN sizeof(size_t)
+#define RDB_MERGE_REC_DELIMITER sizeof(size_t)
+#define RDB_MERGE_KEY_DELIMITER RDB_MERGE_REC_DELIMITER
+#define RDB_MERGE_VAL_DELIMITER RDB_MERGE_REC_DELIMITER