diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5fee2e548aaf66e0769a0da569c6d910969179ba..946ceb95aba3fefdcda62d6aa5f497a377e98124 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,7 @@ ENDIF ()
 SET(TD_ACCOUNT FALSE)
 SET(TD_ADMIN FALSE)
 SET(TD_GRANT FALSE)
+SET(TD_TSDB_PLUGINS FALSE)
 
 SET(TD_COVER FALSE)
 SET(TD_MEM_CHECK FALSE)
diff --git a/cmake/define.inc b/cmake/define.inc
index 0a25dd9ee71df0d16cdf921fde6a923529192421..6dd604057c06d504c881cf57018429c9694bc4b9 100755
--- a/cmake/define.inc
+++ b/cmake/define.inc
@@ -13,6 +13,10 @@ IF (TD_GRANT)
   ADD_DEFINITIONS(-D_GRANT)
 ENDIF ()
 
+IF (TD_TSDB_PLUGINS)
+  ADD_DEFINITIONS(-D_TSDB_PLUGINS)
+ENDIF ()
+
 IF (TD_GODLL)
   ADD_DEFINITIONS(-D_TD_GO_DLL_)
 ENDIF ()
diff --git a/src/tsdb/inc/tsdbMain.h b/src/tsdb/inc/tsdbMain.h
index ede0b33d01d1e7735a5db469437aa572e19986ec..256b8189f8fc69345b27fdf702fb705d22ac3c10 100644
--- a/src/tsdb/inc/tsdbMain.h
+++ b/src/tsdb/inc/tsdbMain.h
@@ -320,6 +320,16 @@ typedef struct {
   void*      compBuffer;  // Buffer for temperary compress/decompress purpose
 } SRWHelper;
 
+// ------------------ tsdbScan.c
+typedef struct {
+  SFileGroup fGroup;
+  int        numOfIdx;
+  SCompIdx*  pCompIdx;
+  SCompInfo* pCompInfo;
+  void*      pBuf;
+  FILE*      tLogStream;
+} STsdbScanHandle;
+
 // Operations
 // ------------------ tsdbMeta.c
 #define TSDB_INIT_NTABLES 1024
@@ -552,6 +562,16 @@ STsdbMeta*  tsdbGetMeta(TSDB_REPO_T* pRepo);
 STsdbFileH* tsdbGetFile(TSDB_REPO_T* pRepo);
 int         tsdbCheckCommit(STsdbRepo* pRepo);
 
+// ------------------ tsdbScan.c
+int              tsdbScanFGroup(STsdbScanHandle* pScanHandle, char* rootDir, int fid);
+STsdbScanHandle* tsdbNewScanHandle();
+void             tsdbSetScanLogStream(STsdbScanHandle* pScanHandle, FILE* fLogStream);
+int              tsdbSetAndOpenScanFile(STsdbScanHandle* pScanHandle, char* rootDir, int fid);
+int              tsdbScanSCompIdx(STsdbScanHandle* pScanHandle);
+int              tsdbScanSCompBlock(STsdbScanHandle* pScanHandle, int idx);
+int              tsdbCloseScanFile(STsdbScanHandle* pScanHandle);
+void             tsdbFreeScanHandle(STsdbScanHandle* pScanHandle);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/tsdb/src/tsdbScan.c b/src/tsdb/src/tsdbScan.c
index 6dea4a4e57392be988126c579648f39a8270b9bf..98fe1fd44436c65e6188a35908ba7a13d8fb46a2 100644
--- a/src/tsdb/src/tsdbScan.c
+++ b/src/tsdb/src/tsdbScan.c
@@ -11,4 +11,26 @@
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
\ No newline at end of file
+ */
+
+#include "tsdbMain.h"
+
+#ifndef _TSDB_PLUGINS
+
+int tsdbScanFGroup(STsdbScanHandle* pScanHandle, char* rootDir, int fid) { return 0; }
+
+STsdbScanHandle* tsdbNewScanHandle() { return NULL; }
+
+void tsdbSetScanLogStream(STsdbScanHandle* pScanHandle, FILE* fLogStream) {}
+
+int tsdbSetAndOpenScanFile(STsdbScanHandle* pScanHandle, char* rootDir, int fid) { return 0 }
+
+int tsdbScanSCompIdx(STsdbScanHandle* pScanHandle) { return 0; }
+
+int tsdbScanSCompBlock(STsdbScanHandle* pScanHandle, int idx) { return 0; }
+
+int tsdbCloseScanFile(STsdbScanHandle* pScanHandle) { return 0; }
+
+void tsdbFreeScanHandle(STsdbScanHandle* pScanHandle) {}
+
+#endif
\ No newline at end of file