diff --git a/include/common/tdataformat.h b/include/common/tdataformat.h
index 073d796717013feccf61867078215503c443bc37..6a73d3d67839bde8c63c0710170602e2ddfa8ad1 100644
--- a/include/common/tdataformat.h
+++ b/include/common/tdataformat.h
@@ -41,6 +41,9 @@ typedef struct STag          STag;
 int32_t tTSchemaCreate(int32_t sver, SSchema *pSchema, int32_t nCols, STSchema **ppTSchema);
 void    tTSchemaDestroy(STSchema *pTSchema);
 
+// SValue
+int tValueCmprFn(const SValue *pValue1, const SValue *pValue2, int8_t type);
+
 // STSRow2
 #define COL_VAL_NONE(CID)     ((SColVal){.cid = (CID), .isNone = 1})
 #define COL_VAL_NULL(CID)     ((SColVal){.cid = (CID), .isNull = 1})
diff --git a/source/common/src/tdataformat.c b/source/common/src/tdataformat.c
index 287dba6d3badaa1c4a1f077d8cea805981da09e7..9aa94b0216ee219e0bc294ae3988a11b14f3ffe4 100644
--- a/source/common/src/tdataformat.c
+++ b/source/common/src/tdataformat.c
@@ -36,8 +36,6 @@ typedef struct {
 #define GET_BIT1(p, i)     (((p)[(i) / 8] >> ((i) % 8)) & ((uint8_t)1))
 #define GET_BIT2(p, i)     (((p)[(i) / 4] >> ((i) % 4)) & ((uint8_t)3))
 
-static FORCE_INLINE int tSKVIdxCmprFn(const void *p1, const void *p2);
-
 // SValue
 static FORCE_INLINE int32_t tPutValue(uint8_t *p, SValue *pValue, int8_t type) {
   int32_t n = 0;
@@ -141,6 +139,11 @@ static FORCE_INLINE int32_t tGetValue(uint8_t *p, SValue *pValue, int8_t type) {
   return n;
 }
 
+int tValueCmprFn(const SValue *pValue1, const SValue *pValue2, int8_t type) {
+  // TODO
+  return 0;
+}
+
 // STSRow2 ========================================================================
 static void setBitMap(uint8_t *pb, uint8_t v, int32_t idx, uint8_t flags) {
   if (pb) {