diff --git a/src/common/inc/tdataformat.h b/src/common/inc/tdataformat.h
index 10ca75f785f4ab4c0f88d54ff17ab41fa21bcd8a..ba37db519e204c916360e5642c00ee317d05ae46 100644
--- a/src/common/inc/tdataformat.h
+++ b/src/common/inc/tdataformat.h
@@ -114,10 +114,10 @@ static FORCE_INLINE void *tdGetRowDataOfCol(SDataRow row, int8_t type, int32_t o
   switch (type) {
     case TSDB_DATA_TYPE_BINARY:
     case TSDB_DATA_TYPE_NCHAR:
-      return POINTER_DRIFT(row, *(VarDataOffsetT *)POINTER_DRIFT(row, offset));
+      return POINTER_SHIFT(row, *(VarDataOffsetT *)POINTER_SHIFT(row, offset));
       break;
     default:
-      return POINTER_DRIFT(row, offset);
+      return POINTER_SHIFT(row, offset);
       break;
   }
 }
@@ -149,11 +149,11 @@ static FORCE_INLINE void *tdGetColDataOfRow(SDataCol *pCol, int row) {
   switch (pCol->type) {
     case TSDB_DATA_TYPE_BINARY:
     case TSDB_DATA_TYPE_NCHAR:
-      return POINTER_DRIFT(pCol->pData, pCol->dataOff[row]);
+      return POINTER_SHIFT(pCol->pData, pCol->dataOff[row]);
       break;
 
     default:
-      return POINTER_DRIFT(pCol->pData, TYPE_BYTES[pCol->type] * row);
+      return POINTER_SHIFT(pCol->pData, TYPE_BYTES[pCol->type] * row);
       break;
   }
 }
diff --git a/src/common/src/tdataformat.c b/src/common/src/tdataformat.c
index 28f42f85a59683a6025fbf5dd409212dc7c619f2..9d81cd07af47ec20b727fc0a1e945bb289823964 100644
--- a/src/common/src/tdataformat.c
+++ b/src/common/src/tdataformat.c
@@ -167,17 +167,17 @@ void tdFreeDataRow(SDataRow row) {
 int tdAppendColVal(SDataRow row, void *value, int8_t type, int32_t bytes, int32_t offset) {
   ASSERT(value != NULL);
   int32_t toffset = offset + TD_DATA_ROW_HEAD_SIZE;
-  char *  ptr = POINTER_DRIFT(row, dataRowLen(row));
+  char *  ptr = POINTER_SHIFT(row, dataRowLen(row));
 
   switch (type) {
     case TSDB_DATA_TYPE_BINARY:
     case TSDB_DATA_TYPE_NCHAR:
-      *(VarDataOffsetT *)POINTER_DRIFT(row, toffset) = dataRowLen(row);
+      *(VarDataOffsetT *)POINTER_SHIFT(row, toffset) = dataRowLen(row);
       memcpy(ptr, value, varDataTLen(value));
       dataRowLen(row) += varDataTLen(value);
       break;
     default:
-      memcpy(POINTER_DRIFT(row, toffset), value, TYPE_BYTES[type]);
+      memcpy(POINTER_SHIFT(row, toffset), value, TYPE_BYTES[type]);
       break;
   }
 
@@ -202,13 +202,13 @@ void dataColInit(SDataCol *pDataCol, STColumn *pCol, void **pBuf, int maxPoints)
   if (pDataCol->type == TSDB_DATA_TYPE_BINARY || pDataCol->type == TSDB_DATA_TYPE_NCHAR) {
     pDataCol->spaceSize = (sizeof(VarDataLenT) + pDataCol->bytes) * maxPoints;
     pDataCol->dataOff = (VarDataOffsetT *)(*pBuf);
-    pDataCol->pData = POINTER_DRIFT(*pBuf, TYPE_BYTES[pDataCol->type] * maxPoints);
-    *pBuf = POINTER_DRIFT(*pBuf, pDataCol->spaceSize + TYPE_BYTES[pDataCol->type] * maxPoints);
+    pDataCol->pData = POINTER_SHIFT(*pBuf, TYPE_BYTES[pDataCol->type] * maxPoints);
+    *pBuf = POINTER_SHIFT(*pBuf, pDataCol->spaceSize + TYPE_BYTES[pDataCol->type] * maxPoints);
   } else {
     pDataCol->spaceSize = pDataCol->bytes * maxPoints;
     pDataCol->dataOff = NULL;
     pDataCol->pData = *pBuf;
-    *pBuf = POINTER_DRIFT(*pBuf, pDataCol->spaceSize);
+    *pBuf = POINTER_SHIFT(*pBuf, pDataCol->spaceSize);
   }
 
 }
@@ -222,13 +222,13 @@ void dataColAppendVal(SDataCol *pCol, void *value, int numOfPoints, int maxPoint
       // set offset
       pCol->dataOff[numOfPoints] = pCol->len;
       // Copy data
-      memcpy(POINTER_DRIFT(pCol->pData, pCol->len), value, varDataTLen(value));
+      memcpy(POINTER_SHIFT(pCol->pData, pCol->len), value, varDataTLen(value));
       // Update the length
       pCol->len += varDataTLen(value);
       break;
     default:
       ASSERT(pCol->len == TYPE_BYTES[pCol->type] * numOfPoints);
-      memcpy(POINTER_DRIFT(pCol->pData, pCol->len), value, pCol->bytes);
+      memcpy(POINTER_SHIFT(pCol->pData, pCol->len), value, pCol->bytes);
       pCol->len += pCol->bytes;
       break;
   }
@@ -244,12 +244,12 @@ void dataColPopPoints(SDataCol *pCol, int pointsToPop, int numOfPoints) {
     VarDataOffsetT toffset = pCol->dataOff[pointsToPop];
     pCol->len = pCol->len - toffset;
     ASSERT(pCol->len > 0);
-    memmove(pCol->pData, POINTER_DRIFT(pCol->pData, toffset), pCol->len);
+    memmove(pCol->pData, POINTER_SHIFT(pCol->pData, toffset), pCol->len);
     dataColSetOffset(pCol, pointsLeft);
   } else {
     ASSERT(pCol->len == TYPE_BYTES[pCol->type] * numOfPoints);
     pCol->len = TYPE_BYTES[pCol->type] * pointsLeft;
-    memmove(pCol->pData, POINTER_DRIFT(pCol->pData, TYPE_BYTES[pCol->type] * pointsToPop), pCol->len);
+    memmove(pCol->pData, POINTER_SHIFT(pCol->pData, TYPE_BYTES[pCol->type] * pointsToPop), pCol->len);
   }
 }
 
@@ -301,7 +301,7 @@ void dataColSetOffset(SDataCol *pCol, int nEle) {
   for (int i = 0; i < nEle; i++) {
     pCol->dataOff[i] = offset;
     offset += varDataTLen(tptr);
-    tptr = POINTER_DRIFT(tptr, varDataTLen(tptr));
+    tptr = POINTER_SHIFT(tptr, varDataTLen(tptr));
   }
 }
 
diff --git a/src/tsdb/inc/tsdbMain.h b/src/tsdb/inc/tsdbMain.h
index e056a10bbab38e423bc2e978c0a344987bebc836..a681c865c9ee2640b8ea22e526009b8238e83f52 100644
--- a/src/tsdb/inc/tsdbMain.h
+++ b/src/tsdb/inc/tsdbMain.h
@@ -21,6 +21,7 @@
 #include "tskiplist.h"
 #include "tutil.h"
 #include "tlog.h"
+#include "tcoding.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/src/tsdb/src/tsdbMeta.c b/src/tsdb/src/tsdbMeta.c
index ec4fb2a33f91db36bbae2f55aac8312fc7874610..63ccb538ed6e8d40df46241219e16c46cf87e1ab 100644
--- a/src/tsdb/src/tsdbMeta.c
+++ b/src/tsdb/src/tsdbMeta.c
@@ -535,5 +535,5 @@ static int tsdbEstimateTableEncodeSize(STable *pTable) {
 char *getTupleKey(const void * data) {
   SDataRow row = (SDataRow)data;
 
-  return POINTER_DRIFT(row, TD_DATA_ROW_HEAD_SIZE);
+  return POINTER_SHIFT(row, TD_DATA_ROW_HEAD_SIZE);
 }
\ No newline at end of file
diff --git a/src/util/inc/tcoding.h b/src/util/inc/tcoding.h
index f3e7a5294233b73068197d31608fa9327a1e535e..e74222cb9b80639bbde0767bbf5443f0476339b9 100644
--- a/src/util/inc/tcoding.h
+++ b/src/util/inc/tcoding.h
@@ -24,96 +24,145 @@ extern "C" {
 
 #include "tutil.h"
 
-const int TNUMBER = 1;
-#define IS_LITTLE_ENDIAN() (*(char *)(&TNUMBER) != 0)
+const int32_t TNUMBER = 1;
+const uint8_t ENCODE_LIMIT = (1 << 7);
+#define IS_LITTLE_ENDIAN() (*(uint8_t *)(&TNUMBER) != 0)
 
 static FORCE_INLINE void *taosEncodeFixed16(void *buf, uint16_t value) {
   if (IS_LITTLE_ENDIAN()) {
     memcpy(buf, &value, sizeof(value));
   } else {
-    ((char *)buf)[0] = value & 0xff;
-    ((char *)buf)[1] = (value >> 8) & 0xff;
+    ((uint8_t *)buf)[0] = value & 0xff;
+    ((uint8_t *)buf)[1] = (value >> 8) & 0xff;
   }
 
-  return POINTER_DRIFT(buf, sizeof(value));
+  return POINTER_SHIFT(buf, sizeof(value));
 }
 
 static FORCE_INLINE void *taosEncodeFixed32(void *buf, uint32_t value) {
   if (IS_LITTLE_ENDIAN()) {
     memcpy(buf, &value, sizeof(value));
   } else {
-    ((char *)buf)[0] = value & 0xff;
-    ((char *)buf)[1] = (value >> 8) & 0xff;
-    ((char *)buf)[2] = (value >> 16) & 0xff;
-    ((char *)buf)[3] = (value >> 24) & 0xff;
+    ((uint8_t *)buf)[0] = value & 0xff;
+    ((uint8_t *)buf)[1] = (value >> 8) & 0xff;
+    ((uint8_t *)buf)[2] = (value >> 16) & 0xff;
+    ((uint8_t *)buf)[3] = (value >> 24) & 0xff;
   }
 
-  return POINTER_DRIFT(buf, sizeof(value));
+  return POINTER_SHIFT(buf, sizeof(value));
 }
 
 static FORCE_INLINE void *taosEncodeFixed64(void *buf, uint64_t value) {
   if (IS_LITTLE_ENDIAN()) {
     memcpy(buf, &value, sizeof(value));
   } else {
-    ((char *)buf)[0] = value & 0xff;
-    ((char *)buf)[1] = (value >> 8) & 0xff;
-    ((char *)buf)[2] = (value >> 16) & 0xff;
-    ((char *)buf)[3] = (value >> 24) & 0xff;
-    ((char *)buf)[4] = (value >> 32) & 0xff;
-    ((char *)buf)[5] = (value >> 40) & 0xff;
-    ((char *)buf)[6] = (value >> 48) & 0xff;
-    ((char *)buf)[7] = (value >> 56) & 0xff;
+    ((uint8_t *)buf)[0] = value & 0xff;
+    ((uint8_t *)buf)[1] = (value >> 8) & 0xff;
+    ((uint8_t *)buf)[2] = (value >> 16) & 0xff;
+    ((uint8_t *)buf)[3] = (value >> 24) & 0xff;
+    ((uint8_t *)buf)[4] = (value >> 32) & 0xff;
+    ((uint8_t *)buf)[5] = (value >> 40) & 0xff;
+    ((uint8_t *)buf)[6] = (value >> 48) & 0xff;
+    ((uint8_t *)buf)[7] = (value >> 56) & 0xff;
   }
 
-  return POINTER_DRIFT(buf, sizeof(value));
+  return POINTER_SHIFT(buf, sizeof(value));
 }
 
 static FORCE_INLINE void *taosDecodeFixed16(void *buf, uint16_t *value) {
   if (IS_LITTLE_ENDIAN()) {
     memcpy(value, buf, sizeof(*value));
   } else {
-    ((char *)value)[1] = ((char *)buf)[0];
-    ((char *)value)[0] = ((char *)buf)[1];
+    ((uint8_t *)value)[1] = ((uint8_t *)buf)[0];
+    ((uint8_t *)value)[0] = ((uint8_t *)buf)[1];
   }
 
-  return POINTER_DRIFT(buf, sizeof(*value));
+  return POINTER_SHIFT(buf, sizeof(*value));
 }
 
 static FORCE_INLINE void *taosDecodeFixed32(void *buf, uint32_t *value) {
   if (IS_LITTLE_ENDIAN()) {
     memcpy(value, buf, sizeof(*value));
   } else {
-    ((char *)value)[3] = ((char *)buf)[0];
-    ((char *)value)[2] = ((char *)buf)[1];
-    ((char *)value)[1] = ((char *)buf)[2];
-    ((char *)value)[0] = ((char *)buf)[3];
+    ((uint8_t *)value)[3] = ((uint8_t *)buf)[0];
+    ((uint8_t *)value)[2] = ((uint8_t *)buf)[1];
+    ((uint8_t *)value)[1] = ((uint8_t *)buf)[2];
+    ((uint8_t *)value)[0] = ((uint8_t *)buf)[3];
   }
 
-  return POINTER_DRIFT(buf, sizeof(*value));
+  return POINTER_SHIFT(buf, sizeof(*value));
 }
 
 static FORCE_INLINE void *taosDecodeFixed64(void *buf, uint64_t *value) {
   if (IS_LITTLE_ENDIAN()) {
     memcpy(value, buf, sizeof(*value));
   } else {
-    ((char *)value)[7] = ((char *)buf)[0];
-    ((char *)value)[6] = ((char *)buf)[1];
-    ((char *)value)[5] = ((char *)buf)[2];
-    ((char *)value)[4] = ((char *)buf)[3];
-    ((char *)value)[3] = ((char *)buf)[4];
-    ((char *)value)[2] = ((char *)buf)[5];
-    ((char *)value)[1] = ((char *)buf)[6];
-    ((char *)value)[0] = ((char *)buf)[7];
+    ((uint8_t *)value)[7] = ((uint8_t *)buf)[0];
+    ((uint8_t *)value)[6] = ((uint8_t *)buf)[1];
+    ((uint8_t *)value)[5] = ((uint8_t *)buf)[2];
+    ((uint8_t *)value)[4] = ((uint8_t *)buf)[3];
+    ((uint8_t *)value)[3] = ((uint8_t *)buf)[4];
+    ((uint8_t *)value)[2] = ((uint8_t *)buf)[5];
+    ((uint8_t *)value)[1] = ((uint8_t *)buf)[6];
+    ((uint8_t *)value)[0] = ((uint8_t *)buf)[7];
   }
 
-  return POINTER_DRIFT(buf, sizeof(*value));
+  return POINTER_SHIFT(buf, sizeof(*value));
+}
+
+static FORCE_INLINE void *taosEncodeVariant16(void *buf, uint16_t value) {
+  int i = 0;
+  while (value >= ENCODE_LIMIT) {
+    ((uint8_t *)buf)[i] = (value | ENCODE_LIMIT);
+    value >>= 7;
+    i++;
+    ASSERT(i < 3);
+  }
+
+  ((uint8_t *)buf)[i] = value;
+
+  return POINTER_SHIFT(buf, i+1);
+}
+
+static FORCE_INLINE void *taosEncodeVariant32(void *buf, uint32_t value) {
+  int i = 0;
+  while (value >= ENCODE_LIMIT) {
+    ((uint8_t *)buf)[i] = (value | ENCODE_LIMIT);
+    value >>= 7;
+    i++;
+    ASSERT(i < 5);
+  }
+
+  ((uint8_t *)buf)[i] = value;
+
+  return POINTER_SHIFT(buf, i + 1);
+}
+
+static FORCE_INLINE void *taosEncodeVariant64(void *buf, uint64_t value) {
+  int i = 0;
+  while (value >= ENCODE_LIMIT) {
+    ((uint8_t *)buf)[i] = (value | ENCODE_LIMIT);
+    value >>= 7;
+    i++;
+    ASSERT(i < 10);
+  }
+
+  ((uint8_t *)buf)[i] = value;
+
+  return POINTER_SHIFT(buf, i + 1);
+}
+
+static FORCE_INLINE void *taosDecodeVariant16(void *buf, uint16_t *value) {
+  int i = 0;
+  *value = 0;
+  while (i < 3 && ) {
+    (*value) |= (((uint8_t *)buf)[i] << (7 * i));
+    i++;
+  }
+
+  return NULL; // error happened
 }
 
-// TODO
-static FORCE_INLINE void *taosEncodeVariant16(void *buf, uint16_t value) {}
-static FORCE_INLINE void *taosEncodeVariant32(void *buf, uint32_t value) {}
-static FORCE_INLINE void *taosEncodeVariant64(void *buf, uint64_t value) {}
-static FORCE_INLINE void *taosDecodeVariant16(void *buf, uint16_t *value) {}
 static FORCE_INLINE void *taosDecodeVariant32(void *buf, uint32_t *value) {}
 static FORCE_INLINE void *taosDecodeVariant64(void *buf, uint64_t *value) {}
 
diff --git a/src/util/inc/tutil.h b/src/util/inc/tutil.h
index b03e0a1c5b5cb72a7741cae4b233c16db6c6bebf..95289048820e67cf3b583ec50255be04931d45f5 100644
--- a/src/util/inc/tutil.h
+++ b/src/util/inc/tutil.h
@@ -45,7 +45,7 @@ extern "C" {
 #define tclose(x) taosCloseSocket(x)
 
 // Pointer p drift right by b bytes
-#define POINTER_DRIFT(p, b) ((void *)((char *)(p) + (b)))
+#define POINTER_SHIFT(p, b) ((void *)((char *)(p) + (b)))
 
 #ifndef NDEBUG
 #define ASSERT(x) assert(x)