diff --git a/source/libs/function/inc/tudf.h b/source/libs/function/inc/tudf.h
index 45e4b2a0f5..683274f3ae 100644
--- a/source/libs/function/inc/tudf.h
+++ b/source/libs/function/inc/tudf.h
@@ -20,6 +20,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "tmsg.h"
+#include "tcommon.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -97,18 +98,20 @@ typedef struct SUdfInterBuf {
   char* buf;
 } SUdfInterBuf;
 
+//TODO: translate these calls to callUdf
+int32_t callUdfAggInit(SUdfInterBuf *interBuf);
 // input: block, initFirst
 // output: interbuf
-int32_t callUdfAggProcess(SUdfDataBlock *block, SUdfInterBuf *interBuf, bool initFirst);
+int32_t callUdfAggProcess(SSDataBlock *block, SUdfInterBuf *interBuf);
 // input: interBuf
 // output: resultData
-int32_t callUdfAggFinalize(SUdfInterBuf *interBuf, SUdfColumnData *resultData);
+int32_t callUdfAggFinalize(SUdfInterBuf *interBuf, SSDataBlock *resultData);
 // input: interbuf1, interbuf2
 // output: resultBuf
 int32_t callUdfAggMerge(SUdfInterBuf *interBuf1, SUdfInterBuf *interBuf2, SUdfInterBuf *resultBuf);
 // input: block
 // output: resultData
-int32_t callUdfScalaProcess(SUdfDataBlock *block, SUdfColumnData *resultData);
+int32_t callUdfScalaProcess(SSDataBlock *block, SSDataBlock *resultData);
 
 /**
  * tearn down udf
@@ -125,6 +128,7 @@ int32_t teardownUdf(UdfHandle handle);
 typedef int32_t (*TUdfSetupFunc)();
 typedef int32_t (*TUdfTeardownFunc)();
 
+//TODO: add API to check function arguments type, number etc.
 //TODO: another way to manage memory is provide api for UDF to add data to SUdfColumnData and UDF framework will allocate memory.
 // then UDF framework will free the memory
 //typedef int32_t addFixedLengthColumnData(SColumnData *columnData, int rowIndex, bool isNull, int32_t colBytes, char* data);
diff --git a/source/libs/function/inc/tudfInt.h b/source/libs/function/inc/tudfInt.h
index 7890eef8be..6c3da8cd89 100644
--- a/source/libs/function/inc/tudfInt.h
+++ b/source/libs/function/inc/tudfInt.h
@@ -30,9 +30,10 @@ enum {
 };
 
 enum {
-  TSDB_UDF_CALL_AGG_PROC = 0,
+  TSDB_UDF_CALL_AGG_INIT = 0,
+  TSDB_UDF_CALL_AGG_PROC,
   TSDB_UDF_CALL_AGG_MERGE,
-  TSDb_UDF_CALL_AGG_FIN,
+  TSDB_UDF_CALL_AGG_FIN,
   TSDB_UDF_CALL_SCALA_PROC,
 };
 
@@ -49,14 +50,15 @@ typedef struct SUdfCallRequest {
   int64_t udfHandle;
   int8_t callType;
 
-  SUdfDataBlock block;
+  SSDataBlock block;
   SUdfInterBuf interBuf;
   SUdfInterBuf interBuf2;
-  bool initFirst;
+  int8_t initFirst;
 } SUdfCallRequest;
 
 typedef struct SUdfCallResponse {
-  SUdfColumnData resultData;
+  int8_t callType;
+  SSDataBlock resultData;
   SUdfInterBuf interBuf;
 } SUdfCallResponse;
 
@@ -94,10 +96,11 @@ typedef struct SUdfResponse {
   };
 } SUdfResponse;
 
-int32_t decodeRequest(char *buf, int32_t bufLen, SUdfRequest *pRequest);
-int32_t encodeRequest(char **buf, int32_t *bufLen, SUdfRequest *request);
-int32_t decodeResponse(char *buf, int32_t bufLen, SUdfResponse *pResponse);
-int32_t encodeResponse(char **buf, int32_t *bufLen, SUdfResponse *response);
+int32_t encodeUdfRequest(void **buf, const SUdfRequest* request);
+void* decodeUdfRequest(const void *buf, SUdfRequest* request);
+
+int32_t encodeUdfResponse(void **buf, const SUdfResponse *response);
+void* decodeUdfResponse(const void* buf, SUdfResponse *response);
 
 void freeUdfColumnData(SUdfColumnData *data);
 void freeUdfColumn(SUdfColumn* col);
diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index 283dfd06bb..c8601c69c8 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -213,507 +213,241 @@ QUEUE gUdfTaskQueue = {0};
 
 QUEUE gUvProcTaskQueue = {0};
 
-int32_t serializeUdfColumnData(SUdfColumnData* data, char* pBuf) {
-  char* bufBeg = pBuf;
-  *(int32_t*)pBuf = data->numOfRows;
-  pBuf += sizeof(int32_t);
-  *(bool*)pBuf = data->varLengthColumn;
-  pBuf += sizeof(bool);
+int32_t encodeUdfSetupRequest(void **buf, const SUdfSetupRequest *setup) {
+  int32_t len = 0;
+  len += taosEncodeBinary(buf, setup->udfName, TSDB_FUNC_NAME_LEN);
+  len += taosEncodeSEpSet(buf, &setup->epSet);
+  return len;
+}
 
-  if (!data->varLengthColumn) {
-    *(int32_t*)pBuf = data->nullBitmapLen;
-    pBuf += sizeof(int32_t);
-    memcpy(pBuf, data->nullBitmap, data->nullBitmapLen);
-    pBuf += data->nullBitmapLen;
-    *(int32_t*)pBuf = data->dataLen;
-    pBuf += sizeof(int32_t);
-    memcpy(pBuf, data->data, data->dataLen);
-    pBuf += data->dataLen;
+void* decodeUdfSetupRequest(const void* buf, SUdfSetupRequest *request) {
+  buf = taosDecodeBinaryTo(buf, request->udfName, TSDB_FUNC_NAME_LEN);
+  buf = taosDecodeSEpSet((void*)buf, &request->epSet);
+  return (void*)buf;
+}
+
+int32_t encodeUdfInterBuf(void **buf, const SUdfInterBuf* state) {
+  int32_t len = 0;
+  len += taosEncodeFixedI32(buf, state->bufLen);
+  len += taosEncodeBinary(buf, state->buf, state->bufLen);
+  return len;
+}
+
+void* decodeUdfInterBuf(const void* buf, SUdfInterBuf* state) {
+  buf = taosDecodeFixedI32(buf, &state->bufLen);
+  buf = taosDecodeBinary(buf, (void**)&state->buf, state->bufLen);
+  return (void*)buf;
+}
+
+int32_t encodeUdfCallRequest(void **buf, const SUdfCallRequest *call) {
+  int32_t len = 0;
+  len += taosEncodeFixedI64(buf, call->udfHandle);
+  len += taosEncodeFixedI8(buf, call->callType);
+  if (call->callType == TSDB_UDF_CALL_SCALA_PROC) {
+    len += tEncodeDataBlock(buf, &call->block);
+  } else if (call->callType == TSDB_UDF_CALL_AGG_INIT) {
+    len += taosEncodeFixedI8(buf, call->initFirst);
+  } else if (call->callType == TSDB_UDF_CALL_AGG_PROC) {
+    len += tEncodeDataBlock(buf, &call->block);
+    len += encodeUdfInterBuf(buf, &call->interBuf);
+  } else if (call->callType == TSDB_UDF_CALL_AGG_MERGE) {
+    len += encodeUdfInterBuf(buf, &call->interBuf);
+    len += encodeUdfInterBuf(buf, &call->interBuf2);
+  } else if (call->callType == TSDB_UDF_CALL_AGG_FIN) {
+    len += encodeUdfInterBuf(buf, &call->interBuf);
+  }
+  return len;
+}
+
+void* decodeUdfCallRequest(const void* buf, SUdfCallRequest* call) {
+  buf = taosDecodeFixedI64(buf, &call->udfHandle);
+  buf = taosDecodeFixedI8(buf, &call->callType);
+  switch (call->callType) {
+    case TSDB_UDF_CALL_SCALA_PROC:
+      buf = tDecodeDataBlock(buf, &call->block);
+      break;
+    case TSDB_UDF_CALL_AGG_INIT:
+      buf = taosDecodeFixedI8(buf, &call->initFirst);
+      break;
+    case TSDB_UDF_CALL_AGG_PROC:
+      buf = tDecodeDataBlock(buf, &call->block);
+      buf = decodeUdfInterBuf(buf, &call->interBuf);
+      break;
+    case TSDB_UDF_CALL_AGG_MERGE:
+      buf = decodeUdfInterBuf(buf, &call->interBuf);
+      buf = decodeUdfInterBuf(buf, &call->interBuf2);
+      break;
+    case TSDB_UDF_CALL_AGG_FIN:
+      buf = decodeUdfInterBuf(buf, &call->interBuf);
+      break;
+  }
+  return (void*)buf;
+}
+
+int32_t encodeUdfTeardownRequest(void **buf, const SUdfTeardownRequest *teardown) {
+  int32_t len = 0;
+  len += taosEncodeFixedI64(buf, teardown->udfHandle);
+  return len;
+}
+
+void* decodeUdfTeardownRequest(const void* buf, SUdfTeardownRequest *teardown) {
+  buf = taosDecodeFixedI64(buf, &teardown->udfHandle);
+  return (void*)buf;
+}
+
+int32_t encodeUdfRequest(void** buf, const SUdfRequest* request) {
+  int32_t len = 0;
+  if (buf == NULL) {
+    len += sizeof(request->msgLen);
   } else {
-    *(int32_t*)pBuf = data->varOffsetsLen;
-    pBuf += sizeof(int32_t);
-    memcpy(pBuf, data->varOffsets, data->varOffsetsLen);
-    pBuf += data->varOffsetsLen;
-    *(int32_t*)pBuf = data->payloadLen;
-    pBuf += sizeof(int32_t);
-    memcpy(pBuf, data->payload, data->payloadLen);
-    pBuf += data->payloadLen;
+    *(int32_t*)(*buf) = request->msgLen;
+    *buf = POINTER_SHIFT(*buf, sizeof(request->msgLen));
   }
-  int32_t len = pBuf - bufBeg;
-  return len;
-}
-
-int32_t deserializeUdfColumnData(SUdfColumnData* pData, char* buf) {
-  char* bufBeg = buf;
-  pData->numOfRows = *(int32_t*)buf;
-  buf += sizeof(int32_t);
-  pData->varLengthColumn = *(bool*)buf;
-  buf += sizeof(bool);
-
-  if (!pData->varLengthColumn) {
-    pData->nullBitmapLen = *(int32_t*)buf;
-    buf += sizeof(int32_t);
-
-    //TODO: optimize for less memory copy
-    pData->nullBitmap = taosMemoryMalloc(pData->nullBitmapLen);
-    memcpy(pData->nullBitmap, buf, pData->nullBitmapLen);
-    buf += pData->nullBitmapLen;
-
-    pData->dataLen = *(int32_t*)buf;
-    buf += sizeof(int32_t);
-
-    pData->data = taosMemoryMalloc(pData->dataLen);
-    memcpy(pData->data, buf, pData->dataLen);
-    buf += pData->dataLen;
-  } else {
-    pData->varOffsetsLen = *(int32_t*)buf;
-    buf += sizeof(int32_t);
-
-    pData->varOffsets = taosMemoryMalloc(pData->varOffsetsLen);
-    memcpy(pData->varOffsets, buf, pData->varOffsetsLen);
-    buf += pData->varOffsetsLen;
-
-    pData->payloadLen = *(int32_t*)buf;
-    buf += sizeof(int32_t);
-
-    pData->payload = taosMemoryMalloc(pData->payloadLen);
-    memcpy(pData->payload, buf, pData->payloadLen);
-    buf += pData->payloadLen;
-  }
-  int32_t len = buf - bufBeg;
-  return len;
-}
-
-int32_t serializeUdfColumnMeta(SUdfColumnMeta *meta, char* pBuf) {
-  char* bufBeg = pBuf;
-  memcpy(pBuf, meta, sizeof(SUdfColumnMeta));
-  pBuf += sizeof(SUdfColumnMeta);
-
-  int32_t len = pBuf - bufBeg;
-  return len;
-}
-
-int32_t deserializeUdfColumnMeta(SUdfColumnMeta *pMeta, char* buf) {
-  char *bufBegin = buf;
-  memcpy(pMeta, buf, sizeof(SUdfColumnMeta));
-  buf += sizeof(SUdfColumnMeta);
-
-  int32_t len = buf - bufBegin;
-  return len;
-}
-
-int32_t serializeUdfColumn(SUdfColumn *udfCol, char *pBuf) {
-  char *bufBegin = pBuf;
-
-  int32_t len = serializeUdfColumnMeta(&udfCol->colMeta, pBuf);
-  pBuf += len;
-
-  len = serializeUdfColumnData(&udfCol->colData, pBuf);
-  pBuf += len;
-
-  int32_t totalLen = pBuf - bufBegin;
-  return totalLen;
-}
-
-int32_t deserializeUdfColumn(SUdfColumn *pUdfCol, char *buf) {
-  char *bufBegin = buf;
-
-  int32_t len = deserializeUdfColumnMeta(&pUdfCol->colMeta, buf);
-  buf += len;
-
-  len = deserializeUdfColumnData(&pUdfCol->colData, buf);
-  buf += len;
-
-  int32_t totalLen = buf - bufBegin;
-  return totalLen;
-}
-
-int32_t serializeUdfDataBlock(SUdfDataBlock *block, char *pBuf) {
-  char *bufBegin = pBuf;
-
-  *(int32_t*)pBuf = block->numOfRows;
-  pBuf += sizeof(int32_t);
-
-  *(int32_t*)pBuf = block->numOfCols;
-  pBuf += sizeof(int32_t);
-
-  for (int32_t i = 0; i < block->numOfCols; ++i) {
-    SUdfColumn* col = block->udfCols[i];
-    int32_t l = serializeUdfColumn(col, pBuf);
-    pBuf += l;
-  }
-
-  int32_t totalLen = pBuf - bufBegin;
-  return totalLen;
-}
-
-int32_t deserializeUdfDataBlock(SUdfDataBlock *pBlock, char *buf) {
-  char *bufBegin = buf;
-
-  pBlock->numOfRows = *(int32_t*)buf;
-  buf += sizeof(int32_t);
-
-  pBlock->numOfCols = *(int32_t*)buf;
-  buf += sizeof(int32_t);
-
-  pBlock->udfCols = taosMemoryMalloc(sizeof(SUdfColumn*) * pBlock->numOfCols);
-  for (int32_t i = 0; i < pBlock->numOfCols; ++i) {
-    pBlock->udfCols[i] = taosMemoryMalloc(sizeof(SUdfColumn));
-    int32_t l = deserializeUdfColumn(pBlock->udfCols[i], buf);
-    buf += l;
-  }
-
-  int32_t totalLen = buf - bufBegin;
-  return totalLen;
-}
-
-int32_t serializeUdfInterBuf(SUdfInterBuf *state, char *pBuf) {
-  char *bufBegin = pBuf;
-
-  *(int32_t*)pBuf = state->bufLen;
-  pBuf += sizeof(int32_t);
-  memcpy(pBuf, state->buf, state->bufLen);
-  pBuf += state->bufLen;
-
-  return pBuf - bufBegin;
-}
-
-int32_t deserializeUdfInterBuf(SUdfInterBuf *pState, char *buf) {
-  char* bufBegin = buf;
-  pState->bufLen = *(int32_t*)buf;
-  buf += sizeof(int32_t);
-
-  pState->buf = taosMemoryMalloc(pState->bufLen);
-  memcpy(pState->buf, buf, pState->bufLen);
-  buf += pState->bufLen;
-  return buf - bufBegin;
-}
-
-int32_t serializeUdfSetupRequest(SUdfSetupRequest *setup, char *buf) {
-  char *bufBegin = buf;
-
-  memcpy(buf, setup->udfName, TSDB_FUNC_NAME_LEN);
-  buf += TSDB_FUNC_NAME_LEN;
-
-  memcpy(buf, &setup->epSet, sizeof(SEpSet));
-  buf += sizeof(SEpSet);
-
-  return buf - bufBegin;
-};
-
-int32_t deserializeUdfSetupRequest(SUdfSetupRequest *setup, char *buf) {
-  char* bufBegin = buf;
-
-  memcpy(setup->udfName, buf, TSDB_FUNC_NAME_LEN);
-  buf += TSDB_FUNC_NAME_LEN;
-
-  memcpy(&setup->epSet, buf, sizeof(SEpSet));
-  buf += sizeof(SEpSet);
-  return buf - bufBegin;
-}
-
-int32_t serializeUdfTeardownRequest(SUdfTeardownRequest *teardown, char *buf) {
-  char* bufBegin = buf;
-  *(int64_t *) buf = teardown->udfHandle;
-  buf += sizeof(int64_t);
-
-  return buf - bufBegin;
-}
-
-int32_t deserializeUdfTeardownRequest(SUdfTeardownRequest *teardown, char *buf) {
-  char *bufBegin = buf;
-  teardown->udfHandle = *(int64_t *) buf;
-  buf += sizeof(int64_t);
-  return buf - bufBegin;
-}
-
-int32_t serializeUdfSetupResponse(SUdfSetupResponse *setupRsp, char *buf) {
-  char *bufBegin = buf;
-
-  *(int64_t *) buf = setupRsp->udfHandle;
-  buf += sizeof(int64_t);
-
-  return buf-bufBegin;
-}
-
-int32_t deserializeUdfSetupResponse(SUdfSetupResponse *setupRsp, char *buf) {
-  char *bufBegin = buf;
-  setupRsp->udfHandle = *(int64_t *) buf;
-  buf += sizeof(int64_t);
-  return buf-bufBegin;
-}
-
-int32_t serializeUdfTeardownResponse(SUdfTeardownResponse *teardownRsp, char *buf) {
-  return 0;
-}
-
-int32_t deserializeUdfTeardownResponse(SUdfTeardownResponse *teardownRsp, char *buf) {
-  return 0;
-}
-
-int32_t serializeUdfCallRequest(SUdfCallRequest *call, char *buf) {
-  char* bufBegin = buf;
-  *(int64_t *) buf = call->udfHandle;
-  buf += sizeof(int64_t);
-  *(int8_t *) buf = call->callType;
-  buf += sizeof(int8_t);
-  int32_t l = 0;
-  l = serializeUdfDataBlock(&call->block, buf);
-  buf += l;
-  l = serializeUdfInterBuf(&call->interBuf, buf);
-  buf += l;
-  l = serializeUdfInterBuf(&call->interBuf2, buf);
-  buf += l;
-
-  *(bool*)buf = call->initFirst;
-  buf += sizeof(bool);
-
-  return buf - bufBegin;
-}
-
-int32_t deserializeUdfCallRequest(SUdfCallRequest *call, char *buf) {
-  char* bufBegin = buf;
-  call->udfHandle = *(int64_t *) buf;
-  buf += sizeof(int64_t);
-  call->callType = *(int8_t *) buf;
-  buf += sizeof(int8_t);
-  int32_t l = 0;
-  l = deserializeUdfDataBlock(&call->block, buf);
-  buf += l;
-  l = deserializeUdfInterBuf(&call->interBuf, buf);
-  buf += l;
-  call->initFirst = *(bool*)buf;
-  buf += sizeof(bool);
-  return buf - bufBegin;
-}
-
-int32_t serializeUdfCallResponse(SUdfCallResponse *callRsp, char * buf) {
-  char *bufBegin = buf;
-  int32_t l = 0;
-  l = serializeUdfColumnData(&callRsp->resultData, buf);
-  buf += l;
-  l = serializeUdfInterBuf(&callRsp->interBuf, buf);
-  buf += l;
-
-  return buf - bufBegin;
-}
-
-int32_t deserializeUdfCallResponse(SUdfCallResponse *callRsp, char * buf) {
-  char *bufBegin = buf;
-  int32_t l = 0;
-  l =deserializeUdfColumnData(&callRsp->resultData, buf);
-  buf += l;
-  l = deserializeUdfInterBuf(&callRsp->interBuf, buf);
-  buf += l;
-  return buf - bufBegin;
-}
-
-int32_t serializeUdfRequest(SUdfRequest *request, char *buf) {
- char* bufBegin = buf;
- //skip msglen first
- buf += sizeof(int32_t);
-
- *(int64_t *) buf = request->seqNum;
- buf += sizeof(int64_t);
- *(int8_t *) buf = request->type;
- buf += sizeof(int8_t);
-
- int32_t l = 0;
- if (request->type == UDF_TASK_SETUP) {
-   l = serializeUdfSetupRequest(&request->setup, buf);
-   buf += l;
- } else if (request->type == UDF_TASK_CALL) {
-   l = serializeUdfCallRequest(&request->call, buf);
-   buf += l;
- } else if (request->type == UDF_TASK_TEARDOWN){
-   l = serializeUdfTeardownRequest(&request->teardown, buf);
-   buf += l;
- }
- *(int32_t*)bufBegin = buf - bufBegin;
- return buf - bufBegin;
-}
-
-int32_t deserializeUdfRequest(SUdfRequest *request, char *buf) {
-  char* bufBegin = buf;
-  request->msgLen = *(int32_t *) (buf);
-  buf += sizeof(int32_t);
-  request->seqNum = *(int64_t *) (buf);
-  buf += sizeof(int64_t);
-  request->type = *(int8_t *) (buf);
-  buf += sizeof(int8_t);
-
-  int32_t l = 0;
+  len += taosEncodeFixedI64(buf, request->seqNum);
+  len += taosEncodeFixedI8(buf, request->type);
   if (request->type == UDF_TASK_SETUP) {
-    l = deserializeUdfSetupRequest(&request->setup, buf);
-    buf += l;
+    len += encodeUdfSetupRequest(buf, &request->setup);
   } else if (request->type == UDF_TASK_CALL) {
-    l = deserializeUdfCallRequest(&request->call, buf);
-    buf += l;
-  } else if (request->type == UDF_TASK_TEARDOWN){
-    l = deserializeUdfTeardownRequest(&request->teardown, buf);
-    buf += l;
+    len += encodeUdfCallRequest(buf, &request->call);
+  } else if (request->type == UDF_TASK_TEARDOWN) {
+    len += encodeUdfTeardownRequest(buf, &request->teardown);
   }
-  int32_t totalLen = buf-bufBegin;
-  if (totalLen != request->msgLen) {
-    debugPrint("decoding request error");
-    return -1;
-  }
-  return buf - bufBegin;
+  return len;
 }
 
-int32_t serializeUdfResponse(SUdfResponse *response, char *buf) {
-  char* bufBegin = buf;
-  //skip msgLen
-  buf += sizeof(int32_t);
+void* decodeUdfRequest(const void* buf, SUdfRequest* request) {
+  request->msgLen = *(int32_t*)(buf);
+  POINTER_SHIFT(buf, sizeof(request->msgLen));
 
-  *(int64_t *) buf = response->seqNum;
-  buf += sizeof(int64_t);
-  *(int8_t *) buf = response->type;
-  buf += sizeof(int8_t);
-  *(int32_t *) buf = response->code;
-  buf += sizeof(int32_t);
-  int32_t l = 0;
-  switch (response->type) {
-    case UDF_TASK_SETUP: {
-      l = serializeUdfSetupResponse(&response->setupRsp, buf);
-      buf += l;
-      break;
-    }
-    case UDF_TASK_CALL: {
-      l = serializeUdfCallResponse(&response->callRsp, buf);
-      buf += l;
-      break;
-    }
-    case UDF_TASK_TEARDOWN: {
-      l = serializeUdfTeardownResponse(&response->teardownRsp, buf);
-      buf += l;
-    }
+  buf = taosDecodeFixedI64(buf, &request->seqNum);
+  buf = taosDecodeFixedI8(buf, &request->type);
+
+  if (request->type == UDF_TASK_SETUP) {
+    buf = decodeUdfSetupRequest(buf, &request->setup);
+  } else if (request->type == UDF_TASK_CALL) {
+    buf = decodeUdfCallRequest(buf, &request->call);
+  } else if (request->type == UDF_TASK_TEARDOWN) {
+    buf = decodeUdfTeardownRequest(buf, &request->teardown);
   }
-
-  *(int32_t*)bufBegin = buf - bufBegin;
-  return buf - bufBegin;
+  return (void*)buf;
 }
 
-int32_t deserializeUdfResponse(SUdfResponse *rsp, char *buf) {
-  char* bufBegin = buf;
-  rsp->msgLen = *(int32_t *) buf;
-  buf += sizeof(int32_t);
-  rsp->seqNum = *(int64_t *) buf;
-  buf += sizeof(int64_t);
-  rsp->type = *(int8_t *) buf;
-  buf += sizeof(int8_t);
-  rsp->code = *(int32_t *) buf;
-  buf += sizeof(int32_t);
-  int32_t l = 0;
+int32_t encodeUdfSetupResponse(void **buf, const SUdfSetupResponse *setupRsp) {
+  int32_t len = 0;
+  len += taosEncodeFixedI64(buf, setupRsp->udfHandle);
+  return len;
+}
+
+void* decodeUdfSetupResponse(const void* buf, SUdfSetupResponse* setupRsp) {
+  buf = taosDecodeFixedI64(buf, &setupRsp->udfHandle);
+  return (void*)buf;
+}
+
+int32_t encodeUdfCallResponse(void **buf, const SUdfCallResponse *callRsp) {
+  int32_t len = 0;
+  len += taosEncodeFixedI8(buf, callRsp->callType);
+  switch (callRsp->callType) {
+    case TSDB_UDF_CALL_SCALA_PROC:
+      len += tEncodeDataBlock(buf, &callRsp->resultData);
+      break;
+    case TSDB_UDF_CALL_AGG_INIT:
+      len += encodeUdfInterBuf(buf, &callRsp->interBuf);
+      break;
+    case TSDB_UDF_CALL_AGG_PROC:
+      len += encodeUdfInterBuf(buf, &callRsp->interBuf);
+      break;
+    case TSDB_UDF_CALL_AGG_MERGE:
+      len += encodeUdfInterBuf(buf, &callRsp->interBuf);
+      break;
+    case TSDB_UDF_CALL_AGG_FIN:
+      len += tEncodeDataBlock(buf, &callRsp->resultData);
+      break;
+  }
+  return len;
+}
+
+void* decodeUdfCallResponse(const void* buf, SUdfCallResponse* callRsp) {
+  buf = taosDecodeFixedI8(buf, &callRsp->callType);
+  switch (callRsp->callType) {
+    case TSDB_UDF_CALL_SCALA_PROC:
+      buf = tDecodeDataBlock(buf, &callRsp->resultData);
+      break;
+    case TSDB_UDF_CALL_AGG_INIT:
+      buf = decodeUdfInterBuf(buf, &callRsp->interBuf);
+      break;
+    case TSDB_UDF_CALL_AGG_PROC:
+      buf = decodeUdfInterBuf(buf, &callRsp->interBuf);
+      break;
+    case TSDB_UDF_CALL_AGG_MERGE:
+      buf = decodeUdfInterBuf(buf, &callRsp->interBuf);
+      break;
+    case TSDB_UDF_CALL_AGG_FIN:
+      buf = tDecodeDataBlock(buf, &callRsp->resultData);
+      break;
+  }
+  return (void*)buf;
+}
+
+int32_t encodeUdfTeardownResponse(void** buf, const SUdfTeardownResponse* teardownRsp) {
+  return 0;
+}
+
+void* decodeUdfTeardownResponse(const void* buf, SUdfTeardownResponse* teardownResponse) {
+  return (void*)buf;
+}
+
+int32_t encodeUdfResponse(void** buf, const SUdfResponse* rsp) {
+  int32_t len = 0;
+  if (buf == NULL) {
+    len += sizeof(rsp->msgLen);
+  } else {
+    *(int32_t*)(*buf) = rsp->msgLen;
+    *buf = POINTER_SHIFT(*buf, sizeof(rsp->msgLen));
+  }
+
+  len += taosEncodeFixedI64(buf, rsp->seqNum);
+  len += taosEncodeFixedI8(buf, rsp->type);
+  len += taosEncodeFixedI32(buf, rsp->code);
+
   switch (rsp->type) {
-    case UDF_TASK_SETUP: {
-      l = deserializeUdfSetupResponse(&rsp->setupRsp, buf);
-      buf += l;
+    case UDF_TASK_SETUP:
+      len += encodeUdfSetupResponse(buf, &rsp->setupRsp);
       break;
-    }
-    case UDF_TASK_CALL: {
-      l = deserializeUdfCallResponse(&rsp->callRsp, buf);
-      buf += l;
+    case UDF_TASK_CALL:
+      len += encodeUdfCallResponse(buf, &rsp->callRsp);
+      break;
+    case UDF_TASK_TEARDOWN:
+      len += encodeUdfTeardownResponse(buf, &rsp->teardownRsp);
+      break;
+    default:
+      //TODO: log error
       break;
-    }
-    case UDF_TASK_TEARDOWN: {
-      l = deserializeUdfTeardownResponse(&rsp->teardownRsp, buf);
-      buf += l;
-    }
   }
-  int32_t total = buf - bufBegin;
-  if (total != rsp->msgLen) {
-      debugPrint("decode response error");
-      return -1;
-    }
-  return buf - bufBegin;
+  return len;
 }
 
-int32_t estimateUdfRequestLen(SUdfRequest *request) {
-  // a larger estimated is generated
-  int32_t size = sizeof(SUdfRequest);
-  if (request->type == UDF_TASK_CALL) {
-    size += request->call.block.numOfCols * sizeof(SUdfColumn*);
-    for (int32_t i = 0; i < request->call.block.numOfCols; ++i) {
-      size += sizeof(SUdfColumn);
-      SUdfColumn* col = request->call.block.udfCols[i];
-      if (col->colData.varLengthColumn) {
-        size += col->colData.varOffsetsLen;
-        size += col->colData.payloadLen;
-      } else {
-        size += col->colData.nullBitmapLen;
-        size += col->colData.dataLen;
-      }
-    }
-    size += request->call.interBuf.bufLen;
+void* decodeUdfResponse(const void* buf, SUdfResponse* rsp) {
+  rsp->msgLen = *(int32_t*)(buf);
+  POINTER_SHIFT(buf, sizeof(rsp->msgLen));
+  buf = taosDecodeFixedI64(buf, &rsp->seqNum);
+  buf = taosDecodeFixedI8(buf, &rsp->type);
+  buf = taosDecodeFixedI32(buf, &rsp->code);
+
+  switch (rsp->type) {
+    case UDF_TASK_SETUP:
+      buf = decodeUdfSetupResponse(buf, &rsp->setupRsp);
+      break;
+    case UDF_TASK_CALL:
+      buf = decodeUdfCallResponse(buf, &rsp->callRsp);
+      break;
+    case UDF_TASK_TEARDOWN:
+      buf = decodeUdfTeardownResponse(buf, &rsp->teardownRsp);
+      break;
+    default:
+      //TODO: log error
+      break;
   }
-  return size;
-}
-
-int32_t estimateUdfResponseLen(SUdfResponse *response) {
-  int32_t size = sizeof(SUdfResponse);
-  if (response->type == UDF_TASK_CALL) {
-    size += response->callRsp.interBuf.bufLen;
-    SUdfColumnData *resultData = &response->callRsp.resultData;
-    if (!resultData->varLengthColumn) {
-      size += resultData->nullBitmapLen;
-      size += resultData->dataLen;
-    } else {
-      size += resultData->varOffsetsLen;
-      size += resultData->payloadLen;
-    }
-  }
-
-  return size;
-}
-
-int32_t encodeRequest(char **pBuf, int32_t *pBufLen, SUdfRequest *request) {
-  debugPrint("%s", "encoding request");
-
-  int len = estimateUdfRequestLen(request);
-
-  char *bufBegin = taosMemoryMalloc(len);
-  char *buf = bufBegin;
-  serializeUdfRequest(request, buf);
-  *pBuf = bufBegin;
-  *pBufLen = request->msgLen;
-  debugPrint("\tLen: estimate: %d, actual:%d", len, *pBufLen);
-  return 0;
-}
-
-int32_t decodeRequest(char *bufMsg, int32_t bufLen, SUdfRequest *pRequest) {
-  debugPrint("%s", "decoding request");
-  if (*(int32_t *) bufMsg != bufLen) {
-    debugPrint("%s", "decoding request error");
-    return -1;
-  }
-  char *buf = bufMsg;
-  deserializeUdfRequest(pRequest, buf);
-  return 0;
-}
-
-int32_t encodeResponse(char **pBuf, int32_t *pBufLen, SUdfResponse *response) {
-  debugPrint("%s", "encoding response");
-  int32_t len = estimateUdfResponseLen(response);
-
-  char *bufBegin = taosMemoryMalloc(len);
-  char *buf = bufBegin;
-  serializeUdfResponse(response, buf);
-  *pBuf = bufBegin;
-  *pBufLen = response->msgLen;
-  return 0;
-}
-
-int32_t decodeResponse(char *bufMsg, int32_t bufLen, SUdfResponse *rsp) {
-  debugPrint("%s", "decoding response");
-
-  if (*(int32_t *) bufMsg != bufLen) {
-    debugPrint("%s", "can not decode response");
-    return -1;
-  }
-  char *buf = bufMsg;
-  deserializeUdfResponse(rsp, buf);
-  return 0;
+  return (void*)buf;
 }
 
 void freeUdfColumnData(SUdfColumnData *data) {
@@ -770,7 +504,8 @@ int32_t udfcGetUvTaskResponseResult(SClientUdfTask *task, SClientUvTaskNode *uvT
   if (uvTask->type == UV_TASK_REQ_RSP) {
     if (uvTask->rspBuf.base != NULL) {
       SUdfResponse rsp;
-      decodeResponse(uvTask->rspBuf.base, uvTask->rspBuf.len, &rsp);
+      void* buf = decodeUdfResponse(uvTask->rspBuf.base, &rsp);
+      assert(uvTask->rspBuf.len == POINTER_DISTANCE(buf, uvTask->rspBuf.base));
       task->errCode = rsp.code;
 
       switch (task->type) {
@@ -973,9 +708,10 @@ int32_t createUdfcUvTask(SClientUdfTask *task, int8_t uvTaskType, SClientUvTaskN
     } else {
       //TODO log and return error
     }
-    char *buf = NULL;
-    int32_t bufLen = 0;
-    encodeRequest(&buf, &bufLen, &request);
+    int32_t bufLen = encodeUdfRequest(NULL, &request);
+    request.msgLen = bufLen;
+    void *buf = taosMemoryMalloc(bufLen);
+    encodeUdfRequest(&buf, &request);
     uvTask->reqBuf = uv_buf_init(buf, bufLen);
     uvTask->seqNum = request.seqNum;
   } else if (uvTaskType == UV_TASK_DISCONNECT) {
@@ -1226,8 +962,8 @@ int32_t setupUdf(char udfName[], SEpSet *epSet, UdfHandle *handle) {
   return err;
 }
 
-int32_t callUdf(UdfHandle handle, int8_t callType, SUdfDataBlock *input, SUdfInterBuf *state,
-                SUdfColumnData* output, SUdfInterBuf *newState, bool initFirst) {
+int32_t callUdf(UdfHandle handle, int8_t callType, int8_t initFirst, SSDataBlock *input, SUdfInterBuf *state, SUdfInterBuf *state2,
+                SSDataBlock* output, SUdfInterBuf *newState) {
   debugPrint("%s", "client call udf");
 
   SClientUdfTask *task = taosMemoryMalloc(sizeof(SClientUdfTask));
@@ -1237,14 +973,21 @@ int32_t callUdf(UdfHandle handle, int8_t callType, SUdfDataBlock *input, SUdfInt
 
   SUdfCallRequest *req = &task->_call.req;
   switch (callType) {
+    case TSDB_UDF_CALL_AGG_INIT: {
+      req->initFirst = 1;
+      break;
+    }
     case TSDB_UDF_CALL_AGG_PROC: {
       req->block = *input;
       req->interBuf = *state;
-      req->initFirst = initFirst;
       break;
     }
-
-    case TSDb_UDF_CALL_AGG_FIN: {
+    case TSDB_UDF_CALL_AGG_MERGE: {
+      req->interBuf = *state;
+      req->interBuf2 = *state2;
+      break;
+    }
+    case TSDB_UDF_CALL_AGG_FIN: {
       req->interBuf = *state;
       break;
     }
@@ -1258,12 +1001,19 @@ int32_t callUdf(UdfHandle handle, int8_t callType, SUdfDataBlock *input, SUdfInt
 
   SUdfCallResponse *rsp = &task->_call.rsp;
   switch (callType) {
+    case TSDB_UDF_CALL_AGG_INIT: {
+      *newState = rsp->interBuf;
+      break;
+    }
     case TSDB_UDF_CALL_AGG_PROC: {
       *newState = rsp->interBuf;
       break;
     }
-
-    case TSDb_UDF_CALL_AGG_FIN: {
+    case TSDB_UDF_CALL_AGG_MERGE: {
+      *newState = rsp->interBuf;
+      break;
+    }
+    case TSDB_UDF_CALL_AGG_FIN: {
       *output = rsp->resultData;
       break;
     }
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index a1996133e7..76c731a473 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -62,7 +62,7 @@ typedef struct SUdfHandle {
 void udfdProcessRequest(uv_work_t *req) {
     SUvUdfWork *uvUdf = (SUvUdfWork *) (req->data);
     SUdfRequest request = {0};
-    decodeRequest(uvUdf->input.base, uvUdf->input.len, &request);
+    decodeUdfRequest(uvUdf->input.base, &request);
 
     switch (request.type) {
         case UDF_TASK_SETUP: {
@@ -94,9 +94,10 @@ void udfdProcessRequest(uv_work_t *req) {
             rsp.type = request.type;
             rsp.code = 0;
             rsp.setupRsp.udfHandle = (int64_t) (handle);
-            char *buf;
-            int32_t len;
-            encodeResponse(&buf, &len, &rsp);
+            int32_t len = encodeUdfResponse(NULL, &rsp);
+            rsp.msgLen = len;
+            void *buf = taosMemoryMalloc(len);
+            encodeUdfResponse(&buf, &rsp);
 
             uvUdf->output = uv_buf_init(buf, len);
 
@@ -110,7 +111,8 @@ void udfdProcessRequest(uv_work_t *req) {
             SUdfHandle *handle = (SUdfHandle *) (call->udfHandle);
             SUdf *udf = handle->udf;
 
-            SUdfDataBlock input = call->block;
+            SUdfDataBlock input = {0};
+            //TODO: convertSDataBlockToUdfDataBlock(call->block, &input);
             SUdfColumnData output;
 	    //TODO: call different functions according to call type, for now just calar
             if (call->callType == TSDB_UDF_CALL_SCALA_PROC) {
@@ -124,12 +126,13 @@ void udfdProcessRequest(uv_work_t *req) {
               rsp->type = request.type;
               rsp->code = 0;
               SUdfCallResponse *subRsp = &rsp->callRsp;
-              subRsp->resultData = output;
+              //TODO: convertSUdfColumnDataToSSDataBlock(output, &subRsp->resultData);
             }
 
-            char *buf;
-            int32_t len;
-            encodeResponse(&buf, &len, rsp);
+            int32_t len = encodeUdfResponse(NULL, rsp);
+            rsp->msgLen = len;
+            void *buf = taosMemoryMalloc(len);
+            encodeUdfResponse(&buf, rsp);
             uvUdf->output = uv_buf_init(buf, len);
 
             //TODO: free
@@ -158,9 +161,10 @@ void udfdProcessRequest(uv_work_t *req) {
             rsp->type = request.type;
             rsp->code = 0;
             SUdfTeardownResponse *subRsp = &response.teardownRsp;
-            char *buf;
-            int32_t len;
-            encodeResponse(&buf, &len, rsp);
+            int32_t len = encodeUdfResponse(NULL, rsp);
+            void *buf = taosMemoryMalloc(len);
+            rsp->msgLen = len;
+            encodeUdfResponse(&buf, rsp);
             uvUdf->output = uv_buf_init(buf, len);
 
             taosMemoryFree(uvUdf->input.base);