diff --git a/source/libs/function/inc/tudf.h b/source/libs/function/inc/tudf.h
index 683274f3ae..db62accb85 100644
--- a/source/libs/function/inc/tudf.h
+++ b/source/libs/function/inc/tudf.h
@@ -99,19 +99,20 @@ typedef struct SUdfInterBuf {
 } SUdfInterBuf;
 
 //TODO: translate these calls to callUdf
-int32_t callUdfAggInit(SUdfInterBuf *interBuf);
-// input: block, initFirst
-// output: interbuf
-int32_t callUdfAggProcess(SSDataBlock *block, SUdfInterBuf *interBuf);
+// output: interBuf
+int32_t callUdfAggInit(UdfHandle handle, SUdfInterBuf *interBuf);
+// input: block, state
+// output: newState
+int32_t callUdfAggProcess(UdfHandle handle, SSDataBlock *block, SUdfInterBuf *state, SUdfInterBuf *newState);
 // input: interBuf
 // output: resultData
-int32_t callUdfAggFinalize(SUdfInterBuf *interBuf, SSDataBlock *resultData);
+int32_t callUdfAggFinalize(UdfHandle handle, SUdfInterBuf *interBuf, SUdfInterBuf *resultData);
 // input: interbuf1, interbuf2
 // output: resultBuf
-int32_t callUdfAggMerge(SUdfInterBuf *interBuf1, SUdfInterBuf *interBuf2, SUdfInterBuf *resultBuf);
+int32_t callUdfAggMerge(UdfHandle handle, SUdfInterBuf *interBuf1, SUdfInterBuf *interBuf2, SUdfInterBuf *resultBuf);
 // input: block
 // output: resultData
-int32_t callUdfScalaProcess(SSDataBlock *block, SSDataBlock *resultData);
+int32_t callUdfScalaProcess(UdfHandle handle, SSDataBlock *block, SSDataBlock *resultData);
 
 /**
  * tearn down udf
@@ -134,12 +135,12 @@ typedef int32_t (*TUdfTeardownFunc)();
 //typedef int32_t addFixedLengthColumnData(SColumnData *columnData, int rowIndex, bool isNull, int32_t colBytes, char* data);
 //typedef int32_t addVariableLengthColumnData(SColumnData *columnData, int rowIndex, bool isNull, int32_t dataLen, char * data);
 
-typedef int32_t (*TUdfFreeUdfColumnDataFunc)(SUdfColumnData* columnData);
+typedef int32_t (*TUdfFreeUdfColumnDataFunc)(SUdfColumn* columnData);
 
-typedef int32_t (*TUdfScalarProcFunc)(SUdfDataBlock block, SUdfColumnData *resultData);
+typedef int32_t (*TUdfScalarProcFunc)(SUdfDataBlock block, SUdfColumn *resultCol);
 typedef int32_t (*TUdfAggInitFunc)(SUdfInterBuf *buf);
 typedef int32_t (*TUdfAggProcessFunc)(SUdfDataBlock block, SUdfInterBuf *interBuf);
-typedef int32_t (*TUdfAggFinalizeFunc)(SUdfInterBuf buf, SUdfColumnData *resultData);
+typedef int32_t (*TUdfAggFinalizeFunc)(SUdfInterBuf buf, SUdfInterBuf *resultData);
 
 
 // end API to UDF writer
diff --git a/source/libs/function/inc/tudfInt.h b/source/libs/function/inc/tudfInt.h
index 6c3da8cd89..496f486e05 100644
--- a/source/libs/function/inc/tudfInt.h
+++ b/source/libs/function/inc/tudfInt.h
@@ -59,7 +59,7 @@ typedef struct SUdfCallRequest {
 typedef struct SUdfCallResponse {
   int8_t callType;
   SSDataBlock resultData;
-  SUdfInterBuf interBuf;
+  SUdfInterBuf resultBuf;
 } SUdfCallResponse;
 
 
@@ -106,6 +106,9 @@ void freeUdfColumnData(SUdfColumnData *data);
 void freeUdfColumn(SUdfColumn* col);
 void freeUdfDataDataBlock(SUdfDataBlock *block);
 
+int32_t convertDataBlockToUdfDataBlock(SSDataBlock *block, SUdfDataBlock *udfBlock);
+int32_t convertUdfColumnToDataBlock(SUdfColumn *udfCol, SSDataBlock *block);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index c8601c69c8..1bc961d527 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -18,6 +18,7 @@
 #include "tudf.h"
 #include "tudfInt.h"
 #include "tarray.h"
+#include "tdatablock.h"
 
 //TODO: when startup, set thread poll size. add it to cfg
 //TODO: test for udfd restart
@@ -351,13 +352,13 @@ int32_t encodeUdfCallResponse(void **buf, const SUdfCallResponse *callRsp) {
       len += tEncodeDataBlock(buf, &callRsp->resultData);
       break;
     case TSDB_UDF_CALL_AGG_INIT:
-      len += encodeUdfInterBuf(buf, &callRsp->interBuf);
+      len += encodeUdfInterBuf(buf, &callRsp->resultBuf);
       break;
     case TSDB_UDF_CALL_AGG_PROC:
-      len += encodeUdfInterBuf(buf, &callRsp->interBuf);
+      len += encodeUdfInterBuf(buf, &callRsp->resultBuf);
       break;
     case TSDB_UDF_CALL_AGG_MERGE:
-      len += encodeUdfInterBuf(buf, &callRsp->interBuf);
+      len += encodeUdfInterBuf(buf, &callRsp->resultBuf);
       break;
     case TSDB_UDF_CALL_AGG_FIN:
       len += tEncodeDataBlock(buf, &callRsp->resultData);
@@ -373,13 +374,13 @@ void* decodeUdfCallResponse(const void* buf, SUdfCallResponse* callRsp) {
       buf = tDecodeDataBlock(buf, &callRsp->resultData);
       break;
     case TSDB_UDF_CALL_AGG_INIT:
-      buf = decodeUdfInterBuf(buf, &callRsp->interBuf);
+      buf = decodeUdfInterBuf(buf, &callRsp->resultBuf);
       break;
     case TSDB_UDF_CALL_AGG_PROC:
-      buf = decodeUdfInterBuf(buf, &callRsp->interBuf);
+      buf = decodeUdfInterBuf(buf, &callRsp->resultBuf);
       break;
     case TSDB_UDF_CALL_AGG_MERGE:
-      buf = decodeUdfInterBuf(buf, &callRsp->interBuf);
+      buf = decodeUdfInterBuf(buf, &callRsp->resultBuf);
       break;
     case TSDB_UDF_CALL_AGG_FIN:
       buf = tDecodeDataBlock(buf, &callRsp->resultData);
@@ -483,6 +484,70 @@ void freeUdfInterBuf(SUdfInterBuf *buf) {
   buf->buf = NULL;
 }
 
+
+int32_t convertDataBlockToUdfDataBlock(SSDataBlock *block, SUdfDataBlock *udfBlock) {
+  udfBlock->numOfRows = block->info.rows;
+  udfBlock->numOfCols = block->info.numOfCols;
+  udfBlock->udfCols = taosMemoryMalloc(sizeof(SUdfColumn*) * udfBlock->numOfCols);
+  for (int32_t i = 0; i < udfBlock->numOfCols; ++i) {
+    udfBlock->udfCols[i] = taosMemoryMalloc(sizeof(SUdfColumn));
+    SColumnInfoData *col= (SColumnInfoData*)taosArrayGet(block->pDataBlock, i);
+    SUdfColumn *udfCol = udfBlock->udfCols[i];
+    udfCol->colMeta.type = col->info.type;
+    udfCol->colMeta.bytes = col->info.bytes;
+    udfCol->colMeta.scale = col->info.scale;
+    udfCol->colMeta.precision = col->info.precision;
+    udfCol->colData.numOfRows = udfBlock->numOfRows;
+    udfCol->colData.varLengthColumn = IS_VAR_DATA_TYPE(udfCol->colMeta.type);
+    if (udfCol->colData.varLengthColumn) {
+      udfCol->colData.varOffsetsLen = sizeof(int32_t) * udfBlock->numOfRows;
+      udfCol->colData.varOffsets = taosMemoryMalloc(udfCol->colData.varOffsetsLen);
+      memcpy(udfCol->colData.varOffsets, col->varmeta.offset, udfCol->colData.varOffsetsLen);
+      udfCol->colData.payloadLen = colDataGetLength(col, udfBlock->numOfRows);
+      udfCol->colData.payload = taosMemoryMalloc(udfCol->colData.payloadLen);
+      memcpy(udfCol->colData.payload, col->pData, udfCol->colData.payloadLen);
+    } else {
+      udfCol->colData.nullBitmapLen = BitmapLen(udfCol->colData.numOfRows);
+      udfCol->colData.nullBitmap = taosMemoryMalloc(udfCol->colData.nullBitmapLen);
+      memcpy(udfCol->colData.nullBitmap, col->nullbitmap, udfCol->colData.nullBitmapLen);
+      udfCol->colData.dataLen = colDataGetLength(col, udfBlock->numOfRows);
+      udfCol->colData.data = taosMemoryMalloc(udfCol->colData.dataLen);
+      memcpy(udfCol->colData.data, col->pData, udfCol->colData.dataLen);
+    }
+  }
+  return 0;
+}
+
+int32_t convertUdfColumnToDataBlock(SUdfColumn *udfCol, SSDataBlock *block) {
+  block->info.numOfCols = 1;
+  block->info.rows = udfCol->colData.numOfRows;
+  block->info.hasVarCol = udfCol->colData.varLengthColumn;
+
+  block->pDataBlock = taosArrayInit(1, sizeof(SColumnInfoData));
+  taosArraySetSize(block->pDataBlock, 1);
+  SColumnInfoData *col = taosArrayGet(block->pDataBlock, 0);
+  SUdfColumnMeta *meta = &udfCol->colMeta;
+  col->info.precision = meta->precision;
+  col->info.bytes = meta->bytes;
+  col->info.scale = meta->scale;
+  col->info.type = meta->type;
+  SUdfColumnData *data = &udfCol->colData;
+
+  if (!IS_VAR_DATA_TYPE(meta->type)) {
+    col->nullbitmap = taosMemoryMalloc(data->nullBitmapLen);
+    memcpy(col->nullbitmap, data->nullBitmap, data->nullBitmapLen);
+    col->pData = taosMemoryMalloc(data->dataLen);
+    memcpy(col->pData, data->payload, data->dataLen);
+  } else {
+    col->varmeta.offset = taosMemoryMalloc(data->varOffsetsLen);
+    memcpy(col->varmeta.offset, data->varOffsets, data->varOffsetsLen);
+    col->pData = taosMemoryMalloc(data->payloadLen);
+    memcpy(col->pData, data->payload, data->payloadLen);
+  }
+  return 0;
+}
+
+
 void onUdfcPipeClose(uv_handle_t *handle) {
   SClientUvConn *conn = handle->data;
   if (!QUEUE_EMPTY(&conn->taskQueue)) {
@@ -962,7 +1027,7 @@ int32_t setupUdf(char udfName[], SEpSet *epSet, UdfHandle *handle) {
   return err;
 }
 
-int32_t callUdf(UdfHandle handle, int8_t callType, int8_t initFirst, SSDataBlock *input, SUdfInterBuf *state, SUdfInterBuf *state2,
+int32_t callUdf(UdfHandle handle, int8_t callType, SSDataBlock *input, SUdfInterBuf *state, SUdfInterBuf *state2,
                 SSDataBlock* output, SUdfInterBuf *newState) {
   debugPrint("%s", "client call udf");
 
@@ -1002,19 +1067,19 @@ int32_t callUdf(UdfHandle handle, int8_t callType, int8_t initFirst, SSDataBlock
   SUdfCallResponse *rsp = &task->_call.rsp;
   switch (callType) {
     case TSDB_UDF_CALL_AGG_INIT: {
-      *newState = rsp->interBuf;
+      *newState = rsp->resultBuf;
       break;
     }
     case TSDB_UDF_CALL_AGG_PROC: {
-      *newState = rsp->interBuf;
+      *newState = rsp->resultBuf;
       break;
     }
     case TSDB_UDF_CALL_AGG_MERGE: {
-      *newState = rsp->interBuf;
+      *newState = rsp->resultBuf;
       break;
     }
     case TSDB_UDF_CALL_AGG_FIN: {
-      *output = rsp->resultData;
+      *newState = rsp->resultBuf;
       break;
     }
     case TSDB_UDF_CALL_SCALA_PROC: {
@@ -1027,6 +1092,47 @@ int32_t callUdf(UdfHandle handle, int8_t callType, int8_t initFirst, SSDataBlock
   return task->errCode;
 }
 
+//TODO: translate these calls to callUdf
+int32_t callUdfAggInit(UdfHandle handle, SUdfInterBuf *interBuf) {
+  int8_t callType = TSDB_UDF_CALL_AGG_INIT;
+
+  int32_t err = callUdf(handle, callType, NULL, NULL, NULL, NULL, interBuf);
+
+  return err;
+}
+
+// input: block, state
+// output: interbuf,
+int32_t callUdfAggProcess(UdfHandle handle, SSDataBlock *block, SUdfInterBuf *state, SUdfInterBuf *newState) {
+  int8_t callType = TSDB_UDF_CALL_AGG_PROC;
+  int32_t err = callUdf(handle, callType, block, state, NULL, NULL, newState);
+  return err;
+}
+
+// input: interbuf1, interbuf2
+// output: resultBuf
+int32_t callUdfAggMerge(UdfHandle handle, SUdfInterBuf *interBuf1, SUdfInterBuf *interBuf2, SUdfInterBuf *resultBuf) {
+  int8_t callType = TSDB_UDF_CALL_AGG_MERGE;
+  int32_t err = callUdf(handle, callType, NULL, interBuf1, interBuf2, NULL, resultBuf);
+  return err;
+}
+
+// input: interBuf
+// output: resultData
+int32_t callUdfAggFinalize(UdfHandle handle, SUdfInterBuf *interBuf, SUdfInterBuf *resultData) {
+  int8_t callType = TSDB_UDF_CALL_AGG_PROC;
+  int32_t err = callUdf(handle, callType, NULL, interBuf, NULL, NULL, resultData);
+  return err;
+}
+
+// input: block
+// output: resultData
+int32_t callUdfScalaProcess(UdfHandle handle, SSDataBlock *block, SSDataBlock *resultData) {
+  int8_t callType = TSDB_UDF_CALL_SCALA_PROC;
+  int32_t err = callUdf(handle, callType, block, NULL, NULL, resultData, NULL);
+  return err;
+}
+
 int32_t teardownUdf(UdfHandle handle) {
   debugPrint("%s", "client teardown udf");
 
diff --git a/source/libs/function/src/udfd.c b/source/libs/function/src/udfd.c
index 76c731a473..d5c917121a 100644
--- a/source/libs/function/src/udfd.c
+++ b/source/libs/function/src/udfd.c
@@ -112,8 +112,8 @@ void udfdProcessRequest(uv_work_t *req) {
             SUdf *udf = handle->udf;
 
             SUdfDataBlock input = {0};
-            //TODO: convertSDataBlockToUdfDataBlock(call->block, &input);
-            SUdfColumnData output;
+            convertDataBlockToUdfDataBlock(&call->block, &input);
+            SUdfColumn output;
 	    //TODO: call different functions according to call type, for now just calar
             if (call->callType == TSDB_UDF_CALL_SCALA_PROC) {
               udf->scalarProcFunc(input, &output);
@@ -126,7 +126,7 @@ void udfdProcessRequest(uv_work_t *req) {
               rsp->type = request.type;
               rsp->code = 0;
               SUdfCallResponse *subRsp = &rsp->callRsp;
-              //TODO: convertSUdfColumnDataToSSDataBlock(output, &subRsp->resultData);
+              convertUdfColumnToDataBlock(&output, &subRsp->resultData);
             }
 
             int32_t len = encodeUdfResponse(NULL, rsp);