diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 1e49f8e34d8c980c13a358967ddd0434fb0c277e..b10a36e2efd06f2e9c0f887a10e241229242ea9a 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -205,7 +205,7 @@ static bool validateApercentileAlgo(const SValueNode* pVal) {
           0 == strcasecmp(varDataVal(pVal->datum.p), "t-digest"));
 }
 
-static int32_t translateApercentileImpl(SFunctionNode* pFunc, char* pErrBuf, int32_t len, bool isPartial) {
+static int32_t translateApercentile(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
   int32_t numOfParams = LIST_LENGTH(pFunc->pParameterList);
   if (2 != numOfParams && 3 != numOfParams) {
     return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
@@ -247,11 +247,66 @@ static int32_t translateApercentileImpl(SFunctionNode* pFunc, char* pErrBuf, int
     pValue->notReserved = true;
   }
 
-  if (!isPartial) {
-    pFunc->node.resType = (SDataType){.bytes = tDataTypes[TSDB_DATA_TYPE_DOUBLE].bytes, .type = TSDB_DATA_TYPE_DOUBLE};
+  pFunc->node.resType = (SDataType){.bytes = tDataTypes[TSDB_DATA_TYPE_DOUBLE].bytes, .type = TSDB_DATA_TYPE_DOUBLE};
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t translateApercentileImpl(SFunctionNode* pFunc, char* pErrBuf, int32_t len, bool isPartial) {
+  int32_t numOfParams = LIST_LENGTH(pFunc->pParameterList);
+
+  if (isPartial) {
+    if (2 != numOfParams && 3 != numOfParams) {
+      return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+    // param1
+    SNode* pParamNode1 = nodesListGetNode(pFunc->pParameterList, 1);
+    if (nodeType(pParamNode1) != QUERY_NODE_VALUE) {
+      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+
+    SValueNode* pValue = (SValueNode*)pParamNode1;
+    if (pValue->datum.i < 0 || pValue->datum.i > 100) {
+      return invaildFuncParaValueErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+
+    pValue->notReserved = true;
+
+    uint8_t para1Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
+    uint8_t para2Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 1))->resType.type;
+    if (!IS_NUMERIC_TYPE(para1Type) || !IS_INTEGER_TYPE(para2Type)) {
+      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+
+    // param2
+    if (3 == numOfParams) {
+      uint8_t para3Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 2))->resType.type;
+      if (!IS_VAR_DATA_TYPE(para3Type)) {
+        return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+      }
+
+      SNode* pParamNode2 = nodesListGetNode(pFunc->pParameterList, 2);
+      if (QUERY_NODE_VALUE != nodeType(pParamNode2) || !validateApercentileAlgo((SValueNode*)pParamNode2)) {
+        return buildFuncErrMsg(pErrBuf, len, TSDB_CODE_FUNC_FUNTION_ERROR,
+                               "Third parameter algorithm of apercentile must be 'default' or 't-digest'");
+      }
+
+      pValue = (SValueNode*)pParamNode2;
+      pValue->notReserved = true;
+    }
+
+    pFunc->node.resType = (SDataType){.bytes = getApercentileMaxSize() + VARSTR_HEADER_SIZE, .type = TSDB_DATA_TYPE_BINARY};
   } else {
-    pFunc->node.resType = (SDataType){.bytes = 1000, .type = TSDB_DATA_TYPE_BINARY};
+    if (1 != numOfParams) {
+      return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+    uint8_t para1Type = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
+    if (!IS_NUMERIC_TYPE(para1Type)) {
+      return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
+    }
+
+    pFunc->node.resType = (SDataType){.bytes = tDataTypes[TSDB_DATA_TYPE_DOUBLE].bytes, .type = TSDB_DATA_TYPE_DOUBLE};
   }
+
   return TSDB_CODE_SUCCESS;
 }
 
@@ -1164,7 +1219,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .name = "apercentile",
     .type = FUNCTION_TYPE_APERCENTILE,
     .classification = FUNC_MGT_AGG_FUNC,
-    .translateFunc = translateApercentileFinal,
+    .translateFunc = translateApercentile,
     .getEnvFunc   = getApercentileFuncEnv,
     .initFunc     = apercentileFunctionSetup,
     .processFunc  = apercentileFunction,
@@ -1188,7 +1243,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .classification = FUNC_MGT_AGG_FUNC,
     .translateFunc = translateApercentileFinal,
     .getEnvFunc   = getApercentileFuncEnv,
-    .initFunc     = apercentileFunctionSetup,
+    .initFunc     = NULL,//apercentileFunctionSetup,
     .processFunc  = apercentileFunction,
     .finalizeFunc = apercentileFinalize
   },
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 13d3e943372336f55296c4441513456f17a88e70..c63cc5366be18a3cff357a054de62adf9ce6fc48 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -2047,6 +2047,55 @@ int32_t apercentileFunction(SqlFunctionCtx* pCtx) {
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t apercentileFunctionMerge(SqlFunctionCtx* pCtx) {
+  int32_t              numOfElems = 0;
+  SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
+
+  SInputColumnInfoData* pInput = &pCtx->input;
+
+  SColumnInfoData* pCol = pInput->pData[0];
+  int32_t          type = pCol->info.type;
+
+  SAPercentileInfo* pInfo = GET_ROWCELL_INTERBUF(pResInfo);
+  SAPercentileInfo* pInputInfo;
+
+  int32_t start = pInput->startRowIndex;
+  for (int32_t i = start; i < pInput->numOfRows + start; ++i) {
+    //if (colDataIsNull_s(pCol, i)) {
+    //  continue;
+    //}
+    numOfElems += 1;
+    char* data = colDataGetData(pCol, i);
+
+    pInputInfo = (SAPercentileInfo *)varDataVal(data);
+  }
+
+  if (pInfo->algo == APERCT_ALGO_TDIGEST) {
+  } else {
+    buildHistogramInfo(pInputInfo);
+    if (pInputInfo->pHisto->numOfElems <= 0) {
+      return TSDB_CODE_SUCCESS;
+    }
+
+    buildHistogramInfo(pInfo);
+    SHistogramInfo  *pHisto = pInfo->pHisto;
+
+    if (pHisto->numOfElems <= 0) {
+      memcpy(pHisto, pInputInfo->pHisto, sizeof(SHistogramInfo) + sizeof(SHistBin) * (MAX_HISTOGRAM_BIN + 1));
+      pHisto->elems = (SHistBin*) ((char *)pHisto + sizeof(SHistogramInfo));
+    } else {
+      pHisto->elems = (SHistBin*) ((char *)pHisto + sizeof(SHistogramInfo));
+      SHistogramInfo *pRes = tHistogramMerge(pHisto, pInputInfo->pHisto, MAX_HISTOGRAM_BIN);
+      memcpy(pHisto, pRes, sizeof(SHistogramInfo) + sizeof(SHistBin) * MAX_HISTOGRAM_BIN);
+      pHisto->elems = (SHistBin*) ((char *)pHisto + sizeof(SHistogramInfo));
+      tHistogramDestroy(&pRes);
+    }
+  }
+
+  SET_VAL(pResInfo, numOfElems, 1);
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t apercentileFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   SVariant* pVal    = &pCtx->param[1].param;
   double    percent = (pVal->nType == TSDB_DATA_TYPE_BIGINT) ? pVal->i : pVal->d;
@@ -2091,13 +2140,15 @@ int32_t apercentilePartialFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
 
   if (pInfo->algo == APERCT_ALGO_TDIGEST) {
     if (pInfo->pTDigest->size > 0) {
-      memcpy(varDataVal(tmp), pInfo->pTDigest, resultBytes);
+      memcpy(varDataVal(tmp), pInfo, resultBytes);
+      varDataSetLen(tmp, resultBytes);
     } else {
       return TSDB_CODE_SUCCESS;
     }
   } else {
     if (pInfo->pHisto->numOfElems > 0) {
       memcpy(varDataVal(tmp), pInfo->pHisto, resultBytes);
+      varDataSetLen(tmp, resultBytes);
     } else {
       return TSDB_CODE_SUCCESS;
     }