diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index fe4e9fd43ee53b6cd95bb9e508bcf7693f47b748..76be8a05c549ee19cee1e647b1ae3387fa613e98 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -2494,6 +2494,8 @@ bool apercentileFunctionSetup(SqlFunctionCtx* pCtx, SResultRowEntryInfo* pResult
   } else {
     buildHistogramInfo(pInfo);
     pInfo->pHisto = tHistogramCreateFrom(tmp, MAX_HISTOGRAM_BIN);
+    qDebug("%s set up histogram, numOfElems:%" PRId64 ", numOfEntry:%d, pHisto:%p, elems:%p", __FUNCTION__,
+           pInfo->pHisto->numOfElems, pInfo->pHisto->numOfEntries, pInfo->pHisto, pInfo->pHisto->elems);
   }
 
   return true;
@@ -2524,6 +2526,9 @@ int32_t apercentileFunction(SqlFunctionCtx* pCtx) {
       tdigestAdd(pInfo->pTDigest, v, w);
     }
   } else {
+    qDebug("%s before add %d elements into histogram, total:%d, numOfEntry:%d, pHisto:%p, elems: %p", __FUNCTION__,
+           numOfElems, pInfo->pHisto->numOfElems, pInfo->pHisto->numOfEntries, pInfo->pHisto, pInfo->pHisto->elems);
+
     for (int32_t i = start; i < pInput->numOfRows + start; ++i) {
       if (colDataIsNull_f(pCol->nullbitmap, i)) {
         continue;
@@ -2536,8 +2541,8 @@ int32_t apercentileFunction(SqlFunctionCtx* pCtx) {
       tHistogramAdd(&pInfo->pHisto, v);
     }
 
-    qDebug("add %d elements into histogram, total:%d, numOfEntry:%d, %p", numOfElems, pInfo->pHisto->numOfElems,
-           pInfo->pHisto->numOfEntries, pInfo->pHisto);
+    qDebug("%s after add %d elements into histogram, total:%d, numOfEntry:%d, pHisto:%p, elems: %p", __FUNCTION__,
+           numOfElems, pInfo->pHisto->numOfElems, pInfo->pHisto->numOfEntries, pInfo->pHisto, pInfo->pHisto->elems);
   }
 
   SET_VAL(pResInfo, numOfElems, 1);
@@ -2577,17 +2582,19 @@ static void apercentileTransferInfo(SAPercentileInfo* pInput, SAPercentileInfo*
       memcpy(pHisto, pInput->pHisto, sizeof(SHistogramInfo) + sizeof(SHistBin) * (MAX_HISTOGRAM_BIN + 1));
       pHisto->elems = (SHistBin*)((char*)pHisto + sizeof(SHistogramInfo));
 
-      qDebug("merge histo, total:%" PRId64 ", entry:%d, %p", pHisto->numOfElems, pHisto->numOfEntries, pHisto);
+      qDebug("%s merge histo, total:%" PRId64 ", entry:%d, %p", __FUNCTION__, pHisto->numOfElems,
+              pHisto->numOfEntries, pHisto);
     } else {
       pHisto->elems = (SHistBin*)((char*)pHisto + sizeof(SHistogramInfo));
-      qDebug("input histogram, elem:%" PRId64 ", entry:%d, %p", pHisto->numOfElems, pHisto->numOfEntries,
-             pInput->pHisto);
+      qDebug("%s input histogram, elem:%" PRId64 ", entry:%d, %p", __FUNCTION__, pHisto->numOfElems,
+             pHisto->numOfEntries, pInput->pHisto);
 
       SHistogramInfo* pRes = tHistogramMerge(pHisto, pInput->pHisto, MAX_HISTOGRAM_BIN);
       memcpy(pHisto, pRes, sizeof(SHistogramInfo) + sizeof(SHistBin) * MAX_HISTOGRAM_BIN);
       pHisto->elems = (SHistBin*)((char*)pHisto + sizeof(SHistogramInfo));
 
-      qDebug("merge histo, total:%" PRId64 ", entry:%d, %p", pHisto->numOfElems, pHisto->numOfEntries, pHisto);
+      qDebug("%s merge histo, total:%" PRId64 ", entry:%d, %p", __FUNCTION__, pHisto->numOfElems,
+             pHisto->numOfEntries, pHisto);
       tHistogramDestroy(&pRes);
     }
   }
@@ -2603,7 +2610,7 @@ int32_t apercentileFunctionMerge(SqlFunctionCtx* pCtx) {
 
   SAPercentileInfo* pInfo = GET_ROWCELL_INTERBUF(pResInfo);
 
-  qDebug("total %d rows will merge, %p", pInput->numOfRows, pInfo->pHisto);
+  qDebug("%s total %d rows will merge, %p", __FUNCTION__, pInput->numOfRows, pInfo->pHisto);
 
   int32_t start = pInput->startRowIndex;
   for (int32_t i = start; i < start + pInput->numOfRows; ++i) {
@@ -2614,7 +2621,7 @@ int32_t apercentileFunctionMerge(SqlFunctionCtx* pCtx) {
   }
 
   if (pInfo->algo != APERCT_ALGO_TDIGEST) {
-    qDebug("after merge, total:%d, numOfEntry:%d, %p", pInfo->pHisto->numOfElems, pInfo->pHisto->numOfEntries,
+    qDebug("%s after merge, total:%d, numOfEntry:%d, %p", __FUNCTION__, pInfo->pHisto->numOfElems, pInfo->pHisto->numOfEntries,
            pInfo->pHisto);
   }
 
@@ -2637,8 +2644,8 @@ int32_t apercentileFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   } else {
     buildHistogramInfo(pInfo);
     if (pInfo->pHisto->numOfElems > 0) {
-      qDebug("get the final res:%d, elements:%" PRId64 ", entry:%d", pInfo->pHisto->numOfElems,
-             pInfo->pHisto->numOfEntries);
+      qDebug("%s get the final res, elements:%" PRId64 ", numOfEntry:%d, pHisto:%p, elems:%p", __FUNCTION__,
+             pInfo->pHisto->numOfElems, pInfo->pHisto->numOfEntries, pInfo->pHisto, pInfo->pHisto->elems);
 
       double  ratio[] = {pInfo->percent};
       double* res = tHistogramUniform(pInfo->pHisto, ratio, 1);
@@ -2693,7 +2700,7 @@ int32_t apercentileCombine(SqlFunctionCtx* pDestCtx, SqlFunctionCtx* pSourceCtx)
   SResultRowEntryInfo* pSResInfo = GET_RES_INFO(pSourceCtx);
   SAPercentileInfo*    pSBuf = GET_ROWCELL_INTERBUF(pSResInfo);
 
-  qDebug("start to combine apercentile, %p", pDBuf->pHisto);
+  qDebug("%s start to combine apercentile, %p", __FUNCTION__, pDBuf->pHisto);
 
   apercentileTransferInfo(pSBuf, pDBuf);
   pDResInfo->numOfRes = TMAX(pDResInfo->numOfRes, pSResInfo->numOfRes);