diff --git a/src/client/src/tscLocalMerge.c b/src/client/src/tscLocalMerge.c
index c67edf5b5a8a026fc10d251218abcf96ab018359..f49c4da0cbc01ab657a82bf90baeb5adddd7241f 100644
--- a/src/client/src/tscLocalMerge.c
+++ b/src/client/src/tscLocalMerge.c
@@ -97,6 +97,9 @@ static void tscInitSqlContext(SSqlCmd *pCmd, SLocalReducer *pReducer, tOrderDesc
       pCtx->param[2].i64Key = pQueryInfo->order.order;
       pCtx->param[2].nType  = TSDB_DATA_TYPE_BIGINT;
       pCtx->param[1].i64Key = pQueryInfo->order.orderColId;
+    } else if (functionId == TSDB_FUNC_APERCT) {
+      pCtx->param[0].i64Key = pExpr->param[0].i64Key;
+      pCtx->param[0].nType  = pExpr->param[0].nType;
     }
 
     pCtx->interBufBytes = pExpr->interBytes;
diff --git a/src/query/src/qHistogram.c b/src/query/src/qHistogram.c
index 703ee2c52129a067d1070cfbe567087ec48a7a6e..35e5906d1f797c2f53f3906bf93c6797ac766c3e 100644
--- a/src/query/src/qHistogram.c
+++ b/src/query/src/qHistogram.c
@@ -168,7 +168,7 @@ int32_t tHistogramAdd(SHistogramInfo** pHisto, double val) {
       (*pHisto)->numOfEntries += 1;
     }
   } else { /* insert a new slot */
-    if ((*pHisto)->numOfElems > 1 && idx < (*pHisto)->numOfEntries) {
+    if ((*pHisto)->numOfElems >= 1 && idx < (*pHisto)->numOfEntries) {
       if (idx > 0) {
         assert((*pHisto)->elems[idx - 1].val <= val);
       }
@@ -661,4 +661,4 @@ SHistogramInfo* tHistogramMerge(SHistogramInfo* pHisto1, SHistogramInfo* pHisto2
 
   free(pHistoBins);
   return pResHistogram;
-}
\ No newline at end of file
+}