diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index af28d7b3bf37d0bdf5e4734cd3229e3ad2d21c07..bdaec7e2faa5ad0ffed0a432c015265f28218555 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -124,6 +124,7 @@ typedef struct SQueryCostInfo {
   uint64_t firstStageMergeTime;
   uint64_t winInfoSize;
   uint64_t tableInfoSize;
+  uint64_t hashSize;
   uint64_t numOfTimeWindows;
 } SQueryCostInfo;
 
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 88abb2e90c7583c6911af2b5e73ef080c9a6b4e2..3da3d6e28dd5bdcd4cc883c059c272286be86199 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -461,16 +461,16 @@ static SWindowResult *doSetTimeWindowFromKey(SQueryRuntimeEnv *pRuntimeEnv, SWin
 
     // more than the capacity, reallocate the resources
     if (pWindowResInfo->size >= pWindowResInfo->capacity) {
-      int64_t newCap = 0;
+      int64_t newCapacity = 0;
       if (pWindowResInfo->capacity > 10000) {
-        newCap = (int64_t)(pWindowResInfo->capacity * 1.25);
+        newCapacity = (int64_t)(pWindowResInfo->capacity * 1.25);
       } else {
-        newCap = (int64_t)(pWindowResInfo->capacity * 1.5);
+        newCapacity = (int64_t)(pWindowResInfo->capacity * 1.5);
       }
 
-      char *t = realloc(pWindowResInfo->pResult, (size_t)(newCap * sizeof(SWindowResult)));
-      pRuntimeEnv->summary.winInfoSize += (newCap - pWindowResInfo->capacity) * sizeof(SWindowResult);
-      pRuntimeEnv->summary.numOfTimeWindows += (newCap - pWindowResInfo->capacity);
+      char *t = realloc(pWindowResInfo->pResult, (size_t)(newCapacity * sizeof(SWindowResult)));
+      pRuntimeEnv->summary.winInfoSize += (newCapacity - pWindowResInfo->capacity) * sizeof(SWindowResult);
+      pRuntimeEnv->summary.numOfTimeWindows += (newCapacity - pWindowResInfo->capacity);
 
       if (t == NULL) {
         longjmp(pRuntimeEnv->env, TSDB_CODE_QRY_OUT_OF_MEMORY);
@@ -478,19 +478,19 @@ static SWindowResult *doSetTimeWindowFromKey(SQueryRuntimeEnv *pRuntimeEnv, SWin
 
       pWindowResInfo->pResult = (SWindowResult *)t;
 
-      int32_t inc = (int32_t)newCap - pWindowResInfo->capacity;
+      int32_t inc = (int32_t)newCapacity - pWindowResInfo->capacity;
       memset(&pWindowResInfo->pResult[pWindowResInfo->capacity], 0, sizeof(SWindowResult) * inc);
 
       pRuntimeEnv->summary.winInfoSize += (pQuery->numOfOutput * sizeof(SResultInfo) + pRuntimeEnv->interBufSize) * inc;
 
-      for (int32_t i = pWindowResInfo->capacity; i < newCap; ++i) {
+      for (int32_t i = pWindowResInfo->capacity; i < newCapacity; ++i) {
         int32_t ret = createQueryResultInfo(pQuery, &pWindowResInfo->pResult[i], pRuntimeEnv->stableQuery, pRuntimeEnv->interBufSize);
         if (ret != TSDB_CODE_SUCCESS) {
           longjmp(pRuntimeEnv->env, TSDB_CODE_QRY_OUT_OF_MEMORY);
         }
       }
 
-      pWindowResInfo->capacity = (int32_t)newCap;
+      pWindowResInfo->capacity = (int32_t)newCapacity;
     }
 
     // add a new result set for a new group
diff --git a/src/query/src/qUtil.c b/src/query/src/qUtil.c
index c454669474cecb695df4fc4a922c2ce877f20b90..3482c52052b0b0438a3f19056a1cbdb519e2acc0 100644
--- a/src/query/src/qUtil.c
+++ b/src/query/src/qUtil.c
@@ -49,16 +49,16 @@ int32_t initWindowResInfo(SWindowResInfo *pWindowResInfo, SQueryRuntimeEnv *pRun
   SQueryCostInfo* pSummary = &pRuntimeEnv->summary;
 
   // use the pointer arraylist
-  pWindowResInfo->pResult = calloc(threshold, sizeof(SWindowResult));
+  pWindowResInfo->pResult = calloc(pWindowResInfo->capacity, sizeof(SWindowResult));
   if (pWindowResInfo->pResult == NULL) {
     return TSDB_CODE_QRY_OUT_OF_MEMORY;
   }
 
   pWindowResInfo->interval = pRuntimeEnv->pQuery->interval.interval;
 
-  pSummary->winInfoSize += sizeof(SWindowResult) * threshold;
+  pSummary->winInfoSize += sizeof(SWindowResult) * pWindowResInfo->capacity;
   pSummary->winInfoSize += (pRuntimeEnv->pQuery->numOfOutput * sizeof(SResultInfo) + pRuntimeEnv->interBufSize) * pWindowResInfo->capacity;
-  pSummary->numOfTimeWindows = threshold;
+  pSummary->numOfTimeWindows = pWindowResInfo->capacity;
 
   for (int32_t i = 0; i < pWindowResInfo->capacity; ++i) {
     int32_t code = createQueryResultInfo(pRuntimeEnv->pQuery, &pWindowResInfo->pResult[i], pRuntimeEnv->stableQuery, pRuntimeEnv->interBufSize);
diff --git a/src/util/inc/hash.h b/src/util/inc/hash.h
index 2a58bec8830faab4cf9909bd417a44e2e8881570..d4e9b1677cb36d528830d43c5e97af0b6ff87276 100644
--- a/src/util/inc/hash.h
+++ b/src/util/inc/hash.h
@@ -32,7 +32,6 @@ typedef void (*_hash_free_fn_t)(void *param);
 
 typedef struct SHashNode {
   char             *key;
-//  struct SHashNode *prev;
   struct SHashNode *next;
   uint32_t          hashVal;  // the hash value of key, if hashVal == HASH_VALUE_IN_TRASH, this node is moved to trash
   uint32_t          keyLen;   // length of the key
@@ -175,6 +174,8 @@ void* taosHashDestroyIter(SHashMutableIterator* iter);
  */
 int32_t taosHashGetMaxOverflowLinkLength(const SHashObj *pHashObj);
 
+size_t taosHashGetMemSize(const SHashObj *pHashObj);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/util/src/hash.c b/src/util/src/hash.c
index 625d4af1ac981c5d1f5f079f5b15533a4d63ef24..9aadee0924d769a9a1ef53b8576f9fe062b3a578 100644
--- a/src/util/src/hash.c
+++ b/src/util/src/hash.c
@@ -798,3 +798,11 @@ SHashNode *getNextHashNode(SHashMutableIterator *pIter) {
 
   return NULL;
 }
+
+size_t taosHashGetMemSize(const SHashObj *pHashObj) {
+  if (pHashObj == NULL) {
+    return 0;
+  }
+
+  return (pHashObj->capacity * sizeof(SHashEntry) + POINTER_BYTES) + sizeof(SHashNode) * taosHashGetSize(pHashObj);
+}