diff --git a/src/client/inc/tscUtil.h b/src/client/inc/tscUtil.h
index 687d182bb696dd745eb3795ccc23b6284cec0a30..b3674a7bf5bf94806dfd576b4e81af95413bb5bd 100644
--- a/src/client/inc/tscUtil.h
+++ b/src/client/inc/tscUtil.h
@@ -340,7 +340,7 @@ STableMeta* createSuperTableMeta(STableMetaMsg* pChild);
 uint32_t tscGetTableMetaSize(STableMeta* pTableMeta);
 CChildTableMeta* tscCreateChildMeta(STableMeta* pTableMeta);
 uint32_t tscGetTableMetaMaxSize();
-int32_t tscCreateTableMetaFromSTableMeta(STableMeta* pChild, const char* name, void* buf);
+int32_t tscCreateTableMetaFromSTableMeta(STableMeta** pChild, const char* name, size_t *tableMetaCapacity);
 STableMeta* tscTableMetaDup(STableMeta* pTableMeta);
 SVgroupsInfo* tscVgroupsInfoDup(SVgroupsInfo* pVgroupsInfo);
 
diff --git a/src/client/src/tscParseLineProtocol.c b/src/client/src/tscParseLineProtocol.c
index 7d2823a42edc3ea7616e822d47cfdbf8706f4a56..69e55fd3339c7dac3de80872dbb3a0f09fc38a6e 100644
--- a/src/client/src/tscParseLineProtocol.c
+++ b/src/client/src/tscParseLineProtocol.c
@@ -458,9 +458,9 @@ int32_t loadTableMeta(TAOS* taos, char* tableName, SSmlSTableSchema* schema, SSm
   schema->tagHash = taosHashInit(8, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, false);
   schema->fieldHash = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), true, false);
 
-  uint32_t size = tscGetTableMetaMaxSize();
-  STableMeta* tableMeta = calloc(1, size);
-  taosHashGetClone(tscTableMetaMap, fullTableName, strlen(fullTableName), NULL, tableMeta);
+  size_t size = 0; 
+  STableMeta* tableMeta = NULL; 
+  taosHashGetCloneExt(tscTableMetaMap, fullTableName, strlen(fullTableName), NULL, (void **)&tableMeta, &size);
 
   tstrncpy(schema->sTableName, tableName, strlen(tableName)+1);
   schema->precision = tableMeta->tableInfo.precision;
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index e6720c0f4e327413de9cd4a80e67aa0bd12b72a9..7adc0812ae12bd8711cba5988806a4c7ba740cf5 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -8089,6 +8089,7 @@ int32_t loadAllTableMeta(SSqlObj* pSql, struct SSqlInfo* pInfo) {
   SArray* pVgroupList   = NULL;
   SArray* plist         = NULL;
   STableMeta* pTableMeta = NULL;
+  size_t    tableMetaCapacity = 0;
   SQueryInfo* pQueryInfo = tscGetQueryInfo(pCmd);
 
   pCmd->pTableMetaMap = taosHashInit(4, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_NO_LOCK);
@@ -8115,18 +8116,14 @@ int32_t loadAllTableMeta(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     }
   }
 
-  uint32_t maxSize = tscGetTableMetaMaxSize();
   char     name[TSDB_TABLE_FNAME_LEN] = {0};
 
-  assert(maxSize < 80 * TSDB_MAX_COLUMNS);
-  if (!pSql->pBuf) {
-    if (NULL == (pSql->pBuf = tcalloc(1, 80 * TSDB_MAX_COLUMNS))) {
-      code = TSDB_CODE_TSC_OUT_OF_MEMORY;
-      goto _end;
-    }
-  }
-
-  pTableMeta = calloc(1, maxSize);
+  //if (!pSql->pBuf) {
+  //  if (NULL == (pSql->pBuf = tcalloc(1, 80 * TSDB_MAX_COLUMNS))) {
+  //    code = TSDB_CODE_TSC_OUT_OF_MEMORY;
+  //    goto _end;
+  //  }
+  //}
 
   plist = taosArrayInit(4, POINTER_BYTES);
   pVgroupList = taosArrayInit(4, POINTER_BYTES);
@@ -8140,16 +8137,16 @@ int32_t loadAllTableMeta(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     tNameExtractFullName(pname, name);
 
     size_t len = strlen(name);
-    memset(pTableMeta, 0, maxSize);
-    taosHashGetClone(tscTableMetaMap, name, len, NULL, pTableMeta);
+      
+    taosHashGetCloneExt(tscTableMetaMap, name, len, NULL,  (void **)&pTableMeta, &tableMetaCapacity);
 
-    if (pTableMeta->id.uid > 0) {
+    if (pTableMeta && pTableMeta->id.uid > 0) {
       tscDebug("0x%"PRIx64" retrieve table meta %s from local buf", pSql->self, name);
 
       // avoid mem leak, may should update pTableMeta
       void* pVgroupIdList = NULL;
       if (pTableMeta->tableType == TSDB_CHILD_TABLE) {
-        code = tscCreateTableMetaFromSTableMeta(pTableMeta, name, pSql->pBuf);
+        code = tscCreateTableMetaFromSTableMeta((STableMeta **)(&pTableMeta), name, &tableMetaCapacity);
 
         // create the child table meta from super table failed, try load it from mnode
         if (code != TSDB_CODE_SUCCESS) {
@@ -8304,7 +8301,8 @@ static int32_t doLoadAllTableMeta(SSqlObj* pSql, SQueryInfo* pQueryInfo, SSqlNod
     tNameExtractFullName(&pTableMetaInfo->name, fname);
     STableMetaVgroupInfo* p = taosHashGet(pCmd->pTableMetaMap, fname, strnlen(fname, TSDB_TABLE_FNAME_LEN));
 
-    pTableMetaInfo->pTableMeta = tscTableMetaDup(p->pTableMeta);
+    pTableMetaInfo->pTableMeta        = tscTableMetaDup(p->pTableMeta);
+    pTableMetaInfo->tableMetaCapacity = tscGetTableMetaSize(pTableMetaInfo->pTableMeta);
     assert(pTableMetaInfo->pTableMeta != NULL);
 
     if (p->vgroupIdList != NULL) {
@@ -8404,7 +8402,8 @@ static int32_t doValidateSubquery(SSqlNode* pSqlNode, int32_t index, SSqlObj* pS
   if (pTableMetaInfo1 == NULL) {
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
   }
-  pTableMetaInfo1->pTableMeta = extractTempTableMetaFromSubquery(pSub);
+  pTableMetaInfo1->pTableMeta        = extractTempTableMetaFromSubquery(pSub);
+  pTableMetaInfo1->tableMetaCapacity = tscGetTableMetaSize(pTableMetaInfo1->pTableMeta);
 
   if (subInfo->aliasName.n > 0) {
     if (subInfo->aliasName.n >= TSDB_TABLE_FNAME_LEN) {
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 53fd05863b994d86c1e06b24fc35b2a1d8e088a6..3e8dfac1da0cb192282989b9ab1137427365b6d0 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -2840,43 +2840,22 @@ int32_t getMultiTableMetaFromMnode(SSqlObj *pSql, SArray* pNameList, SArray* pVg
 int32_t tscGetTableMetaImpl(SSqlObj* pSql, STableMetaInfo *pTableMetaInfo, bool autocreate, bool onlyLocal) {
   assert(tIsValidName(&pTableMetaInfo->name));
 
-  uint32_t size = tscGetTableMetaMaxSize();
-  if (pTableMetaInfo->pTableMeta == NULL) {
-    pTableMetaInfo->pTableMeta    = calloc(1, size);
-    pTableMetaInfo->tableMetaSize = size;
-  } else if (pTableMetaInfo->tableMetaSize < size) {
-    char *tmp = realloc(pTableMetaInfo->pTableMeta, size);
-    if (tmp == NULL) {
-      return TSDB_CODE_TSC_OUT_OF_MEMORY;
-    }
-    pTableMetaInfo->pTableMeta = (STableMeta *)tmp;
-  }
-
-  memset(pTableMetaInfo->pTableMeta, 0, size);
-  pTableMetaInfo->tableMetaSize = size;
-
-  pTableMetaInfo->pTableMeta->tableType = -1;
-  pTableMetaInfo->pTableMeta->tableInfo.numOfColumns  = -1;
-
   char name[TSDB_TABLE_FNAME_LEN] = {0};
   tNameExtractFullName(&pTableMetaInfo->name, name);
 
   size_t len = strlen(name);
-  taosHashGetClone(tscTableMetaMap, name, len, NULL, pTableMetaInfo->pTableMeta);
-
-  // TODO resize the tableMeta
-  assert(size < 80 * TSDB_MAX_COLUMNS);
-  if (!pSql->pBuf) {
-    if (NULL == (pSql->pBuf = tcalloc(1, 80 * TSDB_MAX_COLUMNS))) {
-      return TSDB_CODE_TSC_OUT_OF_MEMORY;
-    }
-  }
+  if (pTableMetaInfo->tableMetaCapacity != 0) {
+    if (pTableMetaInfo->pTableMeta != NULL) {
+      memset(pTableMetaInfo->pTableMeta, 0, pTableMetaInfo->tableMetaCapacity);
+    } 
+  } 
+  taosHashGetCloneExt(tscTableMetaMap, name, len, NULL, (void **)&(pTableMetaInfo->pTableMeta), &pTableMetaInfo->tableMetaCapacity);
 
   STableMeta* pMeta = pTableMetaInfo->pTableMeta;
-  if (pMeta->id.uid > 0) {
+  if (pMeta && pMeta->id.uid > 0) {
     // in case of child table, here only get the
     if (pMeta->tableType == TSDB_CHILD_TABLE) {
-      int32_t code = tscCreateTableMetaFromSTableMeta(pTableMetaInfo->pTableMeta, name, pSql->pBuf);
+      int32_t code = tscCreateTableMetaFromSTableMeta(&pTableMetaInfo->pTableMeta, name, &pTableMetaInfo->tableMetaCapacity);
       if (code != TSDB_CODE_SUCCESS) {
         return getTableMetaFromMnode(pSql, pTableMetaInfo, autocreate);
       }
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index b5f965627715f75b0d9e8d8b8148e27942e573ac..5a724af7bf17e4aa09eac880f6c6176db4bdd96d 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -1657,6 +1657,7 @@ int32_t tscCopyDataBlockToPayload(SSqlObj* pSql, STableDataBlocks* pDataBlock) {
 
     pTableMetaInfo->pTableMeta    = tscTableMetaDup(pDataBlock->pTableMeta);
     pTableMetaInfo->tableMetaSize = tscGetTableMetaSize(pDataBlock->pTableMeta);
+    pTableMetaInfo->tableMetaCapacity =  (size_t)(pTableMetaInfo->tableMetaSize);
   }
 
   /*
@@ -3414,6 +3415,8 @@ STableMetaInfo* tscAddTableMetaInfo(SQueryInfo* pQueryInfo, SName* name, STableM
   } else {
     pTableMetaInfo->tableMetaSize = tscGetTableMetaSize(pTableMeta);
   }
+  pTableMetaInfo->tableMetaCapacity = (size_t)(pTableMetaInfo->tableMetaSize);
+  
 
   if (vgroupList != NULL) {
     pTableMetaInfo->vgroupList = tscVgroupInfoClone(vgroupList);
@@ -4445,24 +4448,36 @@ CChildTableMeta* tscCreateChildMeta(STableMeta* pTableMeta) {
   return cMeta;
 }
 
-int32_t tscCreateTableMetaFromSTableMeta(STableMeta* pChild, const char* name, void* buf) {
-  assert(pChild != NULL && buf != NULL);
+int32_t tscCreateTableMetaFromSTableMeta(STableMeta** ppChild, const char* name, size_t *tableMetaCapacity) {
+  assert(*ppChild != NULL);
 
-  STableMeta* p = buf;
-  taosHashGetClone(tscTableMetaMap, pChild->sTableName, strnlen(pChild->sTableName, TSDB_TABLE_FNAME_LEN), NULL, p);
+  STableMeta* p    = NULL;
+  size_t      sz   = 0;
+  STableMeta* pChild = *ppChild;
+   
+  taosHashGetCloneExt(tscTableMetaMap, pChild->sTableName, strnlen(pChild->sTableName, TSDB_TABLE_FNAME_LEN), NULL, (void **)&p, &sz);
 
   // tableMeta exists, build child table meta according to the super table meta
   // the uid need to be checked in addition to the general name of the super table.
-  if (p->id.uid > 0 && pChild->suid == p->id.uid) {
+  if (p && p->id.uid > 0 && pChild->suid == p->id.uid) {
+
+    int32_t totalBytes    = (p->tableInfo.numOfColumns + p->tableInfo.numOfTags) * sizeof(SSchema);
+    int32_t tableMetaSize =  sizeof(STableMeta)  + totalBytes;
+    if (*tableMetaCapacity < tableMetaSize) {
+      pChild = realloc(pChild, tableMetaSize); 
+      *tableMetaCapacity = (size_t)tableMetaSize;
+    }
+
     pChild->sversion = p->sversion;
     pChild->tversion = p->tversion;
-
     memcpy(&pChild->tableInfo, &p->tableInfo, sizeof(STableComInfo));
-    int32_t total = pChild->tableInfo.numOfColumns + pChild->tableInfo.numOfTags;
+    memcpy(pChild->schema, p->schema, totalBytes);
 
-    memcpy(pChild->schema, p->schema, sizeof(SSchema) *total);
+    *ppChild = pChild;
+    tfree(p);
     return TSDB_CODE_SUCCESS;
   } else { // super table has been removed, current tableMeta is also expired. remove it here
+    tfree(p);
     taosHashRemove(tscTableMetaMap, name, strnlen(name, TSDB_TABLE_FNAME_LEN));
     return -1;
   }
@@ -4992,4 +5007,4 @@ void tscRemoveTableMetaBuf(STableMetaInfo* pTableMetaInfo, uint64_t id) {
 
   taosHashRemove(tscTableMetaMap, fname, len);
   tscDebug("0x%"PRIx64" remove table meta %s, numOfRemain:%d", id, fname, (int32_t) taosHashGetSize(tscTableMetaMap));
-}
\ No newline at end of file
+}
diff --git a/src/query/inc/qTableMeta.h b/src/query/inc/qTableMeta.h
index 4bb5483a10dc8f1b0904c17b5b3c81973115470d..0dae74ac8224329810064c773ecd478d4a89ad15 100644
--- a/src/query/inc/qTableMeta.h
+++ b/src/query/inc/qTableMeta.h
@@ -71,7 +71,8 @@ typedef struct STableMeta {
 
 typedef struct STableMetaInfo {
   STableMeta    *pTableMeta;      // table meta, cached in client side and acquired by name
-  uint32_t       tableMetaSize;
+  uint32_t      tableMetaSize;
+  size_t        tableMetaCapacity; 
   SVgroupsInfo  *vgroupList;
   SArray        *pVgroupTables;   // SArray<SVgroupTableInfo>
 
diff --git a/src/util/inc/hash.h b/src/util/inc/hash.h
index a53aa602c1e309ef0c25e370ae084b5a33e4144c..6c4145810b9819e60a9cb979a8ab42795df3cf00 100644
--- a/src/util/inc/hash.h
+++ b/src/util/inc/hash.h
@@ -127,6 +127,16 @@ void *taosHashGet(SHashObj *pHashObj, const void *key, size_t keyLen);
  */
 void* taosHashGetClone(SHashObj *pHashObj, const void *key, size_t keyLen, void (*fp)(void *), void* d);
 
+/**
+ * @param pHashObj
+ * @param key
+ * @param keyLen
+ * @param fp
+ * @param d
+ * @param sz 
+ * @return
+ */
+void* taosHashGetCloneExt(SHashObj *pHashObj, const void *key, size_t keyLen, void (*fp)(void *), void** d, size_t *sz);
 /**
  * remove item with the specified key
  * @param pHashObj
diff --git a/src/util/src/hash.c b/src/util/src/hash.c
index 2e18f36a17f9b3112c4d1747afa37944a1e93d28..6118aa7bef8b426a909cee19b6ee2aba2ed6dfc4 100644
--- a/src/util/src/hash.c
+++ b/src/util/src/hash.c
@@ -18,6 +18,8 @@
 #include "tulog.h"
 #include "taosdef.h"
 
+#define EXT_SIZE 1024 
+
 #define HASH_NEED_RESIZE(_h) ((_h)->size >= (_h)->capacity * HASH_DEFAULT_LOAD_FACTOR)
 
 #define DO_FREE_HASH_NODE(_n) \
@@ -296,6 +298,68 @@ int32_t taosHashPut(SHashObj *pHashObj, const void *key, size_t keyLen, void *da
 void *taosHashGet(SHashObj *pHashObj, const void *key, size_t keyLen) {
   return taosHashGetClone(pHashObj, key, keyLen, NULL, NULL);
 }
+//TODO(yihaoDeng), merge with taosHashGetClone
+void* taosHashGetCloneExt(SHashObj *pHashObj, const void *key, size_t keyLen, void (*fp)(void *), void** d, size_t *sz) {
+  if (taosHashTableEmpty(pHashObj) || keyLen == 0 || key == NULL) {
+    return NULL;
+  }
+
+  uint32_t hashVal = (*pHashObj->hashFp)(key, (uint32_t)keyLen);
+
+  // only add the read lock to disable the resize process
+  __rd_lock(&pHashObj->lock, pHashObj->type);
+
+  int32_t     slot = HASH_INDEX(hashVal, pHashObj->capacity);
+  SHashEntry *pe = pHashObj->hashList[slot];
+
+  // no data, return directly
+  if (atomic_load_32(&pe->num) == 0) {
+    __rd_unlock(&pHashObj->lock, pHashObj->type);
+    return NULL;
+  }
+
+  char *data = NULL;
+
+  // lock entry
+  if (pHashObj->type == HASH_ENTRY_LOCK) {
+    taosRLockLatch(&pe->latch);
+  }
+
+  if (pe->num > 0) {
+    assert(pe->next != NULL);
+  } else {
+    assert(pe->next == NULL);
+  }
+
+  SHashNode *pNode = doSearchInEntryList(pHashObj, pe, key, keyLen, hashVal);
+  if (pNode != NULL) {
+    if (fp != NULL) {
+      fp(GET_HASH_NODE_DATA(pNode));
+    }
+     
+    if (*d == NULL) {
+      *sz =  pNode->dataLen + EXT_SIZE;
+      *d  =  calloc(1, *sz);   
+    } else if (*sz < pNode->dataLen){
+      *sz = pNode->dataLen + EXT_SIZE;
+      *d  = realloc(*d, *sz); 
+    }
+    memcpy((char *)(*d), GET_HASH_NODE_DATA(pNode), pNode->dataLen);
+    // just make runtime happy 
+    if ((*sz) - pNode->dataLen > 0) {
+      memset((char *)(*d) + pNode->dataLen, 0, (*sz) - pNode->dataLen);
+    } 
+
+    data = GET_HASH_NODE_DATA(pNode);
+  }
+
+  if (pHashObj->type == HASH_ENTRY_LOCK) {
+    taosRUnLockLatch(&pe->latch);
+  }
+
+  __rd_unlock(&pHashObj->lock, pHashObj->type);
+  return data;
+}
 
 void* taosHashGetClone(SHashObj *pHashObj, const void *key, size_t keyLen, void (*fp)(void *), void* d) {
   if (taosHashTableEmpty(pHashObj) || keyLen == 0 || key == NULL) {