feat: change bufSize for double digits

source/libs/executor/src/scanoperator.c

@@ -1143,7 +1143,7 @@ static void checkUpdateData(SStreamScanInfo* pInfo, bool invertible, SSDataBlock
     STimeWindow win = getActiveTimeWindow(NULL, &dumyInfo, tsCol[rowId], &pInfo->interval, TSDB_ORDER_ASC);
     // must check update info first.
     bool update = updateInfoIsUpdated(pInfo->pUpdateInfo, pBlock->info.uid, tsCol[rowId]);
-    if ( (update || (isSignleIntervalWindow(pInfo) && isCloseWindow(&win, &pInfo->twAggSup)) ) && out) {
+    if ((update || (isSignleIntervalWindow(pInfo) && isCloseWindow(&win, &pInfo->twAggSup))) && out) {
       taosArrayPush(pInfo->tsArray, &rowId);
     }
   }
@@ -1596,7 +1596,8 @@ SOperatorInfo* createStreamScanOperatorInfo(SReadHandle* pHandle, STableScanPhys
   pInfo->pUpdateRes = createResDataBlock(pDescNode);
   pInfo->pCondition = pScanPhyNode->node.pConditions;
   pInfo->scanMode = STREAM_SCAN_FROM_READERHANDLE;
-  pInfo->sessionSup = (SessionWindowSupporter){.pStreamAggSup = NULL, .gap = -1, .parentType = QUERY_NODE_PHYSICAL_PLAN};
+  pInfo->sessionSup =
+      (SessionWindowSupporter){.pStreamAggSup = NULL, .gap = -1, .parentType = QUERY_NODE_PHYSICAL_PLAN};
   pInfo->groupId = 0;
   pInfo->pPullDataRes = createPullDataBlock();
   pInfo->pStreamScanOp = pOperator;
@@ -1978,7 +1979,8 @@ static SSDataBlock* sysTableScanUserTags(SOperatorInfo* pOperator) {
         }
       }
 
-      int32_t bufSize = IS_VAR_DATA_TYPE(tagType) ? tagLen + VARSTR_HEADER_SIZE : 1024;
+      int32_t bufSize = IS_VAR_DATA_TYPE(tagType) ? (tagLen + VARSTR_HEADER_SIZE)
+                                                  : (3 + DBL_MANT_DIG - DBL_MIN_EXP + VARSTR_HEADER_SIZE);
       char*   tagVarChar = NULL;
       if (tagData != NULL) {
         tagVarChar = taosMemoryMalloc(bufSize);