fix:error in group by tag

source/libs/executor/src/executil.c

@@ -595,7 +595,8 @@ static int32_t setSelectValueColumnInfo(SqlFunctionCtx* pCtx, int32_t numOfOutpu
   }
 
   for (int32_t i = 0; i < numOfOutput; ++i) {
-    if (strcmp(pCtx[i].pExpr->pExpr->_function.functionName, "_select_value") == 0) {
+    if (strcmp(pCtx[i].pExpr->pExpr->_function.functionName, "_select_value") == 0 ||
+        strcmp(pCtx[i].pExpr->pExpr->_function.functionName, "_group_key") == 0) {
       pValCtx[num++] = &pCtx[i];
     } else if (fmIsSelectFunc(pCtx[i].functionId)) {
       p = &pCtx[i];

source/libs/function/src/builtins.c

@@ -2517,7 +2517,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
   {
     .name = "_group_key",
     .type = FUNCTION_TYPE_GROUP_KEY,
-    .classification = FUNC_MGT_AGG_FUNC,
+    .classification = FUNC_MGT_AGG_FUNC | FUNC_MGT_SELECT_FUNC,
     .translateFunc = translateGroupKey,
     .getEnvFunc   = getGroupKeyFuncEnv,
     .initFunc     = functionSetup,

source/libs/function/src/builtinsimpl.c

@@ -1485,6 +1485,8 @@ void setSelectivityValue(SqlFunctionCtx* pCtx, SSDataBlock* pBlock, const STuple
         colDataAppend(pDstCol, rowIndex, (pStart + ps), false);
       }
     }
+
+    releaseBufPage(pCtx->pBuf, pPage);
   }
 }