[TD-6521]<feature> update table meta after altering table schema

src/rpc/src/rpcMain.c

@@ -407,7 +407,7 @@ void rpcSendRequest(void *shandle, const SRpcEpSet *pEpSet, SRpcMsg *pMsg, int64
   if (type == TSDB_MSG_TYPE_QUERY || type == TSDB_MSG_TYPE_CM_RETRIEVE
     || type == TSDB_MSG_TYPE_FETCH || type == TSDB_MSG_TYPE_CM_STABLE_VGROUP
     || type == TSDB_MSG_TYPE_CM_TABLES_META || type == TSDB_MSG_TYPE_CM_TABLE_META
-    || type == TSDB_MSG_TYPE_CM_SHOW || type == TSDB_MSG_TYPE_DM_STATUS)
+    || type == TSDB_MSG_TYPE_CM_SHOW || type == TSDB_MSG_TYPE_DM_STATUS || type == TSDB_MSG_TYPE_CM_ALTER_TABLE)
     pContext->connType = RPC_CONN_TCPC;
 
   pContext->rid = taosAddRef(tsRpcRefId, pContext);