[td-225] refactor shell code to support ctrl+c.

src/client/src/tscServer.c

@@ -455,35 +455,20 @@ void tscKillSTableQuery(SSqlObj *pSql) {
   }
 
   for (int i = 0; i < pSql->numOfSubs; ++i) {
+    // NOTE: pSub may have been released already here
     SSqlObj *pSub = pSql->pSubs[i];
     if (pSub == NULL) {
       continue;
     }
 
+    pSub->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
     if (pSub->pRpcCtx != NULL) {
       rpcCancelRequest(pSub->pRpcCtx);
     }
 
-    pSub->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
     tscQueueAsyncRes(pSub);
   }
 
-  /*
-   * 1. if the subqueries are not launched or partially launched, we need to waiting the launched
-   * query return to successfully free allocated resources.
-   * 2. if no any subqueries are launched yet, which means the super table query only in parse sql stage,
-   * set the res.code, and return.
-   */
-  const int64_t MAX_WAITING_TIME = 10000;  // 10 Sec.
-  int64_t       stime = taosGetTimestampMs();
-
-  while (pCmd->command != TSDB_SQL_RETRIEVE_LOCALMERGE && pCmd->command != TSDB_SQL_RETRIEVE_EMPTY_RESULT) {
-    taosMsleep(100);
-    if (taosGetTimestampMs() - stime > MAX_WAITING_TIME) {
-      break;
-    }
-  }
-
   tscDebug("%p super table query cancelled", pSql);
 }
 

src/client/src/tscSql.c

@@ -669,15 +669,19 @@ void taos_stop_query(TAOS_RES *res) {
   // It may have been released by the other thread already.
   // The ref count may fix this problem.
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
-  if (tscIsTwoStageSTableQuery(pQueryInfo, 0)) {
-    tscKillSTableQuery(pSql);
-  }
 
+  // set the error code for master pSqlObj firstly
+  pSql->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
+
+  if (tscIsTwoStageSTableQuery(pQueryInfo, 0)) {
+    assert(pSql->pRpcCtx == NULL);
+    tscKillSTableQuery(pSql);
+  } else {
     if (pSql->cmd.command < TSDB_SQL_LOCAL) {
       rpcCancelRequest(pSql->pRpcCtx);
     }
+  }
 
-  pSql->res.code = TSDB_CODE_TSC_QUERY_CANCELLED;
   tscDebug("%p query is cancelled", res);
 }
 

src/client/src/tscSubquery.c

@@ -1463,9 +1463,14 @@ int32_t tscHandleMasterSTableQuery(SSqlObj *pSql) {
 static void tscFreeSubSqlObj(SRetrieveSupport *trsupport, SSqlObj *pSql) {
   tscDebug("%p start to free subquery result", pSql);
 
+  int32_t  index = trsupport->subqueryIndex;
+  SSqlObj *pParentSql = trsupport->pParentSql;
+
+  assert(pSql == pParentSql->pSubs[index]);
+  pParentSql->pSubs[index] = NULL;
+
   taos_free_result(pSql);
   taosTFree(trsupport->localBuffer);
-  
   taosTFree(trsupport);
 }
 
@@ -1474,17 +1479,7 @@ static void tscHandleSubqueryError(SRetrieveSupport *trsupport, SSqlObj *pSql, i
 
 static void tscAbortFurtherRetryRetrieval(SRetrieveSupport *trsupport, TAOS_RES *tres, int32_t code) {
 // set no disk space error info
-#ifdef WINDOWS
-  LPVOID lpMsgBuf;
-  FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL,
-                GetLastError(), MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),  // Default language
-                (LPTSTR)&lpMsgBuf, 0, NULL);
-  tscError("sub:%p failed to flush data to disk:reason:%s", tres, lpMsgBuf);
-  LocalFree(lpMsgBuf);
-#else
   tscError("sub:%p failed to flush data to disk, reason:%s", tres, tstrerror(code));
-#endif
-
   SSqlObj* pParentSql = trsupport->pParentSql;
 
   pParentSql->res.code = code;
@@ -1548,14 +1543,14 @@ void tscHandleSubqueryError(SRetrieveSupport *trsupport, SSqlObj *pSql, int numO
      */
     pSql->res.numOfRows = 0;
     trsupport->numOfRetry = MAX_NUM_OF_SUBQUERY_RETRY;  // disable retry efforts
-    tscDebug("%p query is cancelled, sub:%p, orderOfSub:%d abort retrieve, code:%d", pParentSql, pSql,
+    tscDebug("%p query is cancelled, sub:%p, orderOfSub:%d abort retrieve, code:%s", pParentSql, pSql,
-             subqueryIndex, pParentSql->res.code);
+             subqueryIndex, tstrerror(pParentSql->res.code));
   }
 
   if (numOfRows >= 0) {  // current query is successful, but other sub query failed, still abort current query.
     tscDebug("%p sub:%p retrieve numOfRows:%d,orderOfSub:%d", pParentSql, pSql, numOfRows, subqueryIndex);
-    tscError("%p sub:%p abort further retrieval due to other queries failure,orderOfSub:%d,code:%d", pParentSql, pSql,
+    tscError("%p sub:%p abort further retrieval due to other queries failure,orderOfSub:%d,code:%s", pParentSql, pSql,
-             subqueryIndex, pParentSql->res.code);
+             subqueryIndex, tstrerror(pParentSql->res.code));
   } else {
     if (trsupport->numOfRetry++ < MAX_NUM_OF_SUBQUERY_RETRY && pParentSql->res.code == TSDB_CODE_SUCCESS) {
       if (tscReissueSubquery(trsupport, pSql, numOfRows) == TSDB_CODE_SUCCESS) {