[TD-674] defect found in coverity scan

src/client/inc/tsclient.h

@@ -405,6 +405,7 @@ void tscKillSTableQuery(SSqlObj *pSql);
 void tscInitResObjForLocalQuery(SSqlObj *pObj, int32_t numOfRes, int32_t rowLen);
 bool tscIsUpdateQuery(SSqlObj* pSql);
 bool tscHasReachLimitation(SQueryInfo *pQueryInfo, SSqlRes *pRes);
+bool tscResultsetFetchCompleted(TAOS_RES *result);
 
 char *tscGetErrorMsgPayload(SSqlCmd *pCmd);
 

src/client/src/tscUtil.c

@@ -1942,6 +1942,11 @@ bool tscHasReachLimitation(SQueryInfo* pQueryInfo, SSqlRes* pRes) {
   return (pQueryInfo->clauseLimit > 0 && pRes->numOfClauseTotal >= pQueryInfo->clauseLimit);
 }
 
+bool tscResultsetFetchCompleted(TAOS_RES *result) {
+  SSqlRes* pRes = result;
+  return pRes->completed; 
+}
+
 char* tscGetErrorMsgPayload(SSqlCmd* pCmd) { return pCmd->payload; }
 
 /**

src/mnode/src/mnodeShow.c

@@ -65,7 +65,7 @@ int32_t mnodeInitShow() {
   mnodeAddReadMsgHandle(TSDB_MSG_TYPE_CM_CONNECT, mnodeProcessConnectMsg);
   mnodeAddReadMsgHandle(TSDB_MSG_TYPE_CM_USE_DB, mnodeProcessUseMsg);
   
-  tsMnodeShowCache = taosCacheInitWithCb(10, mnodeFreeShowObj);
+  tsMnodeShowCache = taosCacheInitWithCb(5, mnodeFreeShowObj);
   return 0;
 }
 
@@ -139,7 +139,7 @@ static int32_t mnodeProcessShowMsg(SMnodeMsg *pMsg) {
   pShowRsp->qhandle = htobe64((uint64_t) pShow);
 
   int32_t code = (*tsMnodeShowMetaFp[pShowMsg->type])(&pShowRsp->tableMeta, pShow, pMsg->rpcMsg.handle);
-  mTrace("%p, show type:%s index:%d, get meta finished, rows:%d cols:%d result:%s", pShow,
+  mTrace("%p, show type:%s index:%d, get meta finished, numOfRows:%d cols:%d result:%s", pShow,
          mnodeGetShowType(pShowMsg->type), pShow->index, pShow->numOfRows, pShow->numOfColumns, tstrerror(code));
 
   if (code == TSDB_CODE_SUCCESS) {
@@ -219,8 +219,10 @@ static int32_t mnodeProcessRetrieveMsg(SMnodeMsg *pMsg) {
 
   if (rowsToRead == 0 || (rowsRead == rowsToRead && pShow->numOfRows == pShow->numOfReads)) {
     pRsp->completed = 1;
+    mTrace("%p, retrieve completed", pShow);
     mnodeReleaseShowObj(pShow, true);
   } else {
+    mTrace("%p, retrieve not completed yet", pShow);
     mnodeReleaseShowObj(pShow, false);
   }
 
@@ -379,10 +381,10 @@ static void *mnodePutShowObj(SShowObj *pShow, int32_t size) {
     pShow->index = atomic_add_fetch_32(&tsShowObjIndex, 1);
     sprintf(key, "%d", pShow->index);
 
-    SShowObj *newQhandle = taosCachePut(tsMnodeShowCache, key, pShow, size, 60);
+    SShowObj *newQhandle = taosCachePut(tsMnodeShowCache, key, pShow, size, 6);
     free(pShow);
 
-    mTrace("%p, show is put into cache", newQhandle);
+    mTrace("%p, show is put into cache, index:%s", newQhandle, key);
     return newQhandle;
   }
 

src/plugins/http/src/httpSql.c

@@ -205,6 +205,10 @@ void httpProcessSingleSqlRetrieveCallBack(void *param, TAOS_RES *result, int num
     }
   }
 
+  if (tscResultsetFetchCompleted(result)) {
+    isContinue = false;
+  }
+
   if (isContinue) {
     // retrieve next batch of rows
     httpTrace("context:%p, fd:%d, ip:%s, user:%s, continue retrieve, numOfRows:%d", pContext, pContext->fd,

src/plugins/http/src/tgHandle.c

@@ -269,14 +269,20 @@ int tgReadSchema(char *fileName) {
   httpPrint("open telegraf schema file:%s success", fileName);
   fseek(fp, 0, SEEK_END);
   int32_t contentSize = (int32_t)ftell(fp);
+  if (contentSize <= 0) {
+    fclose(fp);
+    return 0;
+  }
+
   rewind(fp);
   char *  content = (char *)calloc(contentSize + 1, 1);
   int32_t result = fread(content, 1, contentSize, fp);
+  
   if (result != contentSize) {
     httpError("failed to read telegraf schema file:%s", fileName);
     fclose(fp);
     free(content);
-    return -1;
+    return 0;
   }
 
   content[contentSize] = 0;

tests/script/general/parser/limit2.sim

@@ -69,8 +69,6 @@ print ====== tables created
 
 print ================== restart server to commit data into disk
 system sh/exec.sh -n dnode1 -s stop -x SIGINT
-
-return
 sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed

tests/tsim/src/simExe.c

@@ -652,6 +652,7 @@ bool simExecuteNativeSqlCommand(SScript *script, char *rest, bool isSlow) {
 
       if (line->errorJump == SQL_JUMP_TRUE) {
         script->linePos = line->jump;
+        taos_free_result(pSql);
         return true;
       }
       taosMsleep(1000);