cq support continue query from last stop time

src/client/inc/tsclient.h

@@ -422,6 +422,7 @@ typedef struct SSqlStream {
   int64_t ctime;     // stream created time
   int64_t stime;     // stream next executed time
   int64_t etime;     // stream end query time, when time is larger then etime, the stream will be closed
+  int64_t ltime;     // stream last row time in stream table
   SInterval interval;
   void *  pTimer;
 

src/client/src/tscStream.c

@@ -538,12 +538,11 @@ static int64_t tscGetLaunchTimestamp(const SSqlStream *pStream) {
   
   return (pStream->precision == TSDB_TIME_PRECISION_MICRO) ? timer / 1000L : timer;
 }
-
+///*
 //
 // get tableName last row time, if have error return zero.
 //
 static int64_t tscGetStreamTableLastTime(SSqlObj* pSql, SSqlStream* pStream, const char* tableName) {
-
   int64_t last_time = 0;
   char sql[128] = "";
   sprintf(sql, "select last_row(*) from %s;", tableName); 
@@ -555,7 +554,7 @@ static int64_t tscGetStreamTableLastTime(SSqlObj* pSql, SSqlStream* pStream, con
   
   // only fetch one row
   TAOS_ROW row = taos_fetch_row(res);
-  if( row[0] ) {
+  if( row && row[0] ) {
     last_time = *((int64_t*)row[0]);
   }
 
@@ -563,7 +562,7 @@ static int64_t tscGetStreamTableLastTime(SSqlObj* pSql, SSqlStream* pStream, con
   taos_free_result(res);
   return last_time;
 }
-
+//*/
 static void tscCreateStream(void *param, TAOS_RES *res, int code) {
   SSqlStream* pStream = (SSqlStream*)param;
   SSqlObj* pSql = pStream->pSql;
@@ -597,10 +596,14 @@ static void tscCreateStream(void *param, TAOS_RES *res, int code) {
 
   pStream->stime = tscGetStreamStartTimestamp(pSql, pStream, pStream->stime);
 
-  // set output table last record time to stime if have, why do this, because continue with last break
+  // set output table last record time to stime if have, why do this, because continue with last brea
-  int64_t last_time = tscGetStreamTableLastTime(pSql, pStream, pStream->dstTable);
+  const char* dstTable = pStream->dstTable? pStream->dstTable: "";
+  int64_t last_time = tscGetStreamTableLastTime(pSql, pStream, dstTable);
+  pStream->ltime = last_time;
+  tscDebug(" CQ get table=%s lasttime=%"PRId64" end.", dstTable, last_time);
   if(last_time > 0 && last_time > pStream->stime) {
     // can replace stime with last row time
+    tscDebug(" CQ set table %s stime=%"PRId64" with lasttime=%"PRId64"  ", dstTable, pStream->stime, last_time);
     pStream->stime = last_time;
   }
 
@@ -619,6 +622,24 @@ void tscSetStreamDestTable(SSqlStream* pStream, const char* dstTable) {
   pStream->dstTable = dstTable;
 }
 
+// already run on another thread
+void tscCreateStreamThread(SSchedMsg* pMsg) {
+  tscDebug(" new thread Sched call tscCreateStream begin...");
+  tscCreateStream(pMsg->ahandle, NULL, 0);
+  tscDebug(" new thread Sched call tscCreateStream end.");
+  return ;
+}
+
+//  parsesql async response return and change run thread
+void tsParseSqlRet(void* param, TAOS_RES* res, int code) {
+    SSchedMsg schedMsg = { 0 };
+    schedMsg.fp = tscCreateStreamThread;
+    schedMsg.ahandle = param;
+    schedMsg.thandle = res;
+    schedMsg.msg = NULL;
+    taosScheduleTask(tscQhandle, &schedMsg);
+}
+
 TAOS_STREAM *taos_open_stream(TAOS *taos, const char *sqlstr, void (*fp)(void *param, TAOS_RES *, TAOS_ROW row),
                               int64_t stime, void *param, void (*callback)(void *)) {
   STscObj *pObj = (STscObj *)taos;
@@ -664,15 +685,17 @@ TAOS_STREAM *taos_open_stream(TAOS *taos, const char *sqlstr, void (*fp)(void *p
   tscDebugL("%p SQL: %s", pSql, pSql->sqlstr);
   tsem_init(&pSql->rspSem, 0, 0);
 
-  pSql->fp = tscCreateStream;
+  pSql->fp      = tsParseSqlRet;
-  pSql->fetchFp = tscCreateStream;
+  pSql->fetchFp = tsParseSqlRet;
 
   registerSqlObj(pSql);
   
   int32_t code = tsParseSql(pSql, true);
   if (code == TSDB_CODE_SUCCESS) {
     tscCreateStream(pStream, pSql, code);
-  } else if (code != TSDB_CODE_TSC_ACTION_IN_PROGRESS) {
+  } else if (code == TSDB_CODE_TSC_ACTION_IN_PROGRESS) {
+     tscDebug(" cq parseSql IN Process pass. ");
+  } else {
     tscError("0x%"PRIx64" open stream failed, sql:%s, code:%s", pSql->self, sqlstr, tstrerror(code));
     taosReleaseRef(tscObjRef, pSql->self);
     free(pStream);