Merge pull request #1138 from taosdata/hzcheng

Add some assert for debug

src/system/detail/src/vnodeCache.c

@@ -966,6 +966,7 @@ void vnodeSetCommitQuery(SMeterObj *pObj, SQuery *pQuery) {
         pObj->vnode, pObj->sid, pObj->meterId, firstKey, pQuery->skey);
     pthread_mutex_lock(&(pVnode->vmutex));
     if (firstKey < pVnode->firstKey) pVnode->firstKey = firstKey;
+    assert(pVnode->firstKey > 0);
     pthread_mutex_unlock(&(pVnode->vmutex));
   }
 }

src/system/detail/src/vnodeMeter.c

@@ -655,6 +655,7 @@ int vnodeInsertPoints(SMeterObj *pObj, char *cont, int contLen, char source, voi
   if (pObj->lastKey > pVnode->lastKey) pVnode->lastKey = pObj->lastKey;
 
   if (firstKey < pVnode->firstKey) pVnode->firstKey = firstKey;
+  assert(pVnode->firstKey > 0);
 
   pVnode->version++;