add checkpoint

source/dnode/vnode/src/tq/tqStreamTaskSnap.c

@@ -45,7 +45,7 @@ int32_t streamTaskSnapReaderOpen(STQ* pTq, int64_t sver, int64_t ever, SStreamTa
   pReader->pTq = pTq;
   pReader->sver = sver;
   pReader->ever = ever;
-  pReader->tdbTbList = taosArrayInit(4, sizeof(void*));
+  pReader->tdbTbList = taosArrayInit(4, sizeof(STablePair));
 
   STablePair pair1 = {.tbl = pTq->pStreamMeta->pTaskDb, .type = SNAP_DATA_STREAM_TASK};
   taosArrayPush(pReader->tdbTbList, &pair1);
@@ -58,12 +58,16 @@ int32_t streamTaskSnapReaderOpen(STQ* pTq, int64_t sver, int64_t ever, SStreamTa
   STablePair* pPair = taosArrayGet(pReader->tdbTbList, pReader->pos);
   code = tdbTbcOpen(pPair->tbl, &pReader->pCur, NULL);
   if (code) {
+    tqInfo("vgId:%d, vnode stream-task snapshot reader failed to open, reason: %s", TD_VID(pTq->pVnode),
+           tstrerror(code));
     taosMemoryFree(pReader);
     goto _err;
   }
 
   code = tdbTbcMoveToFirst(pReader->pCur);
   if (code) {
+    tqInfo("vgId:%d, vnode stream-task snapshot reader failed to iterate, reason: %s", TD_VID(pTq->pVnode),
+           tstrerror(code));
     taosMemoryFree(pReader);
     goto _err;
   }
@@ -71,6 +75,7 @@ int32_t streamTaskSnapReaderOpen(STQ* pTq, int64_t sver, int64_t ever, SStreamTa
   tqInfo("vgId:%d, vnode stream-task snapshot reader opened", TD_VID(pTq->pVnode));
 
   *ppReader = pReader;
+  return code;
 
 _err:
   tqError("vgId:%d, vnode stream-task snapshot reader open failed since %s", TD_VID(pTq->pVnode), tstrerror(code));