refactor(tmq): add debug log

source/dnode/mnode/impl/src/mndSubscribe.c

@@ -944,6 +944,8 @@ static int32_t mndRetrieveSubscribe(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock
   int32_t          numOfRows = 0;
   SMqSubscribeObj *pSub = NULL;
 
+  mDebug("mnd show subscriptions begin");
+
   while (numOfRows < rowsCapacity) {
     pShow->pIter = sdbFetch(pSdb, SDB_SUBSCRIBE, pShow->pIter, (void **)&pSub);
     if (pShow->pIter == NULL) break;
@@ -989,6 +991,9 @@ static int32_t mndRetrieveSubscribe(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock
         pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
         colDataAppend(pColInfo, numOfRows, (const char *)&pConsumerEp->consumerId, false);
 
+        mDebug("mnd show subscrptions: topic %s, consumer %" PRId64 "cgroup %s vgid %d", varDataVal(topic),
+               pConsumerEp->consumerId, varDataVal(cgroup), pVgEp->vgId);
+
         // offset
 #if 0
       // subscribe time
@@ -1034,6 +1039,9 @@ static int32_t mndRetrieveSubscribe(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock
       pColInfo = taosArrayGet(pBlock->pDataBlock, cols++);
       colDataAppend(pColInfo, numOfRows, NULL, true);
 
+      mDebug("mnd show subscrptions(unassigned): topic %s, cgroup %s vgid %d", varDataVal(topic), varDataVal(cgroup),
+             pVgEp->vgId);
+
       // offset
 #if 0
       // subscribe time
@@ -1053,6 +1061,8 @@ static int32_t mndRetrieveSubscribe(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock
     sdbRelease(pSdb, pSub);
   }
 
+  mDebug("mnd end show subscriptions");
+
   pShow->numOfRows += numOfRows;
   return numOfRows;
 }