tsdbCache/delete: load delete data only del file exists

source/dnode/vnode/src/tsdb/tsdbCache.c

@@ -595,8 +595,12 @@ static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, STSRow **ppRow) {
 
   *ppRow = NULL;
 
-  SDelFReader *pDelFReader;
+  SArray *pSkyline = taosArrayInit(32, sizeof(TSDBKEY));
+
   SDelFile *pDelFile = tsdbFSStateGetDelFile(pTsdb->fs->cState);
+  if (pDelFile) {
+    SDelFReader *pDelFReader;
+
     code = tsdbDelFReaderOpen(&pDelFReader, pDelFile, pTsdb, NULL);
     if (code) goto _err;
 
@@ -604,13 +608,13 @@ static int32_t mergeLastRow(tb_uid_t uid, STsdb *pTsdb, STSRow **ppRow) {
     code = getTableDelIdx(pDelFReader, suid, uid, &delIdx);
     if (code) goto _err;
 
-  SArray *pSkyline = taosArrayInit(32, sizeof(TSDBKEY));
     code = getTableDelSkyline(pMem, pIMem, pDelFReader, &delIdx, pSkyline);
     if (code) goto _err;
 
-  int iSkyline = taosArrayGetSize(pSkyline) - 1;
-
     tsdbDelFReaderClose(pDelFReader);
+  }
+
+  int iSkyline = taosArrayGetSize(pSkyline) - 1;
 
   SBlockIdx idx = {.suid = suid, .uid = uid};