diff --git a/source/dnode/vnode/meta/src/metaIdx.c b/source/dnode/vnode/meta/src/metaIdx.c
index 828bd120881fca49fabd2b66ce0e626e8ddc12b2..3da56fc394f382e6235b201ce180ee0abfa674bd 100644
--- a/source/dnode/vnode/meta/src/metaIdx.c
+++ b/source/dnode/vnode/meta/src/metaIdx.c
@@ -49,9 +49,7 @@ int metaOpenIdx(SMeta *pMeta) {
 
 #ifdef USE_INVERTED_INDEX
   SIndexOpts opts;
-  if (indexOpen(&opts, pMeta->path, &pMeta->pIdx->pIdx) != 0) {
-    return -1;
-  }
+  if (indexOpen(&opts, pMeta->path, &pMeta->pIdx->pIdx) != 0) { return -1; }
 
 #endif
   return 0;
@@ -67,16 +65,14 @@ void metaCloseIdx(SMeta *pMeta) { /* TODO */
 
 #ifdef USE_INVERTED_INDEX
   SIndexOpts opts;
-  if (indexClose(pMeta->pIdx->pIdx) != 0) {
-    return -1;
-  }
+  if (indexClose(pMeta->pIdx->pIdx) != 0) { return -1; }
 
 #endif
 }
 
 int metaSaveTableToIdx(SMeta *pMeta, const STbCfg *pTbCfg) {
 #ifdef USE_INVERTED_INDEX
-  if (pTbCfgs - type == META_CHILD_TABLE) {
+  if (pTbCfgs->type == META_CHILD_TABLE) {
     char    buf[8] = {0};
     int16_t colId = (kvRowColIdx(pTbCfg->ctbCfg.pTag))[0].colId;
     sprintf(buf, "%d", colId);  // colname
diff --git a/source/libs/index/src/index.c b/source/libs/index/src/index.c
index 19e93754914dac64076db779b455fa0b5d8dff26..0c222eae1a0b7a72ef252fce4afea9395ca78bf4 100644
--- a/source/libs/index/src/index.c
+++ b/source/libs/index/src/index.c
@@ -59,6 +59,10 @@ static int  indexMergeFinalResults(SArray* interResults, EIndexOperatorType oTyp
 
 static int indexGenTFile(SIndex* index, IndexCache* cache, SArray* batch);
 
+// merge cache and tfile by opera type
+static void indexMergeCacheAndTFile(SArray* result, IterateValue* icache, IterateValue* iTfv);
+static void indexMergeSameKey(SArray* result, TFileValue* tv);
+
 int indexOpen(SIndexOpts* opts, const char* path, SIndex** index) {
   pthread_once(&isInit, indexInit);
   SIndex* sIdx = calloc(1, sizeof(SIndex));
@@ -385,6 +389,27 @@ static void indexMergeSameKey(SArray* result, TFileValue* tv) {
     taosArrayPush(result, &tv);
   }
 }
+static void indexMergeCacheAndTFile(SArray* result, IterateValue* cv, IterateValue* tv) {
+  // opt
+  char* colVal = (cv != NULL) ? cv->colVal : tv->colVal;
+  // design merge-algorithm later, too complicated to handle all kind of situation
+  TFileValue* tfv = tfileValueCreate(colVal);
+  if (cv != NULL) {
+    if (cv->type == ADD_VALUE) {
+      taosArrayAddAll(tfv->tableId, cv->val);
+    } else if (cv->type == DEL_VALUE) {
+    } else if (cv->type == UPDATE_VALUE) {
+    } else {
+      // do nothing
+    }
+  }
+  if (tv != NULL) {
+    // opt later
+    taosArrayAddAll(tfv->tableId, tv->val);
+  }
+
+  indexMergeSameKey(result, tfv);
+}
 static void indexDestroyTempResult(SArray* result) {
   int32_t sz = result ? taosArrayGetSize(result) : 0;
   for (size_t i = 0; i < sz; i++) {
@@ -411,51 +436,30 @@ int indexFlushCacheToTFile(SIndex* sIdx, void* cache) {
 
   bool cn = cacheIter ? cacheIter->next(cacheIter) : false;
   bool tn = tfileIter ? tfileIter->next(tfileIter) : false;
-  while (cn == true && tn == true) {
-    IterateValue* cv = cacheIter->getValue(cacheIter);
-    IterateValue* tv = tfileIter->getValue(tfileIter);
-
-    // dump value
-    int comp = strcmp(cv->colVal, tv->colVal);
+  while (cn == true || tn == true) {
+    IterateValue* cv = (cn == true) ? cacheIter->getValue(cacheIter) : NULL;
+    IterateValue* tv = (tn == true) ? tfileIter->getValue(tfileIter) : NULL;
+
+    int comp = 0;
+    if (cn == true && tn == true) {
+      comp = strcmp(cv->colVal, tv->colVal);
+    } else if (cn == true) {
+      comp = -1;
+    } else {
+      comp = 1;
+    }
     if (comp == 0) {
-      TFileValue* tfv = tfileValueCreate(cv->colVal);
-      taosArrayAddAll(tfv->tableId, cv->val);
-      taosArrayAddAll(tfv->tableId, tv->val);
-      indexMergeSameKey(result, tfv);
-
+      indexMergeCacheAndTFile(result, cv, tv);
       cn = cacheIter->next(cacheIter);
       tn = tfileIter->next(tfileIter);
-      continue;
     } else if (comp < 0) {
-      TFileValue* tfv = tfileValueCreate(cv->colVal);
-      taosArrayAddAll(tfv->tableId, cv->val);
-
-      indexMergeSameKey(result, tfv);
-      // copy to final Result;
+      indexMergeCacheAndTFile(result, cv, NULL);
       cn = cacheIter->next(cacheIter);
     } else {
-      TFileValue* tfv = tfileValueCreate(tv->colVal);
-      taosArrayAddAll(tfv->tableId, tv->val);
-
-      indexMergeSameKey(result, tfv);
-      // copy to final result
+      indexMergeCacheAndTFile(result, NULL, tv);
       tn = tfileIter->next(tfileIter);
     }
   }
-  while (cn == true) {
-    IterateValue* cv = cacheIter->getValue(cacheIter);
-    TFileValue*   tfv = tfileValueCreate(cv->colVal);
-    taosArrayAddAll(tfv->tableId, cv->val);
-    indexMergeSameKey(result, tfv);
-    cn = cacheIter->next(cacheIter);
-  }
-  while (tn == true) {
-    IterateValue* tv = tfileIter->getValue(tfileIter);
-    TFileValue*   tfv = tfileValueCreate(tv->colVal);
-    taosArrayAddAll(tfv->tableId, tv->val);
-    indexMergeSameKey(result, tfv);
-    tn = tfileIter->next(tfileIter);
-  }
   int ret = indexGenTFile(sIdx, pCache, result);
   indexDestroyTempResult(result);
 
@@ -503,7 +507,7 @@ static int indexGenTFile(SIndex* sIdx, IndexCache* cache, SArray* batch) {
   tfileWriterClose(tw);
 
   TFileReader* reader = tfileReaderOpen(sIdx->path, cache->suid, version, cache->colName);
-  if (reader == NULL) { goto END; }
+  if (reader == NULL) { return -1; }
 
   TFileHeader* header = &reader->header;
   ICacheKey    key = {.suid = cache->suid, .colName = header->colName, .nColName = strlen(header->colName)};
diff --git a/source/libs/index/src/index_cache.c b/source/libs/index/src/index_cache.c
index 294c8192e8f030ad59a8a80b18a31d3b6d2715cf..48566a86744e6d68360fdc2c0c682882e6cf6b2d 100644
--- a/source/libs/index/src/index_cache.c
+++ b/source/libs/index/src/index_cache.c
@@ -217,9 +217,9 @@ int indexCachePut(void* cache, SIndexTerm* term, uint64_t uid) {
   // set value
   ct->uid = uid;
   ct->operaType = term->operType;
-
   // ugly code, refactor later
   int64_t estimate = sizeof(ct) + strlen(ct->colVal);
+
   pthread_mutex_lock(&pCache->mtx);
   pCache->occupiedMem += estimate;
   indexCacheMakeRoomForWrite(pCache);
@@ -331,7 +331,6 @@ static char* indexCacheTermGet(const void* pData) {
 static int32_t indexCacheTermCompare(const void* l, const void* r) {
   CacheTerm* lt = (CacheTerm*)l;
   CacheTerm* rt = (CacheTerm*)r;
-
   // compare colVal
   int32_t cmp = strcmp(lt->colVal, rt->colVal);
   if (cmp == 0) { return rt->version - lt->version; }
@@ -359,17 +358,32 @@ static bool indexCacheIteratorNext(Iterate* itera) {
   IterateValue* iv = &itera->val;
   iterateValueDestroy(iv, false);
 
+  // IterateValue* iv = &itera->val;
+  // IterateValue tIterVal = {.colVal = NULL, .val = taosArrayInit(1, sizeof(uint64_t))};
+
   bool next = tSkipListIterNext(iter);
   if (next) {
     SSkipListNode* node = tSkipListIterGet(iter);
     CacheTerm*     ct = (CacheTerm*)SL_GET_NODE_DATA(node);
 
+    // equal func
+    // if (iv->colVal != NULL && ct->colVal != NULL) {
+    //  if (0 == strcmp(iv->colVal, ct->colVal)) { if (iv->type == ADD_VALUE) }
+    //} else {
+    //  tIterVal.colVal = calloc(1, strlen(ct->colVal) + 1);
+    //  tIterval.colVal = tstrdup(ct->colVal);
+    //}
     iv->type = ct->operaType;
-    iv->colVal = calloc(1, strlen(ct->colVal) + 1);
-    memcpy(iv->colVal, ct->colVal, strlen(ct->colVal));
+    iv->colVal = tstrdup(ct->colVal);
+    // iv->colVal = calloc(1, strlen(ct->colVal) + 1);
+    // memcpy(iv->colVal, ct->colVal, strlen(ct->colVal));
 
     taosArrayPush(iv->val, &ct->uid);
   }
+  // IterateValue* iv = &itera->val;
+  // iterateValueDestroy(iv, true);
+  //*iv = tIterVal;
+
   return next;
 }
 
diff --git a/source/libs/index/src/index_fst.c b/source/libs/index/src/index_fst.c
index 4f782cef26a78c9fce89d5ce94f00d516620d0ce..5299a7dc5f5d71dc0308bd8d5f1ed29d3caadfe6 100644
--- a/source/libs/index/src/index_fst.c
+++ b/source/libs/index/src/index_fst.c
@@ -936,6 +936,7 @@ Fst* fstCreate(FstSlice* slice) {
   len -= sizeof(checkSum);
   taosDecodeFixedU32(buf + len, &checkSum);
   if (taosCheckChecksum(buf, len, checkSum)) {
+    indexError("index file is corrupted");
     // verify fst
     return NULL;
   }
diff --git a/source/libs/index/src/index_fst_counting_writer.c b/source/libs/index/src/index_fst_counting_writer.c
index 6db5555aa6ad09586196ba9111d889ead62d6f61..b57f639726c5f738d2ba9d69b3aab74cb6f02dbf 100644
--- a/source/libs/index/src/index_fst_counting_writer.c
+++ b/source/libs/index/src/index_fst_counting_writer.c
@@ -60,9 +60,10 @@ static int writeCtxDoReadFrom(WriterCtx* ctx, uint8_t* buf, int len, int32_t off
   return nRead;
 }
 static int writeCtxGetSize(WriterCtx* ctx) {
-  if (ctx->type == TFile && ctx->file.readOnly) {
-    // refactor later
-    return ctx->file.size;
+  if (ctx->type == TFile) {
+    struct stat fstat;
+    stat(ctx->file.buf, &fstat);
+    return fstat.st_size;
   }
   return 0;
 }
@@ -88,7 +89,7 @@ WriterCtx* writerCtxCreate(WriterType type, const char* path, bool readOnly, int
     if (readOnly == false) {
       // ctx->file.fd = open(path, O_WRONLY | O_CREAT | O_APPEND, S_IRWXU | S_IRWXG | S_IRWXO);
       ctx->file.fd = tfOpenCreateWriteAppend(path);
-
+      tfFtruncate(ctx->file.fd, 0);
       struct stat fstat;
       stat(path, &fstat);
       ctx->file.size = fstat.st_size;
@@ -138,6 +139,11 @@ void writerCtxDestroy(WriterCtx* ctx, bool remove) {
       munmap(ctx->file.ptr, ctx->file.size);
 #endif
     }
+    if (ctx->file.readOnly == false) {
+      struct stat fstat;
+      stat(ctx->file.buf, &fstat);
+      // indexError("write file size: %d", (int)(fstat.st_size));
+    }
     if (remove) { unlink(ctx->file.buf); }
   }
   free(ctx);
diff --git a/source/libs/index/src/index_tfile.c b/source/libs/index/src/index_tfile.c
index 4b764025605f06d2424a96b7a23338f225d106ce..98fede4f7b142132bbf0838762f488b19bd990ec 100644
--- a/source/libs/index/src/index_tfile.c
+++ b/source/libs/index/src/index_tfile.c
@@ -147,21 +147,22 @@ TFileReader* tfileReaderCreate(WriterCtx* ctx) {
   reader->ctx = ctx;
 
   if (0 != tfileReaderVerify(reader)) {
-    tfileReaderDestroy(reader);
     indexError("invalid tfile, suid: %" PRIu64 ", colName: %s", reader->header.suid, reader->header.colName);
+    tfileReaderDestroy(reader);
     return NULL;
   }
   // T_REF_INC(reader);
   if (0 != tfileReaderLoadHeader(reader)) {
-    tfileReaderDestroy(reader);
     indexError("failed to load index header, suid: %" PRIu64 ", colName: %s", reader->header.suid,
                reader->header.colName);
+    tfileReaderDestroy(reader);
     return NULL;
   }
 
   if (0 != tfileReaderLoadFst(reader)) {
+    indexError("failed to load index fst, suid: %" PRIu64 ", colName: %s, errno: %d", reader->header.suid,
+               reader->header.colName, errno);
     tfileReaderDestroy(reader);
-    indexError("failed to load index fst, suid: %" PRIu64 ", colName: %s", reader->header.suid, reader->header.colName);
     return NULL;
   }
 
@@ -303,6 +304,8 @@ int tfileWriterPut(TFileWriter* tw, void* data, bool order) {
     } else {
       // indexInfo("success to write data: %s, offset: %d len: %d", v->colVal, v->offset,
       //          (int)taosArrayGetSize(v->tableId));
+
+      // indexInfo("tfile write data size: %d", tw->ctx->size(tw->ctx));
     }
   }
   fstBuilderFinish(tw->fb);
@@ -485,7 +488,9 @@ static void tfileSerialTableIdsToBuf(char* buf, SArray* ids) {
 static int tfileWriteFstOffset(TFileWriter* tw, int32_t offset) {
   int32_t fstOffset = offset + sizeof(tw->header.fstOffset);
   tw->header.fstOffset = fstOffset;
+
   if (sizeof(fstOffset) != tw->ctx->write(tw->ctx, (char*)&fstOffset, sizeof(fstOffset))) { return -1; }
+  indexInfo("tfile write fst offset: %d", tw->ctx->size(tw->ctx));
   tw->offset += sizeof(fstOffset);
   return 0;
 }
@@ -495,8 +500,11 @@ static int tfileWriteHeader(TFileWriter* writer) {
   TFileHeader* header = &writer->header;
   memcpy(buf, (char*)header, sizeof(buf));
 
+  indexInfo("tfile pre write header size: %d", writer->ctx->size(writer->ctx));
   int nwrite = writer->ctx->write(writer->ctx, buf, sizeof(buf));
   if (sizeof(buf) != nwrite) { return -1; }
+
+  indexInfo("tfile after write header size: %d", writer->ctx->size(writer->ctx));
   writer->offset = nwrite;
   return 0;
 }
@@ -521,6 +529,8 @@ static int tfileWriteFooter(TFileWriter* write) {
   void* pBuf = (void*)buf;
   taosEncodeFixedU64((void**)(void*)&pBuf, tfileMagicNumber);
   int nwrite = write->ctx->write(write->ctx, buf, strlen(buf));
+
+  indexInfo("tfile write footer size: %d", write->ctx->size(write->ctx));
   assert(nwrite == sizeof(tfileMagicNumber));
   return nwrite;
 }