diff --git a/source/libs/index/inc/indexInt.h b/source/libs/index/inc/indexInt.h
index 6e1256d857..378af4c1d1 100644
--- a/source/libs/index/inc/indexInt.h
+++ b/source/libs/index/inc/indexInt.h
@@ -115,7 +115,7 @@ typedef struct TFileCacheKey {
   int32_t  nColName;
 } ICacheKey;
 
-int indexFlushCacheTFile(SIndex* sIdx, void*);
+int indexFlushCacheToTFile(SIndex* sIdx, void*);
 
 int32_t indexSerialCacheKey(ICacheKey* key, char* buf);
 
diff --git a/source/libs/index/inc/index_cache.h b/source/libs/index/inc/index_cache.h
index 544849ff2f..9db913debf 100644
--- a/source/libs/index/inc/index_cache.h
+++ b/source/libs/index/inc/index_cache.h
@@ -21,9 +21,8 @@
 #include "tskiplist.h"
 // ----------------- key structure in skiplist ---------------------
 
-/* A data row, the format is like below:
- * content: |<--totalLen-->|<-- value len--->|<-- value -->|<--uid -->|<--version--->|<-- itermType -->|
- *  len :   |<--int32_t -->|<--- int32_t --->|<--valuelen->|<--uint64_t->|<-- int32_t-->|<-- int8_t --->|
+/* A data row, the format is like below
+ * content: |<---colVal---->|<-- version--->|<-- uid--->|<-- colType --->|<--operaType--->|
  */
 
 #ifdef __cplusplus
diff --git a/source/libs/index/src/index.c b/source/libs/index/src/index.c
index 0bf30d6efa..d0b8fa4290 100644
--- a/source/libs/index/src/index.c
+++ b/source/libs/index/src/index.c
@@ -384,7 +384,6 @@ static void indexMergeSameKey(SArray* result, TFileValue* tv) {
     }
   } else {
     taosArrayPush(result, &tv);
-    // indexError("merge colVal: %s", tv->colVal);
   }
 }
 static void indexDestroyTempResult(SArray* result) {
@@ -395,7 +394,7 @@ static void indexDestroyTempResult(SArray* result) {
   }
   taosArrayDestroy(result);
 }
-int indexFlushCacheTFile(SIndex* sIdx, void* cache) {
+int indexFlushCacheToTFile(SIndex* sIdx, void* cache) {
   if (sIdx == NULL) { return -1; }
   indexInfo("suid %" PRIu64 " merge cache into tindex", sIdx->suid);
 
diff --git a/source/libs/index/src/index_cache.c b/source/libs/index/src/index_cache.c
index 85e4c98276..8bc3776ed9 100644
--- a/source/libs/index/src/index_cache.c
+++ b/source/libs/index/src/index_cache.c
@@ -45,9 +45,7 @@ IndexCache* indexCacheCreate(SIndex* idx, uint64_t suid, const char* colName, in
     return NULL;
   };
   cache->mem = indexInternalCacheCreate(type);
-
-  cache->colName = calloc(1, strlen(colName) + 1);
-  memcpy(cache->colName, colName, strlen(colName));
+  cache->colName = tstrdup(colName);
   cache->type = type;
   cache->index = idx;
   cache->version = 0;
@@ -187,8 +185,8 @@ static void indexCacheMakeRoomForWrite(IndexCache* cache) {
       break;
     } else if (cache->imm != NULL) {
       // TODO: wake up by condition variable
-      // pthread_mutex_unlock(&cache->mtx);
       pthread_cond_wait(&cache->finished, &cache->mtx);
+      // pthread_mutex_unlock(&cache->mtx);
       // taosMsleep(50);
       // pthread_mutex_lock(&cache->mtx);
     } else {
@@ -353,7 +351,7 @@ static MemTable* indexInternalCacheCreate(int8_t type) {
 static void doMergeWork(SSchedMsg* msg) {
   IndexCache* pCache = msg->ahandle;
   SIndex*     sidx = (SIndex*)pCache->index;
-  indexFlushCacheTFile(sidx, pCache);
+  indexFlushCacheToTFile(sidx, pCache);
 }
 static bool indexCacheIteratorNext(Iterate* itera) {
   SSkipListIterator* iter = itera->iter;
diff --git a/source/libs/index/src/index_fst_counting_writer.c b/source/libs/index/src/index_fst_counting_writer.c
index 260c1708cb..0763aae857 100644
--- a/source/libs/index/src/index_fst_counting_writer.c
+++ b/source/libs/index/src/index_fst_counting_writer.c
@@ -18,8 +18,6 @@
 #include "tutil.h"
 
 static int writeCtxDoWrite(WriterCtx* ctx, uint8_t* buf, int len) {
-  // if (ctx->offset + len > ctx->limit) { return -1; }
-
   if (ctx->type == TFile) {
     assert(len == tfWrite(ctx->file.fd, buf, len));
   } else {