diff --git a/source/libs/index/inc/index_cache.h b/source/libs/index/inc/index_cache.h
index 679de3c0a5..12b66bca2c 100644
--- a/source/libs/index/inc/index_cache.h
+++ b/source/libs/index/inc/index_cache.h
@@ -49,7 +49,6 @@ typedef struct IndexCache {
 #define CACHE_VERSION(cache) atomic_load_32(&cache->version)
 typedef struct CacheTerm {
   // key
-  int32_t nColVal;
   char*   colVal;
   int32_t version;
   // value
diff --git a/source/libs/index/src/index.c b/source/libs/index/src/index.c
index 61f03547c0..b78c4ff258 100644
--- a/source/libs/index/src/index.c
+++ b/source/libs/index/src/index.c
@@ -227,14 +227,15 @@ SIndexOpts* indexOptsCreate() {
 #endif
   return NULL;
 }
-void indexOptsDestroy(SIndexOpts* opts){
+void indexOptsDestroy(SIndexOpts* opts) {
 #ifdef USE_LUCENE
 #endif
-} /*
-   * @param: oper
-   *
-   */
-
+  return;
+}
+/*
+ * @param: oper
+ *
+ */
 SIndexMultiTermQuery* indexMultiTermQueryCreate(EIndexOperatorType opera) {
   SIndexMultiTermQuery* p = (SIndexMultiTermQuery*)malloc(sizeof(SIndexMultiTermQuery));
   if (p == NULL) {
@@ -403,7 +404,6 @@ int indexFlushCacheTFile(SIndex* sIdx, void* cache) {
       TFileValue* tfv = tfileValueCreate(cv->colVal);
       taosArrayAddAll(tfv->tableId, cv->val);
       taosArrayPush(result, &tfv);
-
       // copy to final Result;
       cn = cacheIter->next(cacheIter);
     } else {
diff --git a/source/libs/index/src/index_cache.c b/source/libs/index/src/index_cache.c
index f610ff9a11..217545d23b 100644
--- a/source/libs/index/src/index_cache.c
+++ b/source/libs/index/src/index_cache.c
@@ -23,21 +23,21 @@
 #define MEM_TERM_LIMIT 1000000
 // ref index_cache.h:22
 //#define CACHE_KEY_LEN(p) \
-//  (sizeof(int32_t) + sizeof(uint16_t) + sizeof(p->colType) + sizeof(p->nColVal) + p->nColVal + sizeof(uint64_t) + sizeof(p->operType))
+//  (sizeof(int32_t) + sizeof(uint16_t) + sizeof(p->colType) + sizeof(p->nColVal) + p->nColVal + sizeof(uint64_t) +
+//  sizeof(p->operType))
 
-void indexMemRef(MemTable* tbl);
-void indexMemUnRef(MemTable* tbl);
+static void indexMemRef(MemTable* tbl);
+static void indexMemUnRef(MemTable* tbl);
 
-void indexCacheRef(IndexCache* cache);
-void indexCacheUnRef(IndexCache* cache);
+static void    cacheTermDestroy(CacheTerm* ct);
+static char*   getIndexKey(const void* pData);
+static int32_t compareKey(const void* l, const void* r);
 
-static void      cacheTermDestroy(CacheTerm* ct);
-static char*     getIndexKey(const void* pData);
-static int32_t   compareKey(const void* l, const void* r);
 static MemTable* indexInternalCacheCreate(int8_t type);
 
-static void          doMergeWork(SSchedMsg* msg);
-static bool          indexCacheIteratorNext(Iterate* itera);
+static void doMergeWork(SSchedMsg* msg);
+static bool indexCacheIteratorNext(Iterate* itera);
+
 static IterateValue* indexCacheIteratorGetValue(Iterate* iter);
 
 IndexCache* indexCacheCreate(SIndex* idx, const char* colName, int8_t type) {
@@ -86,7 +86,8 @@ void indexCacheDestroySkiplist(SSkipList* slt) {
   while (tSkipListIterNext(iter)) {
     SSkipListNode* node = tSkipListIterGet(iter);
     CacheTerm*     ct = (CacheTerm*)SL_GET_NODE_DATA(node);
-    if (ct != NULL) {}
+    if (ct != NULL) {
+    }
   }
   tSkipListDestroyIter(iter);
   tSkipListDestroy(slt);
@@ -101,7 +102,9 @@ void indexCacheDestroyImm(IndexCache* cache) {
 }
 void indexCacheDestroy(void* cache) {
   IndexCache* pCache = cache;
-  if (pCache == NULL) { return; }
+  if (pCache == NULL) {
+    return;
+  }
   indexMemUnRef(pCache->mem);
   indexMemUnRef(pCache->imm);
   free(pCache->colName);
@@ -111,7 +114,9 @@ void indexCacheDestroy(void* cache) {
 
 Iterate* indexCacheIteratorCreate(IndexCache* cache) {
   Iterate* iiter = calloc(1, sizeof(Iterate));
-  if (iiter == NULL) { return NULL; }
+  if (iiter == NULL) {
+    return NULL;
+  }
 
   MemTable* tbl = cache->imm;
   iiter->val.val = taosArrayInit(1, sizeof(uint64_t));
@@ -122,8 +127,9 @@ Iterate* indexCacheIteratorCreate(IndexCache* cache) {
   return iiter;
 }
 void indexCacheIteratorDestroy(Iterate* iter) {
-  if (iter == NULL) { return; }
-
+  if (iter == NULL) {
+    return;
+  }
   tSkipListDestroyIter(iter->iter);
   iterateValueDestroy(&iter->val, true);
   free(iter);
@@ -160,18 +166,21 @@ static void indexCacheMakeRoomForWrite(IndexCache* cache) {
 }
 
 int indexCachePut(void* cache, SIndexTerm* term, uint64_t uid) {
-  if (cache == NULL) { return -1; }
+  if (cache == NULL) {
+    return -1;
+  }
 
   IndexCache* pCache = cache;
   indexCacheRef(pCache);
   // encode data
   CacheTerm* ct = calloc(1, sizeof(CacheTerm));
-  if (cache == NULL) { return -1; }
+  if (cache == NULL) {
+    return -1;
+  }
   // set up key
   ct->colType = term->colType;
-  ct->nColVal = term->nColVal;
-  ct->colVal = (char*)calloc(1, sizeof(char) * (ct->nColVal + 1));
-  memcpy(ct->colVal, term->colVal, ct->nColVal);
+  ct->colVal = (char*)calloc(1, sizeof(char) * (term->nColVal + 1));
+  memcpy(ct->colVal, term->colVal, term->nColVal);
   ct->version = atomic_add_fetch_32(&pCache->version, 1);
   // set value
   ct->uid = uid;
@@ -197,7 +206,9 @@ int indexCacheDel(void* cache, const char* fieldValue, int32_t fvlen, uint64_t u
   return 0;
 }
 int indexCacheSearch(void* cache, SIndexTermQuery* query, SArray* result, STermValueType* s) {
-  if (cache == NULL) { return -1; }
+  if (cache == NULL) {
+    return -1;
+  }
   IndexCache*     pCache = cache;
   SIndexTerm*     term = query->term;
   EIndexQueryType qtype = query->qType;
@@ -211,10 +222,11 @@ int indexCacheSearch(void* cache, SIndexTermQuery* query, SArray* result, STermV
   pthread_mutex_unlock(&pCache->mtx);
 
   CacheTerm* ct = calloc(1, sizeof(CacheTerm));
-  if (ct == NULL) { return -1; }
-  ct->nColVal = term->nColVal;
-  ct->colVal = calloc(1, sizeof(char) * (ct->nColVal + 1));
-  memcpy(ct->colVal, term->colVal, ct->nColVal);
+  if (ct == NULL) {
+    return -1;
+  }
+  ct->colVal = calloc(1, sizeof(char) * (term->nColVal + 1));
+  memcpy(ct->colVal, term->colVal, term->nColVal);
   ct->version = atomic_load_32(&pCache->version);
 
   char* key = getIndexKey(ct);
@@ -225,7 +237,7 @@ int indexCacheSearch(void* cache, SIndexTermQuery* query, SArray* result, STermV
     if (node != NULL) {
       CacheTerm* c = (CacheTerm*)SL_GET_NODE_DATA(node);
       if (c->operaType == ADD_VALUE || qtype == QUERY_TERM) {
-        if (c->nColVal == ct->nColVal && strncmp(c->colVal, ct->colVal, c->nColVal) == 0) {
+        if (strcmp(c->colVal, ct->colVal) == 0) {
           taosArrayPush(result, &c->uid);
           *s = kTypeValue;
         } else {
@@ -257,26 +269,33 @@ int indexCacheSearch(void* cache, SIndexTermQuery* query, SArray* result, STermV
 }
 
 void indexCacheRef(IndexCache* cache) {
-  if (cache == NULL) { return; }
-
+  if (cache == NULL) {
+    return;
+  }
   int ref = T_REF_INC(cache);
   UNUSED(ref);
 }
 void indexCacheUnRef(IndexCache* cache) {
-  if (cache == NULL) { return; }
-
+  if (cache == NULL) {
+    return;
+  }
   int ref = T_REF_DEC(cache);
-  if (ref == 0) { indexCacheDestroy(cache); }
+  if (ref == 0) {
+    indexCacheDestroy(cache);
+  }
 }
 
 void indexMemRef(MemTable* tbl) {
-  if (tbl == NULL) { return; }
+  if (tbl == NULL) {
+    return;
+  }
   int ref = T_REF_INC(tbl);
   UNUSED(ref);
 }
 void indexMemUnRef(MemTable* tbl) {
-  if (tbl == NULL) { return; }
-
+  if (tbl == NULL) {
+    return;
+  }
   int ref = T_REF_DEC(tbl);
   if (ref == 0) {
     SSkipList* slt = tbl->mem;
@@ -286,8 +305,9 @@ void indexMemUnRef(MemTable* tbl) {
 }
 
 static void cacheTermDestroy(CacheTerm* ct) {
-  if (ct == NULL) { return; }
-
+  if (ct == NULL) {
+    return;
+  }
   free(ct->colVal);
   free(ct);
 }
@@ -301,21 +321,11 @@ static int32_t compareKey(const void* l, const void* r) {
   CacheTerm* rt = (CacheTerm*)r;
 
   // compare colVal
-  int i, j;
-  for (i = 0, j = 0; i < lt->nColVal && j < rt->nColVal; i++, j++) {
-    if (lt->colVal[i] == rt->colVal[j]) {
-      continue;
-    } else {
-      return lt->colVal[i] < rt->colVal[j] ? -1 : 1;
-    }
+  int32_t cmp = strcmp(lt->colVal, rt->colVal);
+  if (cmp == 0) {
+    return rt->version - lt->version;
   }
-  if (i < lt->nColVal) {
-    return 1;
-  } else if (j < rt->nColVal) {
-    return -1;
-  }
-  // compare version
-  return rt->version - lt->version;
+  return cmp;
 }
 
 static MemTable* indexInternalCacheCreate(int8_t type) {
@@ -334,8 +344,9 @@ static void doMergeWork(SSchedMsg* msg) {
 }
 static bool indexCacheIteratorNext(Iterate* itera) {
   SSkipListIterator* iter = itera->iter;
-  if (iter == NULL) { return false; }
-
+  if (iter == NULL) {
+    return false;
+  }
   IterateValue* iv = &itera->val;
   iterateValueDestroy(iv, false);
 
@@ -349,10 +360,7 @@ static bool indexCacheIteratorNext(Iterate* itera) {
 
     taosArrayPush(iv->val, &ct->uid);
   }
-
   return next;
 }
 
-static IterateValue* indexCacheIteratorGetValue(Iterate* iter) {
-  return &iter->val;
-}
+static IterateValue* indexCacheIteratorGetValue(Iterate* iter) { return &iter->val; }