diff --git a/include/util/tlosertree.h b/include/util/tlosertree.h
index 241647ba1eff40c2860368923008432768f92485..51906443f5ab874a2e7b16a11304ed6890f90437 100644
--- a/include/util/tlosertree.h
+++ b/include/util/tlosertree.h
@@ -13,14 +13,16 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _TD_UTIL_LOSERTREE_H
-#define _TD_UTIL_LOSERTREE_H
+#ifndef _TD_UTIL_LOSERTREE_H_
+#define _TD_UTIL_LOSERTREE_H_
+
+#include "os.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-typedef int (*__merge_compare_fn_t)(const void *, const void *, void *param);
+typedef int32_t (*__merge_compare_fn_t)(const void *, const void *, void *param);
 
 typedef struct STreeNode {
   int32_t index;
@@ -31,16 +33,17 @@ typedef struct SMultiwayMergeTreeInfo {
   int32_t              numOfSources;
   int32_t              totalSources;
   __merge_compare_fn_t comparFn;
-  void *               param;
+  void                *param;
   struct STreeNode    *pNode;
 } SMultiwayMergeTreeInfo;
 
 #define tMergeTreeGetChosenIndex(t_) ((t_)->pNode[0].index)
 #define tMergeTreeGetAdjustIndex(t_) (tMergeTreeGetChosenIndex(t_) + (t_)->numOfSources)
 
-int32_t tMergeTreeCreate(SMultiwayMergeTreeInfo **pTree, uint32_t numOfEntries, void *param, __merge_compare_fn_t compareFn);
+int32_t tMergeTreeCreate(SMultiwayMergeTreeInfo **pTree, uint32_t numOfEntries, void *param,
+                         __merge_compare_fn_t compareFn);
 
-void tMergeTreeDestroy(SMultiwayMergeTreeInfo* pTree);
+void tMergeTreeDestroy(SMultiwayMergeTreeInfo *pTree);
 
 void tMergeTreeAdjust(SMultiwayMergeTreeInfo *pTree, int32_t idx);
 
@@ -52,4 +55,4 @@ void tMergeTreePrint(const SMultiwayMergeTreeInfo *pTree);
 }
 #endif
 
-#endif  /*_TD_UTIL_LOSERTREE_H*/
+#endif /*_TD_UTIL_LOSERTREE_H_*/
diff --git a/include/util/tmacro.h b/include/util/tmacro.h
index 297c37d62a99763462a7a61222ababf706a62b43..07c6e6509e4d5eedd7c14a830922b8347111f6e8 100644
--- a/include/util/tmacro.h
+++ b/include/util/tmacro.h
@@ -24,7 +24,7 @@ extern "C" {
 
 // Module init/clear MACRO definitions
 #define TD_MOD_UNINITIALIZED 0
-#define TD_MOD_INITIALIZED 1
+#define TD_MOD_INITIALIZED   1
 
 typedef int8_t td_mode_flag_t;
 
diff --git a/source/util/src/tlosertree.c b/source/util/src/tlosertree.c
index 8b7f55809baa1eabbd10be49d22b4f44d2db8c90..6349ab170c3df30abd94f8b978f16aa598bc22da 100644
--- a/source/util/src/tlosertree.c
+++ b/source/util/src/tlosertree.c
@@ -13,12 +13,10 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "os.h"
-#include "tlog.h"
+#define _DEFAULT_SOURCE
 #include "tlosertree.h"
 #include "taoserror.h"
-
-
+#include "tlog.h"
 
 // Set the initial value of the multiway merge tree.
 static void tMergeTreeInit(SMultiwayMergeTreeInfo* pTree) {
@@ -33,10 +31,12 @@ static void tMergeTreeInit(SMultiwayMergeTreeInfo* pTree) {
   }
 }
 
-int32_t tMergeTreeCreate(SMultiwayMergeTreeInfo** pTree, uint32_t numOfSources, void* param, __merge_compare_fn_t compareFn) {
+int32_t tMergeTreeCreate(SMultiwayMergeTreeInfo** pTree, uint32_t numOfSources, void* param,
+                         __merge_compare_fn_t compareFn) {
   int32_t totalEntries = numOfSources << 1u;
 
-  SMultiwayMergeTreeInfo* pTreeInfo = (SMultiwayMergeTreeInfo*)calloc(1, sizeof(SMultiwayMergeTreeInfo) + sizeof(STreeNode) * totalEntries);
+  SMultiwayMergeTreeInfo* pTreeInfo =
+      (SMultiwayMergeTreeInfo*)calloc(1, sizeof(SMultiwayMergeTreeInfo) + sizeof(STreeNode) * totalEntries);
   if (pTreeInfo == NULL) {
     uError("allocate memory for loser-tree failed. reason:%s", strerror(errno));
     return TAOS_SYSTEM_ERROR(errno);
@@ -88,7 +88,7 @@ void tMergeTreeAdjust(SMultiwayMergeTreeInfo* pTree, int32_t idx) {
     return;
   }
 
-  int32_t        parentId = idx >> 1;
+  int32_t   parentId = idx >> 1;
   STreeNode kLeaf = pTree->pNode[idx];
 
   while (parentId > 0) {