diff --git a/src/util/inc/talgo.h b/src/util/inc/talgo.h
index e89795c08615573d92752c9d2c76ea24330d661d..d5e089b687807cf8e028ca721c64959afc92914d 100644
--- a/src/util/inc/talgo.h
+++ b/src/util/inc/talgo.h
@@ -20,9 +20,37 @@
 extern "C" {
 #endif
 
+#define TD_EQ 0x1
+#define TD_GT 0x2
+#define TD_LT 0x4
+#define TD_GE (TD_EQ | TD_GT)
+#define TD_LE (TD_EQ | TD_LT)
+
 typedef int32_t (*__ext_compar_fn_t)(const void *p1, const void *p2, const void *param);
 
-void tqsort(void *src, size_t numOfElem, size_t size, const void* param, __ext_compar_fn_t comparFn);
+/**
+ * quick sort, with the compare function requiring additional parameters support
+ *
+ * @param src
+ * @param numOfElem
+ * @param size
+ * @param param
+ * @param comparFn
+ */
+void taosqsort(void *src, size_t numOfElem, size_t size, const void* param, __ext_compar_fn_t comparFn);
+
+/**
+ * binary search, with range support
+ *
+ * @param key
+ * @param base
+ * @param nmemb
+ * @param size
+ * @param fn
+ * @param flags
+ * @return
+ */
+void *taosbsearch(const void *key, const void *base, size_t nmemb, size_t size, __compar_fn_t fn, int flags);
 
 #ifdef __cplusplus
 }
diff --git a/src/util/inc/tutil.h b/src/util/inc/tutil.h
index c4c802a68881107da8a09044ea4eb4aa206c9340..81cf177e73696723d147aefb4352df721240a1cf 100644
--- a/src/util/inc/tutil.h
+++ b/src/util/inc/tutil.h
@@ -170,14 +170,6 @@ uint32_t ip2uint(const char *const ip_addr);
 void taosSetAllocMode(int mode, const char* path, bool autoDump);
 void taosDumpMemoryLeak();
 
-#define TD_EQ 0x1
-#define TD_GT 0x2
-#define TD_LT 0x4
-#define TD_GE (TD_EQ | TD_GT)
-#define TD_LE (TD_EQ | TD_LT)
-void *taosbsearch(const void *key, const void *base, size_t nmemb, size_t size,
-                  int (*compar)(const void *, const void *), int flags);
-
 #ifdef TAOS_MEM_CHECK
 
 void *  taos_malloc(size_t size, const char *file, uint32_t line);
diff --git a/src/util/src/talgo.c b/src/util/src/talgo.c
index 1004d5ab6777694345f1dfb445b80944ae37e6f7..7a682cd466adaadd39cf38190725ff8ace7ba2ce 100644
--- a/src/util/src/talgo.c
+++ b/src/util/src/talgo.c
@@ -1,3 +1,17 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
 
 #include "os.h"
 #include "tutil.h"
@@ -47,7 +61,7 @@ static void tInsertSort(void *src, size_t size, int32_t s, int32_t e, const void
   }
 }
 
-void tqsortImpl(void *src, int32_t start, int32_t end, size_t size, const void *param, __ext_compar_fn_t comparFn,
+static void tqsortImpl(void *src, int32_t start, int32_t end, size_t size, const void *param, __ext_compar_fn_t comparFn,
                 void* buf) {
   // short array sort, incur another sort procedure instead of quick sort process
   const int32_t THRESHOLD_SIZE = 6;
@@ -138,13 +152,13 @@ void tqsortImpl(void *src, int32_t start, int32_t end, size_t size, const void *
   }
 }
 
-void tqsort(void *src, size_t numOfElem, size_t size, const void* param, __ext_compar_fn_t comparFn) {
+void taosqsort(void *src, size_t numOfElem, size_t size, const void* param, __ext_compar_fn_t comparFn) {
   char *buf = calloc(1, size);   // prepare the swap buffer
   tqsortImpl(src, 0, numOfElem - 1, size, param, comparFn, buf);
   tfree(buf);
 }
 
-void * taosbsearch(const void *key, const void *base, size_t nmemb, size_t size, int (*compar)(const void *, const void *), int flags) {
+void * taosbsearch(const void *key, const void *base, size_t nmemb, size_t size, __compar_fn_t compar, int flags) {
   // TODO: need to check the correctness of this function
   int l = 0;
   int r = nmemb;
diff --git a/src/vnode/tsdb/src/tsdbFile.c b/src/vnode/tsdb/src/tsdbFile.c
index d025144ba93ce239529a1c872065945d62c6ea7a..7576717dd1a9eeef30d3ef9aa7eaee6373d74fff 100644
--- a/src/vnode/tsdb/src/tsdbFile.c
+++ b/src/vnode/tsdb/src/tsdbFile.c
@@ -22,8 +22,9 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#include "tutil.h"
 #include "tsdbMain.h"
+#include "tutil.h"
+#include "talgo.h"
 
 const char *tsdbFileSuffix[] = {
     ".head",  // TSDB_FILE_TYPE_HEAD
diff --git a/src/vnode/tsdb/src/tsdbMain.c b/src/vnode/tsdb/src/tsdbMain.c
index 2b26eec53a3cbadc3d8b27c7bf58774380e3ac73..f558982419548efcdc23bcc418370b0aa04c69b0 100644
--- a/src/vnode/tsdb/src/tsdbMain.c
+++ b/src/vnode/tsdb/src/tsdbMain.c
@@ -15,6 +15,7 @@
 // #include "taosdef.h"
 // #include "disk.h"
 #include "os.h"
+#include "talgo.h"
 #include "tsdb.h"
 #include "tsdbMain.h"
 
diff --git a/src/vnode/tsdb/src/tsdbRead.c b/src/vnode/tsdb/src/tsdbRead.c
index 8d48b1ec486bbfa01a7265141b429de1edb67cb7..495cf8c7f5717d2bbbbd011ded38ccf6879295be 100644
--- a/src/vnode/tsdb/src/tsdbRead.c
+++ b/src/vnode/tsdb/src/tsdbRead.c
@@ -1347,7 +1347,7 @@ SArray* createTableGroup(SArray* pTableList, STSchema* pTagSchema, SColIndex* pC
     pSupp->pTagSchema = pTagSchema;
     pSupp->pCols = pCols;
     
-    tqsort(pTableList->pData, size, POINTER_BYTES, pSupp, tableGroupComparFn);
+    taosqsort(pTableList->pData, size, POINTER_BYTES, pSupp, tableGroupComparFn);
     createTableGroupImpl(pTableGroup, pTableList->pData, size, pSupp, tableGroupComparFn);
 
 #ifdef _DEBUG_VIEW