diff --git a/src/os/darwin/src/tdarwin.c b/src/os/darwin/src/tdarwin.c
index eec252d6608b07ea8c740ab8e318413b37b4b4d4..71e8a56466fbbfad778d0cdc49d38c5c9bf8c009 100644
--- a/src/os/darwin/src/tdarwin.c
+++ b/src/os/darwin/src/tdarwin.c
@@ -243,10 +243,6 @@ int taosInitTimer(void (*callback)(int), int ms) {
   return setitimer(ITIMER_REAL, &tv, NULL);
 }
 
-char *taosCharsetReplace(char *charsetstr) {
-  return charsetstr;
-}
-
 void taosGetSystemTimezone() {
   // get and set default timezone
   SGlobalConfig *cfg_timezone = tsGetConfigOption("timezone");
@@ -416,3 +412,11 @@ int tsem_post(dispatch_semaphore_t *sem) {
 int tsem_destroy(dispatch_semaphore_t *sem) {
   return 0;
 }
+
+int32_t __sync_val_load_32(int32_t *ptr) {
+  return __atomic_load_n(ptr, __ATOMIC_ACQUIRE);
+}
+
+void __sync_val_restore_32(int32_t *ptr, int32_t newval) {
+  __atomic_store_n(ptr, newval, __ATOMIC_RELEASE);
+}
\ No newline at end of file
diff --git a/src/os/linux/src/tsystem.c b/src/os/linux/src/tsystem.c
index fc2d9860d78f23bec4010774179e1ea64598f586..ccf9266f9bcddbe747211f8b3ad4ecf2b580c325 100644
--- a/src/os/linux/src/tsystem.c
+++ b/src/os/linux/src/tsystem.c
@@ -210,25 +210,6 @@ void taosGetSystemTimezone() {
   pPrint("timezone not configured, set to system default:%s", tsTimezone);
 }
 
-typedef struct CharsetPair {
-  char *oldCharset;
-  char *newCharset;
-} CharsetPair;
-
-char *taosCharsetReplace(char *charsetstr) {
-  CharsetPair charsetRep[] = {
-      {"utf8", "UTF-8"}, {"936", "CP936"},
-  };
-
-  for (int32_t i = 0; i < tListLen(charsetRep); ++i) {
-    if (strcasecmp(charsetRep[i].oldCharset, charsetstr) == 0) {
-      return strdup(charsetRep[i].newCharset);
-    }
-  }
-
-  return strdup(charsetstr);
-}
-
 /*
  * POSIX format locale string:
  * (Language Strings)_(Country/Region Strings).(code_page)
diff --git a/src/os/windows/src/twindows.c b/src/os/windows/src/twindows.c
index 6c10ced6a2c2030c732f6d44606ba64f6ec83167..9089f90d6ad8b0ae2c3bfeee9f1043c29926f144 100644
--- a/src/os/windows/src/twindows.c
+++ b/src/os/windows/src/twindows.c
@@ -205,10 +205,6 @@ __int64 interlocked_fetch_xor_64(__int64 volatile* ptr, __int64 val) {
 
 void tsPrintOsInfo() {}
 
-char *taosCharsetReplace(char *charsetstr) {
-  return charsetstr;
-}
-
 void taosGetSystemTimezone() {
   // get and set default timezone
   SGlobalConfig *cfg_timezone = tsGetConfigOption("timezone");
diff --git a/src/system/detail/src/vnodeImport.c b/src/system/detail/src/vnodeImport.c
index cd81a9b0b805f4b00767f40073e69232ef8f3d0c..de795f820b18254c7c8362bbb80c24de7e4b91d4 100644
--- a/src/system/detail/src/vnodeImport.c
+++ b/src/system/detail/src/vnodeImport.c
@@ -546,6 +546,7 @@ int vnodeImportToCache(SImportInfo *pImport, char *payload, int rows) {
     return code;
   }
 
+  assert(rows);
   dTrace("vid:%d sid:%d id:%s, %d rows data will be imported to cache, firstKey:%ld lastKey:%ld",
       pObj->vnode, pObj->sid, pObj->meterId, rows, firstKey, lastKey);
 
@@ -781,7 +782,7 @@ int vnodeImportStartToCache(SImportInfo *pImport, char *payload, int rows) {
     pImport->importedRows = rows;
     code = vnodeImportToCache(pImport, payload, rows);
   } else {
-    dTrace("vid:%d sid:%d id:%s, data is already imported to cache", pObj->vnode, pObj->sid, pObj->meterId);
+    dTrace("vid:%d sid:%d id:%s, data is already imported to cache, firstKey:%lld", pObj->vnode, pObj->sid, pObj->meterId, pImport->firstKey);
   }
 
   return code;
diff --git a/src/util/src/tutil.c b/src/util/src/tutil.c
index 0d1ea9ed50cb1b4736ba5e713f014a562b59875b..af75a3ce0f9eef5d762bd5b11b4488123faea186 100644
--- a/src/util/src/tutil.c
+++ b/src/util/src/tutil.c
@@ -517,3 +517,22 @@ FORCE_INLINE double taos_align_get_double(char* pBuf) {
   *(int64_t*)(&dv) = *(int64_t*)pBuf;
   return dv; 
 }
+
+typedef struct CharsetPair {
+  char *oldCharset;
+  char *newCharset;
+} CharsetPair;
+
+char *taosCharsetReplace(char *charsetstr) {
+  CharsetPair charsetRep[] = {
+      { "utf8", "UTF-8" }, { "936", "CP936" },
+  };
+
+  for (int32_t i = 0; i < tListLen(charsetRep); ++i) {
+    if (strcasecmp(charsetRep[i].oldCharset, charsetstr) == 0) {
+      return strdup(charsetRep[i].newCharset);
+    }
+  }
+
+  return strdup(charsetstr);
+}