diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 9dc541b1a6efce68c4f27fc4cbaed7e8c5b542a8..b9a9333fd7459757b6a55a60cd3b824a948531a8 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -3190,6 +3190,7 @@ static void freeQueryInfoImpl(SQueryInfo* pQueryInfo) {
   }
   
   pQueryInfo->tsBuf = tsBufDestroy(pQueryInfo->tsBuf);
+  pQueryInfo->fillType = 0;
 
   tfree(pQueryInfo->fillVal);
   tfree(pQueryInfo->buf);
diff --git a/src/os/src/detail/osTimer.c b/src/os/src/detail/osTimer.c
index c381b3e825f508b17ec0d6a053a574957c5dc365..618df8a8bad451984fafd022a33a799986a48422 100644
--- a/src/os/src/detail/osTimer.c
+++ b/src/os/src/detail/osTimer.c
@@ -38,7 +38,7 @@ static void *taosProcessAlarmSignal(void *tharg) {
 
   struct sigevent sevent = {{0}};
 
-  setThreadName("alarmSignal");
+  setThreadName("tmr");
 
   #ifdef _ALPINE
     sevent.sigev_notify = SIGEV_THREAD;
diff --git a/tests/script/general/parser/join.sim b/tests/script/general/parser/join.sim
index 2c14a86c3a6532088d0dce584199c0d5ffbed6fd..e2132589bd3a54d42e683094f184b3a4a4932f71 100644
--- a/tests/script/general/parser/join.sim
+++ b/tests/script/general/parser/join.sim
@@ -444,6 +444,10 @@ if $rows != $val then
   return -1
 endi
 
+print ================>TD-5600
+sql select first(join_tb0.c8),first(join_tb0.c9) from join_tb1 , join_tb0 where join_tb1.ts = join_tb0.ts and join_tb1.ts <= 100002 and join_tb1.ts>=100000 interval(1s) fill(linear);
+
+
 #===============================================================
 sql select first(join_tb0.c8),first(join_tb0.c9) from join_tb1 , join_tb0 where join_tb1.ts = join_tb0.ts and join_tb1.ts <= 100002 and join_tb0.c7 = true