diff --git a/tests/system-test/fulltest.sh b/tests/system-test/fulltest.sh
index 585acb733a..ee790b338f 100755
--- a/tests/system-test/fulltest.sh
+++ b/tests/system-test/fulltest.sh
@@ -22,8 +22,9 @@ python3 ./test.py -f 2-query/upper.py
 python3 ./test.py -f 2-query/lower.py
 python3 ./test.py -f 2-query/join.py
 python3 ./test.py -f 2-query/cast.py
-# python3 ./test.py -f 2-query/concat.py  # after wal ,crash occured
-# python3 ./test.py -f 2-query/concat_ws.py
+python3 ./test.py -f 2-query/concat.py  # after wal ,crash occured
+python3 ./test.py -f 2-query/concat_ws.py
+python3 ./test.py -f 2-query/union.py
 
 python3 ./test.py -f 2-query/timezone.py
 python3 ./test.py -f 2-query/Now.py