[TD-5229]<fix>: cname display is incomplete

add method in util/sql.py---getColNameList() and checkColNameList

add testcase query/queryCnameDisplay.py

tests/pytest/fulltest.sh

@@ -240,6 +240,7 @@ python3 ./test.py -f query/nestedQuery/queryInterval.py
 python3 ./test.py -f query/queryStateWindow.py
 python3 ./test.py -f query/nestedQuery/queryWithOrderLimit.py
 python3 ./test.py -f query/nestquery_last_row.py
+python3 ./test.py -f query/queryCnameDisplay.py
 
 
 #stream