fix case

tests/system-test/fulltest.sh

@@ -44,6 +44,7 @@ python3 ./test.py -f 2-query/check_tsdb.py
 python3 ./test.py -f 2-query/spread.py
 python3 ./test.py -f 2-query/hyperloglog.py
 python3 ./test.py -f 2-query/explain.py
+python3 ./test.py -f 2-query/leastsquares.py
 
 
 python3 ./test.py -f 2-query/timezone.py
@@ -80,7 +81,7 @@ python3 ./test.py -f 2-query/arccos.py
 python3 ./test.py -f 2-query/arctan.py
 python3 ./test.py -f 2-query/query_cols_tags_and_or.py
 # python3 ./test.py -f 2-query/nestedQuery.py
-# TD-15983 subquery output duplicate name column. 
+# TD-15983 subquery output duplicate name column.
 # Please Xiangyang Guo modify the following script
 # python3 ./test.py -f 2-query/nestedQuery_str.py