fix: add test case

tests/parallel_test/cases.task

@@ -43,6 +43,7 @@ fi
 #,,n,system-test,python3 ./test.py -f 8-stream/snode_restart.py -N 4
 ,,n,system-test,python3 ./test.py -f 8-stream/snode_restart_with_checkpoint.py -N 4
 
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/partition_expr.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/project_group.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/tbname_vgroup.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/count_interval.py

tests/system-test/2-query/partition_expr.py

@@ -0,0 +1,35 @@
+from wsgiref.headers import tspecials
+from util.log import *
+from util.cases import *
+from util.sql import *
+import numpy as np
+
+
+class TDTestCase:
+    def init(self, conn, logSql, replicaVar=1):
+        self.replicaVar = int(replicaVar)
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor())
+
+        self.rowNum = 10
+        self.batchNum = 5
+        self.ts = 1537146000000
+
+    def run(self):
+        dbname = "db"
+        tdSql.prepare()
+
+        tdSql.execute(f'''create table sta(ts timestamp, f int, col2 bigint) tags(tg1 int, tg2 binary(20))''')
+        tdSql.execute(f"create table sta1 using sta tags(1, 'a')")
+        tdSql.execute(f"insert into sta1 values(1537146000001, 11, 110)")
+        tdSql.execute(f"insert into sta1 values(1537146000002, 12, 120)")
+        tdSql.execute(f"insert into sta1 values(1537146000003, 13, 130)")
+
+        tdSql.query("select _wstart, f+100, count(*) from db.sta partition by f+100 session(ts, 1a) order by _wstart");
+        tdSql.checkData(0, 1, 111.0)
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())