fix: add test case

tests/parallel_test/cases.task

@@ -29,6 +29,7 @@
 ,,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/tbname_vgroup.py
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/compact-col.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/stbJoin.py
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/stbJoin.py -Q 2
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/stbJoin.py -Q 3

tests/system-test/2-query/compact-col.py

@@ -0,0 +1,71 @@
+import sys 
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import tdDnodes
+from math import inf
+
+class TDTestCase:
+    def caseDescription(self):
+        '''
+        case1<shenglian zhou>: [TD-] 
+        ''' 
+        return
+    
+    def init(self, conn, logSql, replicaVer=1):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), True)
+        self.conn = conn
+        
+    def restartTaosd(self, index=1, dbname="db"):
+        tdDnodes.stop(index)
+        tdDnodes.startWithoutSleep(index)
+        tdSql.execute(f"use tbname_vgroup")
+
+    def run(self):
+        print("running {}".format(__file__))
+        tdSql.execute("drop database if exists tbname_vgroup")
+        tdSql.execute("create database if not exists tbname_vgroup")
+        tdSql.execute('use tbname_vgroup')
+        tdSql.execute('drop database if exists dbvg')
+        tdSql.execute('create database dbvg vgroups 8;')
+
+        tdSql.execute('use dbvg;')
+
+        tdSql.execute('create table st(ts timestamp, f int) tags (t int);')
+
+        tdSql.execute("insert into ct1 using st tags(1) values('2021-04-19 00:00:01', 1)")
+
+        tdSql.execute("insert into ct2 using st tags(2) values('2021-04-19 00:00:02', 2)")
+
+        tdSql.execute("insert into ct3 using st tags(3) values('2021-04-19 00:00:03', 3)")
+
+        tdSql.execute("insert into ct4 using st tags(4) values('2021-04-19 00:00:04', 4)")
+
+
+        tdSql.execute('create table st2(ts timestamp, f int) tags (t int);')
+
+        tdSql.execute("insert into ct21 using st2 tags(1) values('2021-04-19 00:00:01', 1)")
+
+        tdSql.execute("insert into ct22 using st2 tags(2) values('2021-04-19 00:00:02', 2)")
+
+        tdSql.execute("insert into ct23 using st2 tags(3) values('2021-04-19 00:00:03', 3)")
+
+        tdSql.execute("insert into ct24 using st2 tags(4) values('2021-04-19 00:00:04', 4)")
+        
+        
+        col_names = tdSql.getColNameList("compact database tbname_vgroup")
+        if col_names[0] != "result":
+           raise Exception("first column name of compact result shall be result")
+
+        col_names = tdSql.getColNameList("show variables")
+        if col_names[0] != "name":
+           raise Exception("first column name of compact result shall be name")
+
+        tdSql.execute('drop database tbname_vgroup')
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())