few variables need reset after prepare called.

tests/pytest/query/filterCombo.py

@@ -42,14 +42,17 @@ class TDTestCase:
             ('2020-05-13 10:00:00.005', 3, 'third')""")
 
         # query with filter condition A OR condition B
-        tdSql.query("select * from db.st where ts > '2020-05-13 10:00:00.002' AND tagtype < 2")
+        tdSql.query(
+            "select * from db.st where ts > '2020-05-13 10:00:00.002' AND tagtype < 2")
         tdSql.checkRows(1)
 
         # query with filter condition A OR condition B, error expected
-        tdSql.error("select * from db.st where ts > '2020-05-13 10:00:00.002' OR tagtype < 2")
+        tdSql.error(
+            "select * from db.st where ts > '2020-05-13 10:00:00.002' OR tagtype < 2")
 
         # illegal condition
-        tdSql.error("select * from db.st where ts != '2020-05-13 10:00:00.002' OR tagtype < 2")        
+        tdSql.error(
+            "select * from db.st where ts != '2020-05-13 10:00:00.002' OR tagtype < 2")
         tdSql.error("select * from db.st where tagtype <> 1 OR tagtype < 2")
 
     def stop(self):

tests/pytest/query/queryError.py

@@ -41,7 +41,6 @@ class TDTestCase:
             ('2020-05-13 10:00:00.002', 3, 'third') dev_002 VALUES('2020-05-13 10:00:00.003', 1, 'first'), ('2020-05-13 10:00:00.004', 2, 'second'),
             ('2020-05-13 10:00:00.005', 3, 'third')""")
 
-        
         # query first .. as ..
         tdSql.error("select first(*) as one from st")
 

tests/pytest/query/queryNormal.py

@@ -28,9 +28,12 @@ class TDTestCase:
 
         print("==============step1")
 
-        tdSql.execute("create table stb1 (ts timestamp, c1 int, c2 float) tags(t1 int, t2 binary(10), t3 nchar(10))")
+        tdSql.execute(
-        tdSql.execute("insert into tb1 using stb1 tags(1,'tb1', '表1') values ('2020-04-18 15:00:00.000', 1, 0.1), ('2020-04-18 15:00:01.000', 2, 0.1)")
+            "create table stb1 (ts timestamp, c1 int, c2 float) tags(t1 int, t2 binary(10), t3 nchar(10))")
-        tdSql.execute("insert into tb2 using stb1 tags(2,'tb2', '表2') values ('2020-04-18 15:00:02.000', 3, 2.1), ('2020-04-18 15:00:03.000', 4, 2.2)")        
+        tdSql.execute(
+            "insert into tb1 using stb1 tags(1,'tb1', '表1') values ('2020-04-18 15:00:00.000', 1, 0.1), ('2020-04-18 15:00:01.000', 2, 0.1)")
+        tdSql.execute(
+            "insert into tb2 using stb1 tags(2,'tb2', '表2') values ('2020-04-18 15:00:02.000', 3, 2.1), ('2020-04-18 15:00:03.000', 4, 2.2)")
 
         # inner join --- bug
         tdSql.query("select * from tb1 a, tb2 b where a.ts = b.ts")

tests/pytest/random-test/random-test-multi-threading-3.py

@@ -111,7 +111,6 @@ class Test (threading.Thread):
                 last_tb)
             written = written + 1
 
-
     def drop_stable(self):
         tdLog.info("drop_stable")
         global last_stb
@@ -152,7 +151,6 @@ class Test (threading.Thread):
                 last_tb = ""
                 written = 0
 
-
     def query_data_from_stable(self):
         tdLog.info("query_data_from_stable")
         global last_stb
@@ -164,7 +162,6 @@ class Test (threading.Thread):
             tdLog.info("will query data from super table")
             tdSql.execute('select * from %s' % last_stb)
 
-
     def reset_query_cache(self):
         tdLog.info("reset_query_cache")
         global last_tb

tests/pytest/random-test/random-test-multi-threading.py

@@ -111,7 +111,6 @@ class Test (threading.Thread):
                 last_tb)
             written = written + 1
 
-
     def drop_stable(self):
         tdLog.info("drop_stable")
         global last_stb
@@ -154,7 +153,6 @@ class Test (threading.Thread):
                 last_tb = ""
                 written = 0
 
-
     def query_data_from_stable(self):
         tdLog.info("query_data_from_stable")
         global last_stb
@@ -166,7 +164,6 @@ class Test (threading.Thread):
             tdLog.info("will query data from super table")
             tdSql.execute('select * from %s' % last_stb)
 
-
     def reset_query_cache(self):
         tdLog.info("reset_query_cache")
         global last_tb

tests/pytest/random-test/random-test.py

@@ -112,7 +112,6 @@ class Test:
             tdSql.execute('drop table %s' % self.last_stb)
             self.last_stb = ""
 
-
     def query_data_from_stable(self):
         tdLog.info("query_data_from_stable")
         if (self.last_stb == ""):
@@ -122,20 +121,21 @@ class Test:
             tdLog.info("will query data from super table")
             tdSql.execute('select * from %s' % self.last_stb)
 
-
     def restart_database(self):
         tdLog.info("restart_databae")
         tdDnodes.stop(1)
         tdDnodes.start(1)
         tdLog.sleep(5)
 
-
     def force_restart_database(self):
         tdLog.info("force_restart_database")
         tdDnodes.forcestop(1)
         tdDnodes.start(1)
         tdLog.sleep(5)
         tdSql.prepare()
+        self.last_tb = ""
+        self.last_stb = ""
+        self.written = 0
 
     def drop_table(self):
         tdLog.info("drop_table")
@@ -159,6 +159,9 @@ class Test:
         tdDnodes.start(1)
         tdLog.sleep(5)
         tdSql.prepare()
+        self.last_tb = ""
+        self.last_stb = ""
+        self.written = 0
 
     def delete_datafiles(self):
         tdLog.info("delete_datafiles")
@@ -173,6 +176,9 @@ class Test:
         tdDnodes.start(1)
         tdLog.sleep(10)
         tdSql.prepare()
+        self.last_tb = ""
+        self.last_stb = ""
+        self.written = 0
 
 
 class TDTestCase: