diff --git a/tests/pytest/query/filterOtherTypes.py b/tests/pytest/query/filterOtherTypes.py
index 5033ffdb48237e6a758d67162af5757cce04252d..85d5a67bef04564741ae7c17bd12ee992fcc09f8 100644
--- a/tests/pytest/query/filterOtherTypes.py
+++ b/tests/pytest/query/filterOtherTypes.py
@@ -365,6 +365,54 @@ class TDTestCase:
         # _ for binary type on tag case 5
         tdSql.query("select * from st where tagcol3 like '_据'")
         tdSql.checkRows(0)
+        
+        # test case for https://jira.taosdata.com:18080/browse/TD-857
+        tdSql.execute("create database test")
+        tdSql.execute("use test")
+        tdSql.execute("create table meters(ts timestamp, voltage int) tags(tag1 binary(20))")
+        tdSql.execute("create table t1 using meters tags('beijing')")
+        tdSql.execute("create table t2 using meters tags('nanjing')")        
+
+        tdSql.execute("insert into t1 values(1538548685000, 1) (1538548685001, 2) (1538548685002, 3)")
+        tdSql.execute("insert into t2 values(1538548685000, 4) (1538548685001, 5) (1538548685002, 6)")
+
+        tdSql.query("select * from t1 where tag1 like '%g'")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from t2 where tag1 like '%g'")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from meters where tag1 like '%g'")
+        tdSql.checkRows(6)
+
+        tdSql.execute("create table meters1(ts timestamp, voltage int) tags(tag1 nchar(20))")
+        tdSql.execute("create table t3 using meters1 tags('北京')")
+        tdSql.execute("create table t4 using meters1 tags('南京')")
+        tdSql.execute("create table t5 using meters1 tags('beijing')")
+        tdSql.execute("create table t6 using meters1 tags('nanjing')")        
+
+        tdSql.execute("insert into t3 values(1538548685000, 1) (1538548685001, 2) (1538548685002, 3)")
+        tdSql.execute("insert into t4 values(1538548685000, 4) (1538548685001, 5) (1538548685002, 6)")
+        tdSql.execute("insert into t5 values(1538548685000, 1) (1538548685001, 2) (1538548685002, 3)")
+        tdSql.execute("insert into t6 values(1538548685000, 1) (1538548685001, 2) (1538548685002, 3)")
+
+        tdSql.query("select * from t3 where tag1 like '%京'")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from t4 where tag1 like '%京'")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from meters1 where tag1 like '%京'")
+        tdSql.checkRows(6)
+        
+        tdSql.query("select * from t5 where tag1 like '%g'")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from t6 where tag1 like '%g'")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from meters1 where tag1 like '%g'")
+        tdSql.checkRows(6)
 
     def stop(self):
         tdSql.close()
diff --git a/tests/pytest/query/queryJoin.py b/tests/pytest/query/queryJoin.py
index 6ea240a334b4f4baf267aaacf53cfa0940c6c388..17027cf498ff9e87b558866cd4d1e6a8c865afc0 100644
--- a/tests/pytest/query/queryJoin.py
+++ b/tests/pytest/query/queryJoin.py
@@ -114,6 +114,32 @@ class TDTestCase:
 
         tdSql.error("select stb_t.ts, stb_t.dscrption, stb_t.temperature, stb_t.pid, stb_p.id, stb_p.dscrption, stb_p.pressure,stb_v.velocity from stb_p, stb_t, stb_v where stb_p.ts=stb_t.ts and stb_p.ts=stb_v.ts and stb_p.id = stb_t.id")
 
+        # test case for https://jira.taosdata.com:18080/browse/TD-1250
+        
+        tdSql.execute("create table meters1(ts timestamp, voltage int) tags(tag1 binary(20), tag2 nchar(20))")
+        tdSql.execute("create table t1 using meters1 tags('beijing', 'chaoyang')")
+        tdSql.execute("create table t2 using meters1 tags('shanghai', 'xuhui')") 
+        tdSql.execute("insert into t1 values(1538548685000, 1) (1538548685001, 2) (1538548685002, 3)")
+        tdSql.execute("insert into t1 values(1538548685004, 4) (1538548685004, 5) (1538548685005, 6)")
+
+        tdSql.execute("create table meters2(ts timestamp, voltage int) tags(tag1 binary(20), tag2 nchar(20))")
+        tdSql.execute("create table t3 using meters2 tags('beijing', 'chaoyang')")
+        tdSql.execute("create table t4 using meters2 tags('shenzhen', 'nanshan')")        
+        tdSql.execute("insert into t3 values(1538548685000, 7) (1538548685001, 8) (1538548685002, 9)")
+        tdSql.execute("insert into t4 values(1538548685000, 10) (1538548685001, 11) (1538548685002, 12)")
+
+        tdSql.execute("create table meters3(ts timestamp, voltage int) tags(tag1 binary(20), tag2 nchar(20))")
+        
+        tdSql.query("select * from meters1, meters2 where meters1.ts = meters2.ts and meters1.tag1 = meters2.tag1")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from meters1, meters2 where meters1.ts = meters2.ts and meters1.tag2 = meters2.tag2")
+        tdSql.checkRows(3)
+
+        tdSql.query("select * from meters1, meters3 where meters1.ts = meters3.ts and meters1.tag1 = meters3.tag1")
+        tdSql.checkRows(0)
+
+
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)
diff --git a/tests/pytest/tag_lite/float.py b/tests/pytest/tag_lite/float.py
index 9c4d20e82bc92e193d18de74c18ba286d1af3a95..7b93cb0ac91d49299aedfa63e5dcc8571415cdce 100644
--- a/tests/pytest/tag_lite/float.py
+++ b/tests/pytest/tag_lite/float.py
@@ -575,23 +575,6 @@ class TDTestCase:
         # TSIM: system sh/exec.sh -n dnode1 -s stop -x SIGINT
 # convert end
 
-        tdSql.execute("create database db")
-        tdSql.execute("use db")
-        tdSql.execute(
-            "create table if not exists st (ts timestamp, tagtype int) tags(dev float)")
-        tdSql.error(
-            'CREATE TABLE if not exists dev_001 using st tags(%f)' % -3.4E38 - 1)
-        tdSql.error(
-            'CREATE TABLE if not exists dev_001 using st tags(%f)' % 3.4E38 + 1)
-        
-        tdSql.execute(
-            'CREATE TABLE if not exists dev_001 using st tags(%f)' % 3.4E38)
-        tdSql.execute(
-            'CREATE TABLE if not exists dev_002 using st tags(%f)' % -3.4E38)
-          
-        tdSql.query("show tables")
-        tdSql.checkRows(2)  
-
     def stop(self):
         tdSql.close()
         tdLog.success("%s successfully executed" % __file__)