akashrn5 commented on a change in pull request #3905:
URL: https://github.com/apache/carbondata/pull/3905#discussion_r484521356



##########
File path: 
integration/spark/src/test/scala/org/apache/carbondata/spark/testsuite/dataload/TestLoadDataWithDiffTimestampFormat.scala
##########
@@ -318,48 +318,53 @@ class TestLoadDataWithDiffTimestampFormat extends 
QueryTest with BeforeAndAfterA
   test("test load, update data with setlenient carbon property for daylight " +
        "saving time from different timezone") {
     
CarbonProperties.getInstance().addProperty(CarbonCommonConstants.CARBON_LOAD_DATEFORMAT_SETLENIENT_ENABLE,
 "true")
-    TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"))
     sql("DROP TABLE IF EXISTS test_time")
     sql("CREATE TABLE IF NOT EXISTS test_time (ID Int, date Date, time 
Timestamp) STORED AS carbondata " +
         "TBLPROPERTIES('dateformat'='yyyy-MM-dd', 
'timestampformat'='yyyy-MM-dd HH:mm:ss') ")
     sql(s" LOAD DATA LOCAL INPATH '$resourcesPath/differentZoneTimeStamp.csv' 
into table test_time")
-    sql(s"insert into test_time select 11, '2016-7-24', '1941-3-15 00:00:00' ")
-    sql("update test_time set (time) = ('1941-3-15 00:00:00') where ID='2'")
-    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 1"), 
Seq(Row(Timestamp.valueOf("1941-3-15 01:00:00"))))
-    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 11"), 
Seq(Row(Timestamp.valueOf("1941-3-15 01:00:00"))))
-    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 2"), 
Seq(Row(Timestamp.valueOf("1941-3-15 01:00:00"))))
+    sql(s"insert into test_time select 11, '2016-7-24', '2019-3-10 02:00:00' ")
+    sql("update test_time set (time) = ('2019-3-10 02:00:00') where ID='2'")
+    // Using America/Los_Angeles timezone (timezone is fixed to 
America/Los_Angeles for all tests)
+    // Here, 2019-3-10 02:00:00 is invalid data in America/Los_Angeles zone, 
as DST is observed and
+    // clocks were turned forward 1 hour to 2019-3-10 03:00:00. With lenience 
property enabled, can parse the time according to DST.
+    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 1"), 
Seq(Row(Timestamp.valueOf("2019-3-10 03:00:00"))))
+    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 11"), 
Seq(Row(Timestamp.valueOf("2019-3-10 03:00:00"))))
+    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 2"), 
Seq(Row(Timestamp.valueOf("2019-3-10 03:00:00"))))
     sql("DROP TABLE test_time")
     
CarbonProperties.getInstance().removeProperty(CarbonCommonConstants.CARBON_LOAD_DATEFORMAT_SETLENIENT_ENABLE)
   }
 
   test("test load, update data with setlenient session level property for 
daylight " +
        "saving time from different timezone") {
     sql("set carbon.load.dateformat.setlenient.enable = true")
-    TimeZone.setDefault(TimeZone.getTimeZone("Asia/Shanghai"))
     sql("DROP TABLE IF EXISTS test_time")
     sql("CREATE TABLE IF NOT EXISTS test_time (ID Int, date Date, time 
Timestamp) STORED AS carbondata " +
         "TBLPROPERTIES('dateformat'='yyyy-MM-dd', 
'timestampformat'='yyyy-MM-dd HH:mm:ss') ")
     sql(s" LOAD DATA LOCAL INPATH '$resourcesPath/differentZoneTimeStamp.csv' 
into table test_time")
-    sql(s"insert into test_time select 11, '2016-7-24', '1941-3-15 00:00:00' ")
-    sql("update test_time set (time) = ('1941-3-15 00:00:00') where ID='2'")
-    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 1"), 
Seq(Row(Timestamp.valueOf("1941-3-15 01:00:00"))))
-    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 11"), 
Seq(Row(Timestamp.valueOf("1941-3-15 01:00:00"))))
-    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 2"), 
Seq(Row(Timestamp.valueOf("1941-3-15 01:00:00"))))
+    sql(s"insert into test_time select 11, '2016-7-24', '2019-3-10 02:00:00' ")
+    sql("update test_time set (time) = ('2019-3-10 02:00:00') where ID='2'")
+    // Using America/Los_Angeles timezone (timezone is fixed to 
America/Los_Angeles for all tests)
+    // Here, 2019-3-10 02:00:00 is invalid data in America/Los_Angeles zone, 
as DST is observed and
+    // clocks were turned forward 1 hour to 2019-3-10 03:00:00. With lenience 
property enabled, can parse the time according to DST.
+    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 1"), 
Seq(Row(Timestamp.valueOf("2019-3-10 03:00:00"))))
+    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 11"), 
Seq(Row(Timestamp.valueOf("2019-3-10 03:00:00"))))
+    checkAnswer(sql("SELECT time FROM test_time WHERE ID = 2"), 
Seq(Row(Timestamp.valueOf("2019-3-10 03:00:00"))))
     sql("DROP TABLE test_time")
     defaultConfig()
   }
 
   def generateCSVFile(): Unit = {
     val rows = new ListBuffer[Array[String]]
     rows += Array("ID", "date", "time")
-    rows += Array("1", "1941-3-15", "1941-3-15 00:00:00")
+    rows += Array("1", "1941-3-15", "2019-3-10 02:00:00")
     rows += Array("2", "2016-7-24", "2016-7-24 01:02:30")
     BadRecordUtil.createCSV(rows, csvPath)
   }
 
   override def afterAll {
     sql("DROP TABLE IF EXISTS t3")
     FileUtils.forceDelete(new File(csvPath))
-    TimeZone.setDefault(defaultTimeZone)
+    
CarbonProperties.getInstance().removeProperty(CarbonCommonConstants.CARBON_LOAD_DATEFORMAT_SETLENIENT_ENABLE)
+    defaultConfig()

Review comment:
       why do we need to call this, defaultConfig(), here you have just set 
lenient to true, only reverting that would be enough right




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