Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16308#discussion_r97330451
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DateFunctionsSuite.scala ---
@@ -69,11 +70,28 @@ class DateFunctionsSuite extends QueryTest with
SharedSQLContext {
checkAnswer(
df.select("t").filter($"t" <= "2014-06-01"),
Row(Timestamp.valueOf("2014-01-01 00:00:00")) :: Nil)
+ }
+ test("timestamp comparison with timestamp strings with session local
timezone") {
+ val df = Seq(
+ (1, Timestamp.valueOf("2015-12-31 16:00:00")),
+ (2, Timestamp.valueOf("2016-01-01 00:00:00"))).toDF("i", "t")
checkAnswer(
- df.select("t").filter($"t" >= "2014-06-01"),
- Row(Timestamp.valueOf("2015-01-01 00:00:00")) :: Nil)
+ df.select("t").filter($"t" <= "2016-01-01 00:00:00"),
+ Seq(
+ Row(Timestamp.valueOf("2015-12-31 16:00:00")),
+ Row(Timestamp.valueOf("2016-01-01 00:00:00"))))
+
+ withSQLConf(SQLConf.SESSION_LOCAL_TIMEZONE.key -> "GMT") {
+
+ // $"t" string in GMT would be as follows respectively:
+ // "2016-01-01 00:00:00"
+ // "2016-01-01 08:00:00"
+ checkAnswer(
+ df.select("t").filter($"t" <= "2016-01-01 00:00:00"),
+ Row(Timestamp.valueOf("2015-12-31 16:00:00")))
--- End diff --
this shows that it will be very confusing if the session local timezone is
different from JVM default timezone in driver...
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