Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16308#discussion_r97556081
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/DateFunctionsSuite.scala ---
    @@ -475,6 +1164,45 @@ class DateFunctionsSuite extends QueryTest with 
SharedSQLContext {
           Row(ts1.getTime / 1000L), Row(ts2.getTime / 1000L)))
       }
     
    +  test("to_unix_timestamp with session local timezone") {
    --- End diff --
    
    The problem is, except this suite, all the changes you made to the tests 
are just fixed existing tests to fit the timezone stuff. You add all the new 
tests in this suite as end-to-end tests, which is not good. We should add new 
tests in `DateTimeUtilsSuite` as unit tests.


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