Github user weijietong commented on the issue: https://github.com/apache/drill/pull/904 @vvysotskyi thanks for your patient review . As you pointed out , the timezone would not take effect when test cases run in parallel. I also tried the mock strategy. It will also fail in parallel. So I moved out that part of code to a new class called `TestCastFunctionsSpecTZCases` by specifying the timezone before the cluster starts up. It would be clear to the codes.
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