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https://issues.apache.org/jira/browse/ORC-320?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang resolved ORC-320.
--------------------------------
Resolution: Fixed
Fixed in ORC-322
> C++ writer tests failed when Daylight Saving Time started
> ---------------------------------------------------------
>
> Key: ORC-320
> URL: https://issues.apache.org/jira/browse/ORC-320
> Project: ORC
> Issue Type: Bug
> Components: C++
> Reporter: Quanlong Huang
> Assignee: Quanlong Huang
> Priority: Major
>
> C++ writer tests failed in writeTimestamp when Daylight Saving Time started.
> Errors are
> {code:java}
> /mnt/volume1/orc/c++/test/TestWriter.cc:596: Failure
> Expected: times[i]
> Which is: 1520762379
> To be equal to: tsBatch->data[i]
> Which is: 1520765979
> /mnt/volume1/orc/c++/test/TestWriter.cc:596: Failure
> Expected: times[i]
> Which is: 1520762319
> To be equal to: tsBatch->data[i]
> Which is: 1520765919
> /mnt/volume1/orc/c++/test/TestWriter.cc:596: Failure
> Expected: times[i]
> Which is: 1520762259
> To be equal to: tsBatch->data[i]
> Which is: 1520765859
> /mnt/volume1/orc/c++/test/TestWriter.cc:596: Failure
> Expected: times[i]
> Which is: 1520762199
> To be equal to: tsBatch->data[i]
> Which is: 1520765799
> ...
> {code}
> The expected values are 3600 less than the corresponding values.
> This can only be reproduced in American timezones which use Daylight Saving
> Time. In Asia like China, the test can succeed.
> As time passes by, the test comes back to succeed. It seems that there's
> something wrong in dealing with timestamps around the Daylight Saving Time
> switch point. You can increase the rowCount to 102400 to reproduce this
> failure in American timezones.
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