Github user wgtmac commented on the issue: https://github.com/apache/orc/pull/233 Yes I agree with what you've said. The only problem of using UTC in the C++ ColumnVectorBatch is that there is an issue for C++ writer to convert timestamp in the DST back to local timezone. This will cause data correctness issue. BTW, since you've mentioned ORC 2.0, what's the plan for decimal encoding? And what's the timeline for its development and release? Thanks! @omalley
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