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From omalley <...@git.apache.org>
Subject [GitHub] orc issue #233: ORC-322: [C++] Fix writing & reading timestamp
Date Fri, 23 Mar 2018 17:42:02 GMT
Github user omalley commented on the issue:

    So the semantics of the current timestamp type are that it does not change with the reader's
timezone. It should always come back the same. If you put '2018-03-23 12:34:56.789' in, it
should always come back exactly the same.
    The easiest way to get that effect is to use UTC in the ColumnVectorBatch, so that is
what we do. This is different from the Java side because there we needed to use Java's Timestamp
class,  which always uses local.
    We are going to add a new type that is "timestamp with local timezone" in ORC-189. That
is for the instance in time where timezone is taken in to account.
    The encoding of timestamps in ORC 1.x is overly complicated because I messed it up and
we've tried to maintain backwards and forwards compatibility. In ORC 2 we'll just use UTC
for encoding both types.


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