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https://issues.apache.org/jira/browse/HIVE-4884?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-4884:
--------------------------
Release Note: Adjust milliseconds down when encountering a negative second
value with a fractional second stored as nanoseconds.
Status: Patch Available (was: In Progress)
> ORC TimestampTreeReader.nextVector() off by a second when time in fractional
> ----------------------------------------------------------------------------
>
> Key: HIVE-4884
> URL: https://issues.apache.org/jira/browse/HIVE-4884
> Project: Hive
> Issue Type: Sub-task
> Components: File Formats
> Affects Versions: vectorization-branch
> Reporter: Gopal V
> Assignee: Gopal V
> Fix For: vectorization-branch
>
> Attachments: HIVE-4884-0000.patch
>
>
> When using negative timestamps, the ORC vectorized Timestampreader does the
> following
> {code}
> result.vector[i] = (result.vector[i] * 1000000) + nanoVector.vector[i];
> {code}
> This suffers from inaccuracies because the nanoseconds are always positive
> and the result.vector[i] is in effect
> {code}
> seconds = (getTime() / 1000)
> nanos = (getNanos())
> // so -42001 ms is written as
> // seconds = -42
> // nanos = 999000000
> // (-42001 / 1000) * 1000 == -42000
> // + 999 ms (from nanos)
> // which is -42999 ms
> {code}
> This needs to be adjusted down if nanos has been zero adjusted, to result in
> -42001 as the vector[i] value.
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