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https://issues.apache.org/jira/browse/ORC-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16939763#comment-16939763
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Owen O'Malley commented on ORC-554:
-----------------------------------
There are lots of the conversions that should probably be dropped, although we
should probably do that at a release boundary. The fundamental problem is that
schema evolution was copied the automatic conversions that Hive does rather
than a considered position. Of course dropping conversions becomes a breaking
change.
> Float to timestamp schema evolution handles time/nanoseconds incorrectly
> ------------------------------------------------------------------------
>
> Key: ORC-554
> URL: https://issues.apache.org/jira/browse/ORC-554
> Project: ORC
> Issue Type: Bug
> Reporter: László Bodor
> Assignee: László Bodor
> Priority: Major
> Attachments: ORC-554.01.patch, ORC-554.02.patch,
> ORC-554.repro.nanos.patch, ORC-554.repro.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> During ORC-539 I found a reproducible issue: [^ORC-554.repro.patch]
> seems like float to timestamp schema evolution loses nanoseconds somewhere,
> moreover, seconds are not correct in the result TimestampColumnVector
> https://issues.apache.org/jira/browse/ORC-539?focusedCommentId=16928308&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16928308
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