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https://issues.apache.org/jira/browse/ORC-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929089#comment-16929089
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Laszlo Bodor edited comment on ORC-554 at 9/13/19 10:26 AM:
------------------------------------------------------------
meanwhile I realized that float's precision would not be enough for timestamps,
so it couldn't be supported for timestamps, is it right? [~owen.omalley],
[~prasanth_j]
I'll close this as invalid
{code}
original timestamp string: 2015-11-29 12:34:56.1
readFloat:
buffer:
[0] -30
[1] -75
[2] -84
[3] 78
bits: 1319941602
float: 1.44880051E9
result with second and nano loss: 2015-11-29 12:35:12.0
readDouble:
buffer:
[0] 102
[1] 102
[2] 6
[3] 60
[4] -68
[5] -106
[6] -43
[7] 65
bits: 4743863517709756006
double: 1.4488004961E9
result: 2015-11-29 12:34:56.1
{code}
was (Author: abstractdog):
meanwhile I realized that float's precision would not be enough for timestamps:
{code}
original timestamp string: 2015-11-29 12:34:56.1
readFloat:
buffer:
[0] -30
[1] -75
[2] -84
[3] 78
bits: 1319941602
float: 1.44880051E9
result with second and nano loss: 2015-11-29 12:35:12.0
readDouble:
buffer:
[0] 102
[1] 102
[2] 6
[3] 60
[4] -68
[5] -106
[6] -43
[7] 65
bits: 4743863517709756006
double: 1.4488004961E9
result: 2015-11-29 12:34:56.1
{code}
> 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: Laszlo Bodor
> Assignee: Laszlo Bodor
> Priority: Major
> Attachments: ORC-554.repro.patch
>
>
> 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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