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https://issues.apache.org/jira/browse/ARROW-887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17657920#comment-17657920
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Rok Mihevc commented on ARROW-887:
----------------------------------
This issue has been migrated to [issue
#16491|https://github.com/apache/arrow/issues/16491] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [format] For backward compatibility, new unit fields must have default values
> matching previous implied unit
> ------------------------------------------------------------------------------------------------------------
>
> Key: ARROW-887
> URL: https://issues.apache.org/jira/browse/ARROW-887
> Project: Apache Arrow
> Issue Type: Bug
> Components: Format
> Reporter: Julien Le Dem
> Assignee: Julien Le Dem
> Priority: Major
> Fix For: 0.3.0
>
>
> Flatbuffer "defaults the default value" to 0. Which means we interpret
> previously serialized Flatbuf has having the first element of the enum. In
> particular Date and Time unit fields end up being read as DateUnit.DAY and
> TimeUnit.SECOND when the previous implied unit was MILLISECOND for both.
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