[
https://issues.apache.org/jira/browse/AVRO-739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14089534#comment-14089534
]
Dmitry Kovalev commented on AVRO-739:
-------------------------------------
Attaching a first draft - please review. My comments/issues:
- in its current form, the spec only provides for a precision of up to a
millisecond - this may save space and be a most universally used precision, but
modern platforms and ISO standard provide for better precision
- we could support high-precision time as a separate type on the grounds that
it is less frequently used, or we could introduce an optional "precision"
annotation which will say define a number of decimal places in second fractions
- also, whether we only support the millis or also a higher precision, in
either case your reasoning about simple names implying "canonical" use would
arguably suggest smth like "timestamp" instead of "timestamp-millis" and "time"
instead of "time-millis"? Was there a specific reason for adding "millis" in
Parquet and is it important from interop point of view if Avro adopts a
different name (as long as the actual definition is the same)?
- I didn't provide a binary representation for Timestamp-timezone as I'm not
entirely sure how it would look like and whether it will be popular at all,
compared to the string representation
- finally, re Parquet Interval type - I used to think (and ISO, Noda time etc
seem to agree) that an "interval" means an interval on a global timeline, i.e.
something with start and end at a specific instant in time, whereas what the
current wording defines is actually better called a Duration. So the question
is again - whether there was a specific reason to call it Interval in Parquet
and if naming it Duration in Avro impacts Hadoop interop?
> Add Date/Time data types
> ------------------------
>
> Key: AVRO-739
> URL: https://issues.apache.org/jira/browse/AVRO-739
> Project: Avro
> Issue Type: New Feature
> Components: spec
> Reporter: Jeff Hammerbacher
> Fix For: 1.7.8
>
> Attachments: AVRO-739-datetime-spec.xml.patch, AVRO-739.patch
>
>
--
This message was sent by Atlassian JIRA
(v6.2#6252)
