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From "Benjamin Lerer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11873) Add duration type
Date Fri, 17 Jun 2016 08:27:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11873?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15335673#comment-15335673
] 

Benjamin Lerer commented on CASSANDRA-11873:
--------------------------------------------

My proposal is the following:
* Support for: year, month, week, day, hour, minute, second, millisecond, microsecond and
nanosecond  (as {{Time}} support nanosecond precision) by encoding separatly months, days
and nanoseconds (I guess:16 bytes with custom comparator).
* Support for simple litterals with the following symbols:
** {{y}}: years
** {{M}}: months
** {{w}}: weeks
** {{d}}: days
** {{h}}: hours
** {{m}}: minutes
** {{s}}: seconds
** {{ms}}: milliseconds
** {{┬Ás}} or {{us}}: microseconds
** {{ns}}: nanoseconds
* Additional support for ISO 8601 "format with designators" and ISO 8601 "alternative format"

So the following litterals will be supported:
|1y2M3d4h5m6s| CQL format for: 1 year 2 months 3 days 4 hours 5 minutes 6 seconds|
|P1Y2M3DT4H5M6S| ISO 8601 "format with designators"|
|P0001-02-03T04:05:06| ISO 8601 "alternative format"|

Does it statisfies everybody?

> Add duration type
> -----------------
>
>                 Key: CASSANDRA-11873
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11873
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: CQL
>            Reporter: Benjamin Lerer
>            Assignee: Benjamin Lerer
>              Labels: client-impacting, doc-impacting
>             Fix For: 3.x
>
>
> For CASSANDRA-11871 or to allow queries with {{WHERE}} clause like:
> {{... WHERE reading_time < now() - 2h}}, we need to support some duration type.
> In my opinion, it should be represented internally as a number of microseconds.



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