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From "Benjamin Lerer (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-9229) Add functions to convert timeuuid to date or time
Date Tue, 28 Apr 2015 14:12:06 GMT


Benjamin Lerer updated CASSANDRA-9229:
    Attachment: CASSANDRA-9229.txt

The patch add 4 new functions {{toDate}}, {{toTime}}, {{toTimestamp}} and {{toUnixTimestamp}}
and deprecate {{dateOf}} and {{unixtimestampOf}}.
If people still use those 2 deprecated function a warning will be logged the first time the
function is called.

The patch also update the CQL documentation, the {{NEWS.txt}} and {{CHANGES.txt}} files.

> Add functions to convert timeuuid to date or time
> -------------------------------------------------
>                 Key: CASSANDRA-9229
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>            Reporter: Michaël Figuière
>            Assignee: Benjamin Lerer
>             Fix For: 3.0
>         Attachments: CASSANDRA-9229.txt
> As CASSANDRA-7523 brings the {{date}} and {{time}} native types to Cassandra, it would
be useful to add builtin function to convert {{timeuuid}} to these two new types, just like
{{dateOf()}} is doing for timestamps.
> {{timeOf()}} would extract the time component from a {{timeuuid}}. Example use case could
be at insert time with for instance {{timeOf(now())}}, as well as at read time to compare
the time component of a {{timeuuid}} column in a {{WHERE}} clause.
> The use cases would be similar for {{date}} but the solution is slightly less obvious,
as in a perfect world we would want {{dateOf()}} to convert to {{date}} and {{timestampOf()}}
for {{timestamp}}, unfortunately {{dateOf()}} already exist and convert to a {{timestamp}},
not a {{date}}. Making this change would break many existing CQL queries which is not acceptable.
Therefore we could use a different name formatting logic such as {{toDate}} or {{dateFrom}}.
We could then also consider using this new name convention for the 3 dates related types and
just have {{dateOf}} becoming a deprecated alias.

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