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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4450) CQL3: Allow preparing the consistency level, timestamp and ttl
Date Tue, 22 Apr 2014 12:42:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13976705#comment-13976705
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Sylvain Lebresne commented on CASSANDRA-4450:
---------------------------------------------

bq. Why [timestamp] is using LongType.instance instead of TimestampType.instance?

Because TimestampType is a time in milliseconds, while [timestamp] should be in microseconds.
Besides, it's actually possible (though ill-advised unless maybe for very very specific use
casse) to use a [timestamp] that is not even a date, so it's not like TimestampType is the
absolute "true" type for that field. 

> CQL3: Allow preparing the consistency level, timestamp and ttl
> --------------------------------------------------------------
>
>                 Key: CASSANDRA-4450
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4450
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 1.2.0
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>              Labels: cql3
>             Fix For: 2.0 beta 1
>
>
> It could be useful to allow the preparation of the consitency level, the timestamp and
the ttl. I.e. to allow:
> {noformat}
> UPDATE foo SET .. USING CONSISTENCY ? AND TIMESTAMP ? AND TTL ? 
> {noformat}
> A slight concern is that when preparing a statement we return the names of the prepared
variables, but none of timestamp, ttl and consistency are reserved names currently, so returning
those as names could conflict with a column name. We can either:
> * make these reserved identifier (I have to add that I'm not a fan because at least for
"timestamp", I think that's a potentially useful and common column name).
> * use some specific special character to indicate those are not column names, like returning
"[timestamp]", "[ttl]", "[consistency]".



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