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https://issues.apache.org/jira/browse/CASSANDRA-9312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benjamin Lerer updated CASSANDRA-9312:
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Labels: AdventCalendar2021 lhf (was: )
> Provide a way to retrieve the write time of a CQL row
> -----------------------------------------------------
>
> Key: CASSANDRA-9312
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9312
> Project: Cassandra
> Issue Type: New Feature
> Components: Legacy/CQL
> Reporter: Nicolas Favre-Felix
> Priority: Normal
> Labels: AdventCalendar2021, lhf
> Fix For: 4.x
>
>
> There is currently no way to retrieve the "writetime" of a CQL row. This is
> an issue for tables in which all dimensions are part of the primary key.
> Since Cassandra already stores a cell for the CQL row, it would make sense to
> provide a way to read its timestamp. This feature would be consistent with
> the concept of a row as an entity containing a number of optional columns,
> but able to exist on its own.
> +Additional information for newcomers+
> As [~slebresne] suggested in the comments, this functionality can be done by
> allowing the {{writeTime}} and {{ttl}} methods on primary key columns. To do
> that you will need to:
> * remove the check of {{Selectable.WritetimeOrTTL}} preenting the use of
> {{writeTime}} and {{ttl}} methods on primary key columns
> * add a new method like {{addWithTimestampAndTTL(ByteBuffer v, long
> writetime, int ttl)}} to {{ResultSetBuilder}} that method should populate the
> value as well as the timestamps and ttls if needed
> * In {{SelectStatement.processPartition}} retrieve the row timestamp and ttl
> from the row (they are stored in the primaryKeyLivenessInfo) and call the new
> {{ResultSetBuilder}} method with those information.
> * Adds some unit tests in {{SelectTest}}.
>
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