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Yifan Cai commented on CASSANDRA-17425:
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Hi Benjamin, the goal of this patch is to add a function to retrieve the latest
modification time of a multi-cell type. It is different from CASSANDRA-8877,
which is to retrieve the timestamp of _one_ cell from a multi-cell type and
end-user cannot tell if the retrieved timestamp is the latest.
bq. I am always a bit reluctant to add new selectors as I often had to modify
all of them to introduce new features.
I can see the concerns when I was working on the patch. It feels like the
selector framework needs some refactor, which I did not do in this patch. We
can look more closely at the patch and only commit when the majority is happy
with changes.
> Add new CQL function maxWritetime
> ---------------------------------
>
> Key: CASSANDRA-17425
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17425
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL/Syntax
> Reporter: Yifan Cai
> Assignee: Yifan Cai
> Priority: Normal
>
> The function "writetime" does not support multi-cell types, e.g. collections
> and UDT. It would be useful to enable querying the latest modified timestamp
> of a column value.
> I'd like to propose to add a new function named "maxWritetime", which returns
> the largest timestamp amongst the cells. When being applied to the single
> cell types, it returns the same result as "writetime".
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