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Sylvain Lebresne commented on CASSANDRA-11946:
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bq. I think we should probably use {{currentTimestamp}},{{currentDate}} and
{{currentTime}} instead
Bah, you're probably right. I'd merely suggest including a {{currentTimeuuid}}
for consistency sake, even if it's just another name for {{now}}. Should
probably create a new ticket for that though.
> Use the return type when resolving function on ambiguous calls
> --------------------------------------------------------------
>
> Key: CASSANDRA-11946
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11946
> Project: Cassandra
> Issue Type: Improvement
> Components: CQL
> Reporter: Sylvain Lebresne
>
> Currently, when we have multiple overloads of a function we only use the
> argument to try to resolve the function. When that resolution is ambiguous,
> we currently throw an error, but in many case (in the {{WHERE}} clause at
> least) we know which type the result is supposed to be so we could use that
> information to try to disambiguate.
> The main use case I'm thinking of is the {{now()}} function. Currently, we
> have it only for {{timeuuid}}. But we should likely provide the equivalent
> for other time-base types ({{timestamp}}, {{date}} and {{time}}). Except that
> currently we'd have to use other names that {{now}} and that would probably
> be a bit ugly. If we implement what's above, we'll be able to have overloads
> of {{now()}} for all date types and in many case it'll work how users want
> out of the bose (that is, {{WHERE t = now()}} will work whatever date-based
> type {{t}} is). And in the cases where you can't disambiguate, having to do
> {{(time)now()}} is not really worth than if we had a {{timeNow()}} function
> specific to the {{time}} type.
> Also, in principle the change is just a few lines of code.
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