So I did tests with various functions in this list and it would appear that functions that take arguments will fail outright but the ones that don't will give.... unexpected results.
The following will all give the same answer:
index=summary title=lead_summary _time<now()
index=summary title=lead_summary _time<true()
index=summary title=lead_summary _time<false()
index=summary title=lead_summary _time<pi()
If you put greater than or you put equals to, they fail. This is an obvious bug since, at the very least, pi() shouldn't even be comparable to _time.
It would appear Iguinn is only partially right, but the documentation does not reflect that.
The documentation states,
You can use these functions with the eval, fieldformat, and where commands, and as part of evaluation expressions.
This does not state:
You must use those in eval, fieldformat, and where commands.
This should be clarified.
As I do not have the ability to make this the answer, hopefully, others will see this full and complete answer.
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