now - Get the current time as a timestamp

The now function gets the current time at query execution time. This has some important features:

now will return a nonsecond timestamp, if the runtime supports it. Otherwise, it uses millisecond.
now is consistent no matter where it is invoked in the query, even multiple invocations.

Syntax

now(): timestamp

Using now is a simple function without any arguments:

create now_time from now()

It is sometimes useful to know exactly how long it has been since a log was written. This can be done using now:

create time_since_write from now() - $m.timestamp

This will create a field time_since_write which is of type interval.

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