count

com.apama.aggregates
Aggregate count`(TYPE arg)` `integer`

Parameters:: arg - Nothing, a boolean predicate, or a float or decimal (deprecated).

Return the number of items in the window, optionally with modifications.

If the window is empty returns 0.

With no argument: return the number of items in the window.
With a boolean argument: count the number of items for which the predicate is true.
With a float or decimal argument: count the number of items where the argument is not NaN. This mode is deprecated in favor of count(not arg.isNaN()).