sizeOfSet (Function)
Returns the size of an object of type java.util.Set.
Syntax
<INT> sizeOfSet(<OBJECT> set)
Query Parameters
| Name | Description | Default Value | Possible Data Types | Optional | Dynamic |
|---|---|---|---|---|---|
| set | The set object. This parameter should be of type java.util.Set. A set object may be created by the set attribute aggregator. | OBJECT | No | Yes |
Example 1
insert into initStream
select initSet(symbol) as initialSet
from stockStream;
insert into distinctStockStream
select union(initialSet) as distinctSymbols
from initStream WINDOW TUMBLING_TIME(10 sec);
insert into sizeStream
select sizeOfSet(distinctSymbols) sizeOfSymbolSet
from distinctStockStream;
The sizeStream stream will output the number of distinct stock symbols received during a sliding window of 10 seconds.