<A extends SimpleAggregator, T> Class<? extends Number> getAggregatorUnit(Class<A> klass) {
    try {
      A aggregator = (A) CONSTRUCTORS.get(klass).newInstance("forAggregatorTypeDiscoveryOnly");
      return aggregator.getValueType();
    } catch (Exception ex) {
      throw new RuntimeException(ex);
    }
  }
< A extends SimpleAggregator , T > Class < ? extends Number > getAggregatorUnit ( Class < A > klass ) { try { A aggregator = ( A ) CONSTRUCTORS . get ( klass ) . newInstance ( "forAggregatorTypeDiscoveryOnly" ) ; return aggregator . getValueType ( ) ; } catch ( Exception ex ) { throw new RuntimeException ( ex ) ; } }
Returns the unit type of an aggregator value. Typically Long or Double.

@param klass the aggregator class.
@return the unit type of an aggregator value.