public DoubleMaxGroupedAccumulator(int valueChannel)
{
// Min/max are not effected by distinct, so ignore it.
super(valueChannel, SINGLE_DOUBLE, SINGLE_DOUBLE, Optional.<Integer>absent(), Optional.<Integer>absent());
this.notNull = new BooleanBigArray();
this.maxValues = new DoubleBigArray(Double.NEGATIVE_INFINITY);
}