presto-main/src/main/java/io/prestosql/operator/aggregation/ArbitraryAggregationFunction.java/ArbitraryAggregationFunction/input
class ArbitraryAggregationFunction:    public static void input(Type type, NullableBooleanState state, Block block, int position)
    {
        if (!state.isNull()) {
            return;
        }
        state.setNull(false);
        state.setBoolean(type.getBoolean(block, position));
    }