presto-main/src/main/java/io/prestosql/operator/aggregation/RealSumAggregation.java/RealSumAggregation/sum
class RealSumAggregation:    @InputFunction
    public static void sum(@AggregationState NullableDoubleState state, @SqlType(StandardTypes.REAL) long value)
    {
        state.setNull(false);
        state.setDouble(state.getDouble() + intBitsToFloat((int) value));
    }