presto-main/src/main/java/io/prestosql/operator/aggregation/state/NullableDoubleStateSerializer.java/NullableDoubleStateSerializer/deserialize
class NullableDoubleStateSerializer:    @Override
    public void deserialize(Block block, int index, NullableDoubleState state)
    {
        state.setNull(false);
        state.setDouble(DOUBLE.getDouble(block, index));
    }