Group bys with floats fail to compile

[Micah Wylde]

create table nexmark with (
    connector = 'nexmark',
    event_rate = '5'
);

select cast(bid.price as float) 
from nexmark
group by 1;

error[E0277]: the trait bound `f32: std::cmp::Eq` is not satisfied
   --> pipeline/src/main.rs:290:5
    |
278 | #[derive(Eq, Hash, Ord)]
    |          -- in this derive macro expansion
...
290 |     pub nexmark_bid_price_: Option<f32>,
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::cmp::Eq` is not implemented for `f32`
    |
    = help: the following other types implement trait `std::cmp::Eq`:
              isize
              i8
              i16
              i32
              i64
              i128
              usize
              u8
            and 4 others
    = note: required for `std::option::Option<f32>` to implement `std::cmp::Eq`

[Micah Wylde]

Fixed in #442