Struct Distinct 

pub struct Distinct<'a> {
    pub field: usize,
    pub key: &'a dyn Fn(&[u8]) -> Option<Vec<u8>>,
}

Collapse the page so only the best document per value of a stored field appears.

The key is the value’s identity, coerced — so 1 and 1.0 in a field declared f64 are one value rather than two. A document with no value for the field is its own group: DISTINCT removes documents shown to share a value, and one that has none has not been shown to share anything.

Fields

field: usize

Which declared value field identifies a group.

key: &'a dyn Fn(&[u8]) -> Option<Vec<u8>>

The identity of one stored value.

Trait Implementations

impl<'a> Clone for Distinct<'a>

fn clone(&self) -> Distinct<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Copy for Distinct<'a>