Struct Keys 

pub struct Keys {
    seen: HashSet<(u64, u64)>,
    flags: u8,
    full: bool,
}

A set of hashed keys, deduplicated so the filter is sized by what it holds.

The trace filter gets its dedup from adjacency and needs none of this. An attribute filter cannot: http.route = GET /cart recurs on a third of the rows in a block and nowhere near adjacently, so without a set the filter would be sized for a million rows holding five values.

Fields

seen: HashSet<(u64, u64)>

flags: u8

full: bool

Implementations

impl Keys

pub fn insert(&mut self, h: (u64, u64))

pub fn flag(&mut self, bit: u8)

pub fn build(&self) -> Option<Vec<u8>>

Trait Implementations

impl Default for Keys

fn default() -> Keys

Returns the “default value” for a type.