Trait GroupCriteria 

pub trait GroupCriteria {
    // Required method
    fn group_for(&self, headers: &Headers, row: &Row) -> u64;
}

Types implementing this trait can be used to group rows in a row stream, both for group() and adjacent_group()

Required Methods

fn group_for(&self, headers: &Headers, row: &Row) -> u64

Compute the hash of a given row as u64.

Implementations on Foreign Types

impl GroupCriteria for [&str]

fn group_for(&self, headers: &Headers, row: &Row) -> u64

impl<const N: usize> GroupCriteria for [&str; N]

fn group_for(&self, headers: &Headers, row: &Row) -> u64

Implementors

impl<H, F> GroupCriteria for F

where F: Fn(&Headers, &Row) -> H, H: Hash,