pub fn columnar_exchange<K, V, T, D>(
((k, _), _, _): &<((K, V), T, D) as Columnar>::Ref<'_>,
) -> u64
Expand description
An exchange function for columnar tuples of the form ((K, V), T, D)
. Rust has a hard
time to figure out the lifetimes of the elements when specified as a closure, so we rather
specify it as a function.