Trait mz_persist_types::stats::StatsFrom

source ·
pub trait StatsFrom<T> {
    // Required method
    fn stats_from(col: &T, validity: ValidityRef) -> Self;
Expand description

A source of aggregate statistics about a column of data.

Required Methods§


fn stats_from(col: &T, validity: ValidityRef) -> Self

Computes statistics from a column of data.

The validity, if given, indicates which values in the columns are and are not used for stats. This allows us to model non-nullable columns in a nullable struct. For optional columns (i.e. ones with their own validity) it must be a subset of the column’s validity, otherwise this panics.

Object Safety§

This trait is not object safe.