StatsCatalog

vortex_expr

Trait StatsCatalog 

Source 
pub trait StatsCatalog {
    // Provided method
    fn stats_ref(
        &mut self,
        _field_path: &FieldPath,
        _stat: Stat,
    ) -> Option<ExprRef> { ... }
}
Expand description

A catalog of available stats that are associated with field paths.

Provided Methods§

Source

fn stats_ref(&mut self, _field_path: &FieldPath, _stat: Stat) -> Option<ExprRef>

Given a field path and statistic, return an expression that when evaluated over the catalog will return that stat for the referenced field.

This is likely to be a column expression, or a literal.

Returns None if the stat is not available for the field path.

Implementors§