Struct Aggregate 

pub struct Aggregate {
    pub group_by: Vec<Expr>,
    pub aggregates: Vec<Expr>,
}

Aggregate specification with group by and aggregate expressions.

Fields

group_by: Vec<Expr>

Expressions to group by (e.g., column references).

aggregates: Vec<Expr>

Aggregate function expressions (e.g., SUM, COUNT, AVG). Use .alias() on the expression to set output column names.

Implementations

impl Aggregate

pub fn new(group_by: Vec<Expr>, aggregates: Vec<Expr>) -> Self

Create a new Aggregate.

pub fn required_columns(&self) -> Vec<String>

Compute column names required by this aggregate.

For COUNT(*), this returns empty. For SUM(x), GROUP BY y, this returns [x, y].

Trait Implementations

impl Clone for Aggregate

fn clone(&self) -> Aggregate

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Aggregate

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.