Enum GroupByItem 

pub enum GroupByItem {
    Expr {
        expr: Expr,
    },
    Rollup {
        exprs: Vec<Expr>,
    },
    Cube {
        exprs: Vec<Expr>,
    },
    GroupingSets {
        sets: Vec<Vec<Expr>>,
    },
}

One item of a GROUP BY list (issue #149, contract 0.13.0).

GROUP BY a, ROLLUP(b, c) is [Expr(a), Rollup([b, c])]; the planner expands the items into grouping sets by cross product (D2). GROUP BY () arrives as one GroupingSets item holding a single empty set.

Variants

Expr

Fields

expr: Expr

Rollup

Fields

exprs: Vec<Expr>

Cube

Fields

exprs: Vec<Expr>

GroupingSets

Fields

sets: Vec<Vec<Expr>>

Implementations

impl GroupByItem

pub fn exprs(&self) -> Box<dyn Iterator<Item = &Expr> + '_>

Iterate every expression contained in this item, in source order.

pub fn exprs_mut(&mut self) -> Box<dyn Iterator<Item = &mut Expr> + '_>

Mutably iterate every expression contained in this item.

Span normalization, natural-join annotation, and named-window resolution all walk this iterator so that expressions inside ROLLUP/CUBE/GROUPING SETS receive the same treatment as plain keys.

Trait Implementations

impl Clone for GroupByItem

fn clone(&self) -> GroupByItem

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GroupByItem

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for GroupByItem

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for GroupByItem

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.