Struct AggregateExpr 

pub struct AggregateExpr {
    pub func: AggregateFunc,
    pub expr: ScalarExpr,
    pub distinct: bool,
}

Describes an aggregation expression.

Fields

func: AggregateFunc

Names the aggregation function.

expr: ScalarExpr

An expression which extracts from each row the input to func. TODO(discord9): currently unused in render phase(because AccumulablePlan remember each Aggr Expr’s input/output column), so it only used in generate KeyValPlan from AggregateExpr

distinct: bool

Should the aggregation be applied only to distinct results in each group.

Implementations

impl AggregateExpr

async fn from_substrait_agg_measures( ctx: &mut FlownodeContext, measures: &[Measure], typ: &RelationDesc, extensions: &FunctionExtensions, ) -> Result<Vec<AggregateExpr>, Error>

Convert list of Measure into Flow’s AggregateExpr

Return both the AggregateExpr and a MapFilterProject that is the final output of the aggregate function

pub async fn from_substrait_agg_func( f: &AggregateFunction, input_schema: &RelationDesc, extensions: &FunctionExtensions, filter: &Option<TypedExpr>, order_by: &Option<Vec<TypedExpr>>, distinct: bool, ) -> Result<Vec<AggregateExpr>, Error>

Convert AggregateFunction into Flow’s AggregateExpr

the returned value is a tuple of AggregateExpr and a optional ScalarExpr that if exist is the final output of the aggregate function since aggr functions like avg need to be transform to sum(x)/cast(count(x) as x_type)

Trait Implementations

impl Clone for AggregateExpr

fn clone(&self) -> AggregateExpr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AggregateExpr

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

Formats the value using the given formatter.

impl Ord for AggregateExpr

fn cmp(&self, other: &AggregateExpr) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for AggregateExpr

fn eq(&self, other: &AggregateExpr) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for AggregateExpr

fn partial_cmp(&self, other: &AggregateExpr) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Eq for AggregateExpr

impl StructuralPartialEq for AggregateExpr