Enum SelectFunction 

pub enum SelectFunction {
    Documents,
    Count,
    Sum,
    Avg,
    Min,
    Max,
}

Projection function applied by SELECT. Distinct from crate::query::HavingAggregateFunction because this enum carries the document-fetch branch too — SELECT may return rows, not just aggregates — so the two can’t share a type.

Variants

Documents

Return matched rows. The default so old fixtures / builders that don’t opt in get plain document-fetch semantics.

Count

COUNT(*) when SelectProjection::field is empty, COUNT(field) (count of non-null field values) otherwise. Empty-field form is currently the only supported COUNT shape — the field-bearing form is reserved for future server capability.

Sum

SUM(field). Required field; numeric typed. Routed end-to-end through the drive sum dispatcher (no-proof and proof paths both terminate at grovedb’s aggregate-sum / sum-tree-walk primitives — see crate::query::drive_document_sum_query).

Avg

AVG(field). Required field; numeric typed. Result is f64. Routed end-to-end through the drive average dispatcher, which composes count and sum walks under the hood (no separate average primitive on the grovedb side) — see crate::query::drive_document_average_query.

Min

MIN(field) — smallest value of field in each group (or across all matching rows when group_by is empty). Required field. Currently always rejected with “not yet implemented”; semantically distinct from crate::query::HavingRankingKind::Min which is a cross-group ranking primitive on the HAVING right side.

Max

MAX(field) — symmetric to Self::Min for the largest value. Same not-yet-implemented contract; same caveat versus crate::query::HavingRankingKind::Max.

Trait Implementations

impl Clone for SelectFunction

fn clone(&self) -> SelectFunction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SelectFunction

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

Formats the value using the given formatter.

impl Default for SelectFunction

fn default() -> SelectFunction

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SelectFunction

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for SelectFunction

fn eq(&self, other: &SelectFunction) -> 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 Serialize for SelectFunction

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for SelectFunction

impl Eq for SelectFunction

impl StructuralPartialEq for SelectFunction