Struct InstanceQuery 

pub struct InstanceQuery {
    pub anchor: Name,
    pub predicate: Option<Expr>,
    pub group_by: Option<String>,
    pub project: Option<Vec<String>>,
    pub limit: Option<usize>,
    pub path: Vec<Name>,
}

A declarative query over any instance shape.

Fields

anchor: Name

Select nodes with this anchor (vertex kind).

predicate: Option<Expr>

Optional predicate on node values/fields. Evaluated in an environment with the full observable stalk: extra_fields, scalar child values via labeled edges, and metadata.

group_by: Option<String>

Optional: group results by this field name.

project: Option<Vec<String>>

Optional: project to these fields only.

limit: Option<usize>

Optional: limit results.

path: Vec<Name>

Optional: traverse edges before selecting. Each step follows an edge kind from the current position.

Trait Implementations

impl Clone for InstanceQuery

fn clone(&self) -> InstanceQuery

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InstanceQuery

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

Formats the value using the given formatter.

impl Default for InstanceQuery

fn default() -> InstanceQuery

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for InstanceQuery

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for InstanceQuery

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

where __S: Serializer,

Serialize this value into the given Serde serializer.