Enum EmbedSource 

pub enum EmbedSource {
    Correlated {
        target_key: Vec<String>,
        parent_key: Vec<String>,
        key_type: ScalarFieldType,
    },
    Materialised {
        keys: Vec<String>,
    },
}

Where an embedded level’s rows come from.

Variants

Correlated

Rows of the level’s view whose target_key equals the parent row’s parent_key.

Fields

target_key: Vec<String>

The stored path on the embedded row that must equal the parent’s key.

parent_key: Vec<String>

The stored path on the parent row it is compared with.

key_type: ScalarFieldType

The declared scalar type both keys are compared as — the cast a filter on the embedded key would take, so the correlation matches the rows a predicate target_key = <the parent's value> matched when it was a flat sub-read.

Materialised

The value the parent row’s own document holds under the first of keys it has: each object element of it for EmbedShape::Many, the object itself for EmbedShape::One. The level’s view is not read.

The level’s predicate is evaluated against each element as if it were a row of the level’s view, so it may only read the element’s document: a native-column condition has no column to read here, and is refused rather than rendered. A count, an ordering and a projection are refused too — the elements keep the order the parent stored them in.

Fields

keys: Vec<String>

The parent’s stored spellings of the key, in the order they are tried.

Trait Implementations

impl Clone for EmbedSource

fn clone(&self) -> EmbedSource

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for EmbedSource

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

Formats the value using the given formatter.

impl Eq for EmbedSource

impl PartialEq for EmbedSource

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EmbedSource