Struct RowHashContract 

pub struct RowHashContract {
    pub column: String,
    pub covered: RowHash,
    pub render: String,
}

What a run’s COL_ROW_HASH column actually covers, travelling with the data in the run manifest and the journal.

Without it a reader can only probe that the column EXISTS, and existence says nothing about coverage: a hash over (id, status) compared against a re-extraction of (id, status, amount) is a valid-looking column that silently attests a different text.

The coverage is recorded as the SPEC, not as a resolved list. row_hash: true means “every column this part projects”, and the part’s schema is in the part — resolving it here would duplicate a fact the data already carries, and would go stale the moment the projection changes.

Fields

column: String

The materialized column’s name (always COL_ROW_HASH today; recorded rather than assumed so a reader never has to guess).

covered: RowHash

The declared coverage, exactly as configured.

render: String

The rendering’s identity — see ROW_HASH_RENDER_ID.

Implementations

impl RowHashContract

pub fn of(spec: &RowHash) -> Option<Self>

The contract for a run’s meta_columns.row_hash, or None when no hash column is written.

Trait Implementations

impl Clone for RowHashContract

fn clone(&self) -> RowHashContract

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RowHashContract

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for RowHashContract

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for RowHashContract

impl JsonSchema for RowHashContract

fn schema_name() -> Cow<'static, str>

The name of the generated JSON Schema.

fn schema_id() -> Cow<'static, str>

Returns a string that uniquely identifies the schema produced by this type.

fn json_schema(generator: &mut SchemaGenerator) -> Schema

Generates a JSON Schema for this type.

fn inline_schema() -> bool

Whether JSON Schemas generated for this type should be included directly in parent schemas, rather than being re-used where possible using the $ref keyword.

impl PartialEq for RowHashContract

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for RowHashContract

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for RowHashContract