Enum SpannerReplication 

pub enum SpannerReplication {
    Full,
    Incremental {
        column: String,
        initial_value: Value,
    },
}

How the source replicates rows across runs.

Serializes as { type: full } or { type: incremental, column: "...", initial_value: ... }.

Variants

Full

Every run fetches the full result set (default).

Incremental

Only rows not yet read, in column order, resuming from the stored bookmark (or initial_value on the first run).

The source wraps the query as SELECT * FROM (<query>) AS q WHERE q.`column` >= CAST(@bookmark AS <type>) ORDER BY q.`column` (<type> is the column’s type, read from the query’s result metadata) and drops the rows it already emitted at the bookmark value, so rows that share a cursor value (ties, late commits) are never skipped. Every page carries a bookmark, so a crash replays at most one page. Write @bookmark in the query (with >=) to apply the cursor further inside it; a strict > is refused. Rows whose column is NULL are never read.

@bookmark inside the query is bound by its JSON type (a timestamp bookmark is a STRING), and Spanner does not coerce parameter types: cast it where you use it, e.g. WHERE updated_at >= TIMESTAMP(@bookmark).

Fields

column: String

Column whose value is the replication cursor (e.g. updated_at).

initial_value: Value

Lower bound (inclusive) used on the first run, before any bookmark is stored.

Trait Implementations

impl Clone for SpannerReplication

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SpannerReplication

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

Formats the value using the given formatter.

impl Default for SpannerReplication

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SpannerReplication

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl JsonSchema for SpannerReplication

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 SpannerReplication

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

Equality operator ==.

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

Inequality operator !=.

impl Serialize for SpannerReplication

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 SpannerReplication