Enum ChangeEvent 

pub enum ChangeEvent {
    Upsert {
        table: TableName,
        key: RowKey,
    },
    Delete {
        table: TableName,
        key: RowKey,
    },
}

What happened to a row, identified only by its table and primary key.

Events are deliberately thin: they name the row, not its contents. The engine re-reads the current row — and resolves the document’s joins and aggregates — at assembly time. This keeps every mechanism (WAL, polling, …) identical from the engine’s point of view and avoids depending on a table’s REPLICA IDENTITY to carry old or new values.

Note that the mechanism reports raw per-table changes. Mapping a change in a joined or junction table back to the parent documents that must be rebuilt is the document layer’s job — not something this layer knows.

There is no distinct “snapshot” variant: an initial backfill is a separate finite stream of Upserts (see ChangeCapture::snapshot), so the engine knows it is seeding from which stream it is draining, not from the event.

Variants

Upsert

A row was inserted or updated.

Fields

table: TableName

key: RowKey

Delete

A row was deleted.

Fields

table: TableName

key: RowKey

Trait Implementations

impl Clone for ChangeEvent

fn clone(&self) -> ChangeEvent

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChangeEvent

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

Formats the value using the given formatter.