Struct ExportRequest 

pub struct ExportRequest<'a> {
    pub query: &'a str,
    pub incremental: Option<&'a IncrementalCursorPlan>,
    pub cursor: Option<&'a CursorState>,
    pub tuning: &'a SourceTuning,
    pub column_overrides: &'a ColumnOverrides,
    pub page_limit: Option<usize>,
}

Read-only inputs for a single export call.

Packs the parameters that used to live as 5 positional args on Source::export into a named struct. sink is not part of this struct — it is &mut and conceptually the output channel, separate from the read-only request configuration.

Fields

query: &'a str

Already-materialized SQL (after resolve_query). The driver still wraps it with the dialect-specific incremental predicate via [crate::source::query::build_incremental_query] when incremental is set.

incremental: Option<&'a IncrementalCursorPlan>

cursor: Option<&'a CursorState>

tuning: &'a SourceTuning

column_overrides: &'a ColumnOverrides

Per-column type declarations from rivet.yaml (exports[].columns:). Drivers apply them during schema building so e.g. a NUMERIC column without declared precision can still be exported as Decimal128(18,2) when the user has stated the type explicitly.

page_limit: Option<usize>

Keyset (seek) pagination page size (OPT-4). When Some(n) and incremental carries the key plan, the driver builds one keyset page (WHERE key > cursor ORDER BY key LIMIT n) instead of the unbounded incremental/snapshot query. The keyset runner drives the outer loop.