Module scan 

Scan operators.

TableScan pulls rows from any RowSource in fixed-size batches. The trait is the integration seam: the engine implements it over its in-memory and SQLite-backed table state, the FDW layer implements it over MemoryHandler / DuckDBHandler / ArrowHandler, and tests can implement it directly over an in-memory Vec<ResultRow>.

Structs

PhysicalVecSource

In-memory positional source that preserves a structured RowSchema and shared physical row fragments without round-tripping through named maps.

RowIteratorScan

Physical scan over a fallible row iterator. Unlike VecSource, this adapter preserves producer backpressure and late errors without requiring a cardinality-sized staging vector.

TableScan

TableScan: a leaf operator that drains its RowSource.

VecSource

In-memory source from a precomputed Vec<ResultRow>. Useful for tests and for materialising CTE bodies.

Traits

RowSource

Source of rows feeding a TableScan. Implementors typically own a snapshot of the underlying table or external relation; the scan operator holds the source as a boxed trait object so callers can mix and match implementations across one query.