Module source 

Async lookup source trait. Async data source trait for lookup table refresh and query.

LookupSource is the evolution of the connector-level TableLoader trait. It uses RPITIT (Rust 1.75+) for zero-overhead async — no async_trait boxing needed.

Key differences from TableLoader

• Supports predicate pushdown via Predicate
• Supports projection pushdown via ColumnId
• Advertises capabilities via LookupSourceCapabilities
• Uses PushdownAdapter to wrap sources that lack pushdown support

Structs

LookupSourceCapabilities

Capabilities that a lookup source advertises.

PushdownAdapter

Wraps a LookupSource that doesn’t support pushdown.

Enums

LookupError

Errors from lookup source operations.

Traits

LookupSource

Async data source for lookup table refresh and query.

LookupSourceDyn

Dyn-compatible version of LookupSource for use as Arc<dyn LookupSourceDyn>.

Type Aliases

ColumnId

Column identifier for projection pushdown.