Module backend 

Pluggable query execution backend for the Redshift Data mock service.

The RedshiftQueryBackend trait abstracts SQL execution so that alternative implementations (e.g. DuckDB-backed) can be swapped in without touching the protocol layer.

The built-in InMemoryRedshiftQueryBackend is the default; it returns the same hardcoded three-row mock result (Number/Street/City) that the service used before the backend abstraction was introduced, preserving backward-compatible behavior for existing tests.

Object safety and async

Uses the same Pin<Box<dyn Future>> pattern as winterbaume-sqs/winterbaume-sns so that Arc<dyn RedshiftQueryBackend> is object-safe without the async-trait crate.

Structs

InMemoryRedshiftQueryBackend

Default in-memory backend: returns the hardcoded three-row mock result (Number/Street/City) for single statements, and an empty result for batch executions. Statements are stored with status Finished.

StatementResult

Result of executing a single SQL statement.

Traits

RedshiftQueryBackend

Pluggable backend for Redshift Data query execution.