Struct query::dummy_catalog::DummyCatalogProvider

struct DummyCatalogProvider {
    schema: DummySchemaProvider,
}

A dummy catalog provider for DummyCatalogList.

Fields

schema: DummySchemaProvider

Trait Implementations

impl CatalogProvider for DummyCatalogProvider

fn as_any(&self) -> &dyn Any

Returns the catalog provider as Any so that it can be downcast to a specific implementation.

fn schema_names(&self) -> Vec<String>

Retrieves the list of available schema names in this catalog.

fn schema(&self, _name: &str) -> Option<Arc<dyn SchemaProvider>>

Retrieves a specific schema from the catalog by name, provided it exists.

fn register_schema( &self, name: &str, schema: Arc<dyn SchemaProvider>, ) -> Result<Option<Arc<dyn SchemaProvider>>, DataFusionError>

Adds a new schema to this catalog.

fn deregister_schema( &self, _name: &str, _cascade: bool, ) -> Result<Option<Arc<dyn SchemaProvider>>, DataFusionError>

Removes a schema from this catalog. Implementations of this method should return errors if the schema exists but cannot be dropped. For example, in DataFusion’s default in-memory catalog, [MemoryCatalogProvider], a non-empty schema will only be successfully dropped when cascade is true. This is equivalent to how DROP SCHEMA works in PostgreSQL.

impl Clone for DummyCatalogProvider

fn clone(&self) -> DummyCatalogProvider

Returns a copy of the value.

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

Performs copy-assignment from source.