Struct deltalake::datafusion::catalog::MemoryCatalogProvider

pub struct MemoryCatalogProvider { /* private fields */ }

Simple in-memory implementation of a catalog.

Implementations

impl MemoryCatalogProvider

pub fn new() -> MemoryCatalogProvider

Instantiates a new MemoryCatalogProvider with an empty collection of schemas.

Trait Implementations

impl CatalogProvider for MemoryCatalogProvider

fn as_any(&self) -> &(dyn Any + 'static)

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 Default for MemoryCatalogProvider

fn default() -> MemoryCatalogProvider

Returns the “default value” for a type.