Struct FixedSchemaProvider 

pub struct FixedSchemaProvider { /* private fields */ }

Available on crate feature integration-tests only.

This schema provider is intended only for unit tests. It prepopulates with one table and only allows for tables named sales and purchases.

Trait Implementations

impl Debug for FixedSchemaProvider

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for FixedSchemaProvider

fn default() -> Self

Returns the “default value” for a type.

impl SchemaProvider for FixedSchemaProvider

fn as_any(&self) -> &dyn Any

Returns this SchemaProvider as Any so that it can be downcast to a specific implementation.

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

Retrieves the list of available table names in this schema.

fn table<'life0, 'life1, 'async_trait>( &'life0 self, name: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Option<Arc<dyn TableProvider>>, DataFusionError>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,

Retrieves a specific table from the schema by name, if it exists, otherwise returns None.

fn table_exist(&self, name: &str) -> bool

Returns true if table exist in the schema provider, false otherwise.

fn register_table( &self, name: String, table: Arc<dyn TableProvider>, ) -> Result<Option<Arc<dyn TableProvider>>>

If supported by the implementation, adds a new table named name to this schema.

fn deregister_table(&self, name: &str) -> Result<Option<Arc<dyn TableProvider>>>

If supported by the implementation, removes the name table from this schema and returns the previously registered TableProvider, if any.

fn owner_name(&self) -> Option<&str>

Returns the owner of the Schema, default is None. This value is reported as part of `information_tables.schemata

fn table_type<'life0, 'life1, 'async_trait>( &'life0 self, name: &'life1 str, ) -> Pin<Box<dyn Future<Output = Result<Option<TableType>, DataFusionError>> + Send + 'async_trait>>

where 'life0: 'async_trait, 'life1: 'async_trait, Self: 'async_trait,

Retrieves the type of a specific table from the schema by name, if it exists, otherwise returns None. Implementations for which this operation is cheap but Self::table is expensive can override this to improve operations that only need the type, e.g. SELECT * FROM information_schema.tables.