Struct MongrelProvider 

pub struct MongrelProvider { /* private fields */ }

A MongrelDB table exposed to DataFusion. Holds the live Table behind a mutex; each scan takes a fresh MVCC snapshot.

Implementations

impl MongrelProvider

pub fn new(db: Arc<Mutex<Table>>) -> Result<Self>

pub fn arrow_schema(&self) -> SchemaRef

Trait Implementations

impl Debug for MongrelProvider

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

Formats the value using the given formatter.

impl TableProvider for MongrelProvider

fn supports_filters_pushdown( &self, filters: &[&Expr], ) -> DFResult<Vec<TableProviderFilterPushDown>>

Tell DataFusion which filters the pushdown serves exactly so it does not double-filter (and, for ann_search, never evaluates the no-op UDF). LIKE/FM is Inexact: the FM pushdown is a substring superset, so DataFusion must still re-apply the real wildcard semantics.

fn schema(&self) -> SchemaRef

Get a reference to the schema for this table

fn table_type(&self) -> TableType

Get the type of this table for metadata/catalog purposes.

fn scan<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, _state: &'life1 dyn Session, projection: Option<&'life2 Vec<usize>>, filters: &'life3 [Expr], _limit: Option<usize>, ) -> Pin<Box<dyn Future<Output = DFResult<Arc<dyn ExecutionPlan>>> + Send + 'async_trait>>

where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait, 'life2: 'async_trait, 'life3: 'async_trait,

Create an ExecutionPlan for scanning the table with optional projection, filter, and limit, described below.

fn constraints(&self) -> Option<&Constraints>

Get a reference to the constraints of the table. Returns:

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

Get the create statement used to create this table, if available.

fn get_logical_plan(&self) -> Option<Cow<'_, LogicalPlan>>

Get the LogicalPlan of this table, if available.

fn get_column_default(&self, _column: &str) -> Option<&Expr>

Get the default value for a column, if available.

fn scan_with_args<'a, 'life0, 'life1, 'async_trait>( &'life0 self, state: &'life1 dyn Session, args: ScanArgs<'a>, ) -> Pin<Box<dyn Future<Output = Result<ScanResult, DataFusionError>> + Send + 'async_trait>>

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

Create an ExecutionPlan for scanning the table using structured arguments.

fn statistics(&self) -> Option<Statistics>

Get statistics for this table, if available Although not presently used in mainline DataFusion, this allows implementation specific behavior for downstream repositories, in conjunction with specialized optimizer rules to perform operations such as re-ordering of joins.

fn insert_into<'life0, 'life1, 'async_trait>( &'life0 self, _state: &'life1 dyn Session, _input: Arc<dyn ExecutionPlan>, _insert_op: InsertOp, ) -> Pin<Box<dyn Future<Output = Result<Arc<dyn ExecutionPlan>, DataFusionError>> + Send + 'async_trait>>

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

Return an ExecutionPlan to insert data into this table, if supported.

fn delete_from<'life0, 'life1, 'async_trait>( &'life0 self, _state: &'life1 dyn Session, _filters: Vec<Expr>, ) -> Pin<Box<dyn Future<Output = Result<Arc<dyn ExecutionPlan>, DataFusionError>> + Send + 'async_trait>>

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

Delete rows matching the filter predicates.

fn update<'life0, 'life1, 'async_trait>( &'life0 self, _state: &'life1 dyn Session, _assignments: Vec<(String, Expr)>, _filters: Vec<Expr>, ) -> Pin<Box<dyn Future<Output = Result<Arc<dyn ExecutionPlan>, DataFusionError>> + Send + 'async_trait>>

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

Update rows matching the filter predicates.

fn truncate<'life0, 'life1, 'async_trait>( &'life0 self, _state: &'life1 dyn Session, ) -> Pin<Box<dyn Future<Output = Result<Arc<dyn ExecutionPlan>, DataFusionError>> + Send + 'async_trait>>

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

Remove all rows from the table.