Struct CteWorkTable

pub struct CteWorkTable { /* private fields */ }

The temporary working table where the previous iteration of a recursive query is stored Naming is based on PostgreSQL’s implementation. See here for more details: www.postgresql.org/docs/11/queries-with.html#id-1.5.6.12.5.4

Implementations

impl CteWorkTable

pub fn new(name: &str, table_schema: Arc<Schema>) -> CteWorkTable

construct a new CteWorkTable with the given name and schema This schema must match the schema of the recursive term of the query Since the scan method will contain an physical plan that assumes this schema

pub fn name(&self) -> &str

The user-provided name of the CTE

pub fn schema(&self) -> Arc<Schema>

The schema of the recursive term of the query

Trait Implementations

impl Debug for CteWorkTable

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

Formats the value using the given formatter.

impl TableProvider for CteWorkTable

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

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

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

Get the LogicalPlan of this table, if available.

fn schema(&self) -> Arc<Schema>

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 = Result<Arc<dyn ExecutionPlan>, DataFusionError>> + Send + 'async_trait>>

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

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

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

Specify if DataFusion should provide filter expressions to the TableProvider to apply during the scan.

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

Get the default value for a column, if available.

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.