Struct datafusion::datasource::empty::EmptyTable
source · pub struct EmptyTable { /* private fields */ }
Expand description
An empty plan that is useful for testing and generating plans without mapping them to actual data.
Implementations§
source§impl EmptyTable
impl EmptyTable
Trait Implementations§
source§impl TableProvider for EmptyTable
impl TableProvider for EmptyTable
source§fn as_any(&self) -> &dyn Any
fn as_any(&self) -> &dyn Any
Returns the table provider as
Any
so that it can be
downcast to a specific implementation.source§fn table_type(&self) -> TableType
fn table_type(&self) -> TableType
Get the type of this table for metadata/catalog purposes.
source§fn scan<'life0, 'life1, 'life2, 'life3, 'async_trait>(
&'life0 self,
_state: &'life1 SessionState,
projection: Option<&'life2 Vec<usize>>,
_filters: &'life3 [Expr],
_limit: Option<usize>
) -> Pin<Box<dyn Future<Output = Result<Arc<dyn ExecutionPlan>>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
'life2: 'async_trait,
'life3: 'async_trait,
fn scan<'life0, 'life1, 'life2, 'life3, 'async_trait>( &'life0 self, _state: &'life1 SessionState, projection: Option<&'life2 Vec<usize>>, _filters: &'life3 [Expr], _limit: Option<usize> ) -> Pin<Box<dyn Future<Output = Result<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 that will scan the table.
The table provider will be usually responsible of grouping
the source data into partitions that can be efficiently
parallelized or distributed.
source§fn get_table_definition(&self) -> Option<&str>
fn get_table_definition(&self) -> Option<&str>
Get the create statement used to create this table, if available.
source§fn get_logical_plan(&self) -> Option<&LogicalPlan>
fn get_logical_plan(&self) -> Option<&LogicalPlan>
Get the Logical Plan of this table, if available.
source§fn supports_filter_pushdown(
&self,
_filter: &Expr
) -> Result<TableProviderFilterPushDown>
fn supports_filter_pushdown( &self, _filter: &Expr ) -> Result<TableProviderFilterPushDown>
👎Deprecated since 20.0.0: use supports_filters_pushdown instead
Tests whether the table provider can make use of a filter expression
to optimise data retrieval.
source§fn supports_filters_pushdown(
&self,
filters: &[&Expr]
) -> Result<Vec<TableProviderFilterPushDown>>
fn supports_filters_pushdown( &self, filters: &[&Expr] ) -> Result<Vec<TableProviderFilterPushDown>>
Tests whether the table provider can make use of any or all filter expressions
to optimise data retrieval.
source§fn statistics(&self) -> Option<Statistics>
fn statistics(&self) -> Option<Statistics>
Get statistics for this table, if available
source§fn insert_into<'life0, 'life1, 'async_trait>(
&'life0 self,
_state: &'life1 SessionState,
_input: Arc<dyn ExecutionPlan>
) -> Pin<Box<dyn Future<Output = Result<Arc<dyn ExecutionPlan>>> + Send + 'async_trait>>where
Self: 'async_trait,
'life0: 'async_trait,
'life1: 'async_trait,
fn insert_into<'life0, 'life1, 'async_trait>( &'life0 self, _state: &'life1 SessionState, _input: Arc<dyn ExecutionPlan> ) -> Pin<Box<dyn Future<Output = Result<Arc<dyn ExecutionPlan>>> + Send + 'async_trait>>where Self: 'async_trait, 'life0: 'async_trait, 'life1: 'async_trait,
Return an
ExecutionPlan
to insert data into this table, if
supported. Read moreAuto Trait Implementations§
impl RefUnwindSafe for EmptyTable
impl Send for EmptyTable
impl Sync for EmptyTable
impl Unpin for EmptyTable
impl UnwindSafe for EmptyTable
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more