Struct DefaultTableSource

pub struct DefaultTableSource {
    pub table_provider: Arc<dyn TableProvider>,
}

Implements TableSource for a TableProvider

This structure adapts a TableProvider (a physical plan trait) to the TableSource (logical plan trait).

It is used so logical plans in the datafusion_expr crate do not have a direct dependency on physical plans, such as TableProviders.

Fields

table_provider: Arc<dyn TableProvider>

table provider

Implementations

impl DefaultTableSource

pub fn new(table_provider: Arc<dyn TableProvider>) -> Self

Create a new DefaultTableSource to wrap a TableProvider

Trait Implementations

impl TableSource for DefaultTableSource

fn as_any(&self) -> &dyn Any

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

fn schema(&self) -> SchemaRef

Get a reference to the schema for this table

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

Get a reference to applicable constraints, if any exists.

fn table_type(&self) -> TableType

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

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

Tests whether the table provider can make use of any or all filter expressions to optimize data retrieval.

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

Get the Logical plan of this table provider, if available.

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

Get the default value for a column, if available.