Trait VirtualTableFactory 

pub trait VirtualTableFactory:
    Send
    + Sync
    + 'static {
    // Required methods
    fn create_boxed(&self) -> Box<dyn TableVirtual<'static> + Send + Sync>;
    fn definition(&self) -> Arc<TableVirtualDef>;
}

Factory for creating virtual table instances.

Implementations must be thread-safe and create fresh instances on each call. The factory pattern allows virtual tables to be registered once and instantiated on-demand for each query execution.

Example

struct MyTableFactory {
    definition: Arc<TableVirtualDef>,
}

impl VirtualTableFactory for MyTableFactory {
    fn create_boxed(&self) -> Box<dyn TableVirtual<'static> + Send + Sync> {
        Box::new(MyVirtualTable::new(self.definition.clone()))
    }

    fn definition(&self) -> Arc<TableVirtualDef> {
        self.definition.clone()
    }
}

Required Methods

fn create_boxed(&self) -> Box<dyn TableVirtual<'static> + Send + Sync>

Create a new virtual table instance.

Each call should return a fresh instance ready to process a new query. The returned instance must implement TableVirtual<'a> for all lifetimes.

fn definition(&self) -> Arc<TableVirtualDef>

Get the table definition (schema).

Returns the metadata including column names, types, and constraints.

Implementors

impl<F> VirtualTableFactory for IteratorVirtualTableFactory<F>

where F: Fn() -> Box<dyn TableVirtualUserIterator> + Send + Sync + 'static,

impl<T: TableVirtualUser + Clone> VirtualTableFactory for SimpleVirtualTableFactory<T>