Trait Dataset 

pub trait Dataset: Send + Sync {
    // Required methods
    fn row_count_hint(&self) -> Option<u64>;
    fn visit_rows_until(
        &self,
        visitor: &mut dyn FnMut(u64, &DataRow) -> Result<bool>,
    ) -> Result<()>;

    // Provided method
    fn visit_rows(
        &self,
        visitor: &mut dyn FnMut(u64, &DataRow) -> Result<()>,
    ) -> Result<()> { ... }
}

Restartable bounded dataset contract.

Required Methods

fn row_count_hint(&self) -> Option<u64>

Optional exact row count.

fn visit_rows_until( &self, visitor: &mut dyn FnMut(u64, &DataRow) -> Result<bool>, ) -> Result<()>

Visits rows in stable order until the visitor returns false.

Provided Methods

fn visit_rows( &self, visitor: &mut dyn FnMut(u64, &DataRow) -> Result<()>, ) -> Result<()>

Visits every row without requiring full materialization.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Dataset for BorrowedDataset<'_>

impl Dataset for InMemoryDataset

impl<F, I> Dataset for StreamingDataset<F>

where F: Fn() -> I + Send + Sync, I: Iterator<Item = Result<DataRow>>,