Struct WrappedTable 

pub struct WrappedTable { /* private fields */ }

A WrappedTable takes a Table and extends it with a number of helpful, object-safe methods for accessing a table.

It essentially acts like an extension trait: it is a separate type to allow object-safe extension methods to call methods that require Self: Sized. The implementations here downcast manually to the type used when constructing the WrappedTable.

Implementations

impl WrappedTable

pub fn dyn_clone(&self) -> Self

Clone the contents of the table.

pub fn scan_bounded( &self, subset: SubsetRef<'_>, start: Offset, n: usize, out: &mut TaggedRowBuffer, ) -> Option<Offset>

Starting at the given Offset into subset, scan up to n rows and write them to out. Return the next starting offset. If no offset is returned then the subset has been scanned completely. Rows written to out are never stale, so callers can take the buffer’s full contents.

pub fn scan_project( &self, subset: SubsetRef<'_>, cols: &[ColumnId], start: Offset, n: usize, cs: &[Constraint], out: &mut dyn RowSink, ) -> Option<Offset>

A variant fo WrappedTable::scan_bounded that projects a subset of columns and only appends rows that match the given constraints. Rows written to out are never stale, so callers can take the buffer’s full contents.

pub fn scan(&self, subset: SubsetRef<'_>) -> TaggedRowBuffer

Return the contents of the subset as a TaggedRowBuffer.

pub fn len(&self) -> usize

Return the number of rows currently stored in the table.

pub fn is_empty(&self) -> bool

Check if the table is empty.

Trait Implementations

impl Deref for WrappedTable

type Target = dyn Table

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl DerefMut for WrappedTable

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.