Enum Source 

pub enum Source {
    State(Vec<Arc<str>>),
    View(OpId),
    Catalogue,
}

Where a table’s rows are read from.

Variants

State(Vec<Arc<str>>)

A path of field names from the accumulator to a collection, or to the accumulator itself.

Read from the state value the fold produced, not from an arrangement: a base table’s rows are the fold’s collection, and a scan is O(rows) in any database.

View(OpId)

A plan operator that does not read the session, read from the maintained dataflow.

This is the one that earns the engine its keep: the rows of a derived table are whatever the arrangement holds, and the arrangement was maintained for the page.

Catalogue

The schema describing itself.

Trait Implementations

impl Clone for Source

fn clone(&self) -> Source

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Source

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Source

fn eq(&self, other: &Source) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for Source

impl StructuralPartialEq for Source