Struct Merger 

pub struct Merger { /* private fields */ }

Merges prepared stripes into a writer’s dictionaries and statistics without the writer.

Handed out by Writer::merger. With it, a load that shares one writer between many threads holds the writer’s lock only to write, and two stripes merge at once as long as they are on different columns. A stripe merged here is written with Writer::write as usual, and that is where its rows are counted in.

Implementations

impl Merger

pub fn merge(&self, prepared: Prepared) -> Result<Merged>

Writer::merge, one column lock at a time instead of the writer.

Errors

If the stripe was prepared for a table of other columns, or the table was closed.

pub fn give_back(&self, paged: &mut Paged) -> Result<()>

Puts a stripe’s encoded dictionary blocks back, so that Writer::write does not wait on a column’s lock while it holds its own.

Errors

If a block comes back to a column without a dictionary, or comes back twice.

Trait Implementations

impl Clone for Merger

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Merger

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

Formats the value using the given formatter.