Struct Preparer 

pub struct Preparer { /* private fields */ }

Encodes stripes for one Writer without the writer.

Handed out by Writer::preparer and cheap to hold. It shares with its writer which varchar columns still have a global dictionary, so a stripe prepared after the first one decided a column should not have one is encoded plainly from the start.

Implementations

impl Preparer

pub fn prepare(&self, parts: Vec<((u64, u64), Chunk)>) -> Result<Prepared>

Encodes a run of chunks as one stripe, as far as it can be without the writer.

The run is what Writer::append_stripe takes, and the rules are the same: it is a stripe of its own, and the orders have to come out in source order once the stripes are sorted. An empty chunk is dropped.

Errors

If the run is longer than STRIPE_PARTS, a chunk’s columns are not the table’s, or one cannot be encoded.

Trait Implementations

impl Clone for Preparer

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 Preparer

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

Formats the value using the given formatter.