Struct LayoutWriterContext 

pub struct LayoutWriterContext { /* private fields */ }

State shared by every strategy participating in a single layout write.

Clones share the BufferedBytesTracker while retaining the array serialization context. Passing this context through the strategy tree keeps writer-scoped state independent of the strategy instances, which may be shared by multiple leaves or writers.

Implementations

impl LayoutWriterContext

pub fn new(array_ctx: ArrayContext) -> Self

Creates a context for a layout write with a fresh buffered bytes tracker.

pub fn with_allowed_aggregates(self, allowed: HashSet<AggregateFnId>) -> Self

Restrict the aggregate functions this write may record, e.g. in a zone map.

A write that would record an aggregate outside allowed fails, matching the array and layout contexts: a silently thinner zone map is a file that prunes worse than the caller asked for, with nothing in the output saying so. The id set is a plain set of ids — callers that source it from editions resolve it themselves.

pub fn allows_aggregate(&self, aggregate: &AggregateFnId) -> bool

Returns whether aggregate may be recorded by this write. Unrestricted contexts permit every aggregate.

pub fn with_buffered_bytes_tracker(self, tracker: BufferedBytesTracker) -> Self

Replaces the buffered bytes tracker, so callers can observe the counter from outside the strategy tree.

pub fn array_ctx(&self) -> &ArrayContext

Returns the array serialization context.

pub fn buffered_bytes_tracker(&self) -> &BufferedBytesTracker

Returns the tracker that accounts for bytes retained by layout strategies.

pub fn buffered_bytes(&self) -> u64

Returns the number of bytes currently retained by layout strategies.

pub fn reserve_buffered_bytes(&self, bytes: u64) -> BufferedBytesReservation

Records bytes as retained by this write until the returned reservation is dropped.

Trait Implementations

impl Clone for LayoutWriterContext

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl From<Interner> for LayoutWriterContext

fn from(array_ctx: ArrayContext) -> Self

Converts to this type from the input type.