Struct ChunkMeta 

pub struct ChunkMeta {
    pub id: ChunkId,
    pub end_ns_exclusive: u64,
    pub row_count: u64,
    pub min_ts_ns: u64,
    pub max_ts_ns: u64,
    pub sealed: bool,
    pub ttl_override_ns: Option<u64>,
    pub columnar_page: Option<PageLocation>,
}

Metadata tracked per child chunk. Physical storage lives in TimeSeriesChunk keyed by (hypertable, start_ns).

Fields

id: ChunkId

end_ns_exclusive: u64

row_count: u64

min_ts_ns: u64

max_ts_ns: u64

sealed: bool

ttl_override_ns: Option<u64>

Optional per-chunk TTL override. None means “fall back to the hypertable’s default TTL”. Setting this lets mixed-TTL policies live inside the same hypertable — e.g. keep the current month of data forever but expire everything older than 90 days.

columnar_page: Option<PageLocation>

Columnar-vs-row migration discriminant (PRD #850, Phase 1). Some(loc) → this chunk was sealed columnar; its RDCC ColumnBlock lives at loc and reads decode the columnar form. None → a legacy row-stored chunk served by the entity path (read-bridge lands in #861). This MUST persist so pre-existing row-stored data is never mis-read as columnar after a restart.

Implementations

impl ChunkMeta

pub fn new(id: ChunkId, end_ns_exclusive: u64) -> ChunkMeta

pub fn format(&self) -> ChunkFormat

The chunk’s storage format — the read-bridge dispatch key (#861). Derived from the migration discriminant columnar_page: a recorded RDCC ColumnBlock location means ChunkFormat::ColumnarV1, its absence means the legacy ChunkFormat::Row form. This is the format-version gate that lets old row chunks and new columnar chunks coexist in one collection without a rewrite.

pub fn is_columnar(&self) -> bool

True when this chunk is stored in the columnar RDCC form.

pub fn observe(&mut self, ts_ns: u64)

pub fn effective_ttl_ns(&self, default_ttl_ns: Option<u64>) -> Option<u64>

Effective TTL = per-chunk override if present, otherwise the hypertable default. None = the chunk has no automatic expiry.

pub fn expiry_ns(&self, default_ttl_ns: Option<u64>) -> Option<u64>

Absolute epoch-ns at which the chunk becomes droppable. Uses max_ts_ns as the baseline — the newest row the chunk has ever accepted — so an empty chunk (no rows yet) never expires until at least one row lands.

pub fn is_expired_at(&self, now_ns: u64, default_ttl_ns: Option<u64>) -> bool

Trait Implementations

impl Clone for ChunkMeta

fn clone(&self) -> ChunkMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChunkMeta

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

Formats the value using the given formatter.