Struct CacheColumns 

pub struct CacheColumns {
    pub timestamps: Vec<i64>,
    pub agents: Vec<String>,
    pub event_types: Vec<EventType>,
    pub item_ids: Vec<String>,
    pub parents: Vec<String>,
    pub itc: Vec<String>,
    pub values: Vec<String>,
}

All event columns for a batch of events, decomposed by type.

Each field holds one column of data (in event order). The i-th element of each column corresponds to the i-th event in the batch.

Construction

Build with CacheColumns::from_events. Consume with [CacheColumns::to_column_slices] for encoding.

Fields

timestamps: Vec<i64>

Wall-clock timestamps in microseconds since Unix epoch.

agents: Vec<String>

Agent identifier strings.

event_types: Vec<EventType>

Event type discriminants.

item_ids: Vec<String>

Item ID strings.

parents: Vec<String>

Parent hash lists — each element is a comma-joined string of parent hashes (empty string for root events).

itc: Vec<String>

ITC stamp strings.

values: Vec<String>

JSON-serialised event payload strings.

Implementations

impl CacheColumns

pub fn from_events(events: &[Event]) -> Result<Self, Error>

Decompose a slice of events into parallel columns.

Errors

Returns an error if any event’s data fails to serialise to JSON.

pub fn into_events(self) -> Result<Vec<Event>, String>

Reconstruct events from parallel column data.

All columns must have the same length. Parent hashes are split on commas; the empty string yields an empty parent list (root event).

Errors

Returns an error string if:

• Column lengths differ.
• An item ID string is not a valid ItemId.
• A value JSON string cannot be parsed as the event’s data payload.

pub const fn len(&self) -> usize

Return the number of events (rows) in this column set.

pub const fn is_empty(&self) -> bool

Return true if there are no events in this column set.

impl CacheColumns

pub fn row(&self, index: usize) -> Option<ColumnRow>

Extract a single row by index.

Returns None if index >= self.len().

pub fn event_types(&self) -> &[EventType]

Return only the event types column (useful for count-by-type queries).

pub fn timestamps(&self) -> &[i64]

Return only the timestamps column (useful for range queries).

Trait Implementations

impl Clone for CacheColumns

fn clone(&self) -> CacheColumns

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CacheColumns

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

Formats the value using the given formatter.

impl Default for CacheColumns

fn default() -> CacheColumns

Returns the “default value” for a type.