Struct Channel 

pub struct Channel {
    pub field: String,
    pub ty: Option<FieldType>,
    pub aggregate: Option<Aggregate>,
    pub time_unit: Option<TimeUnit>,
    pub bin: Option<BinValue>,
}

Fields

field: String

ty: Option<FieldType>

Inferred from the data when omitted.

aggregate: Option<Aggregate>

time_unit: Option<TimeUnit>

Calendar-truncation bucketing for a temporal x on a bar mark: each value is floored to the unit’s boundary, keeping the calendar prefix ("month" maps 2026-06-14 to 2026-06, NOT Vega-Lite’s cyclic “all Junes”). Bar-only, x-only this cycle — every other placement is a teaching error (see compile). Inferred nothing when omitted.

bin: Option<BinValue>

Histogram binning for a quantitative x on a bar mark: true (automatic nice bins), {"maxbins": N}, or {"step": w}. false is accepted and means absent. Bar-only, x-only this cycle — every other placement is a teaching error (see compile). Value ranges are validated in preflight (not serde) so an out-of-range knob teaches instead of bouncing generically.

Trait Implementations

impl Debug for Channel

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Channel

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.