Enum CostError 

pub enum CostError {
    MissingDim {
        node: String,
        dim: String,
    },
    Edge {
        node: String,
        edge: String,
        rows: u64,
    },
    KvDtype(String),
}

2026-09-29: Why a node could not be estimated.

Variants

MissingDim

2026-09-29: A dim the op’s cost needs.

Fields

node: String

2026-09-29: Node id.

dim: String

2026-09-29: The dim.

Edge

2026-09-29: An edge whose rows do not evaluate or whose bytes do not divide.

Fields

node: String

2026-09-29: Node id.

edge: String

2026-09-29: Edge id.

rows: u64

2026-09-29: Rows.

KvDtype(String)

2026-09-29: A KV-cache dtype the estimate has no element size for.

Trait Implementations

impl Clone for CostError

fn clone(&self) -> CostError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CostError

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

Formats the value using the given formatter.

impl Display for CostError

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

Formats the value using the given formatter.

impl Error for CostError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl From<CostError> for HwError

fn from(source: CostError) -> Self

Converts to this type from the input type.

impl From<CostError> for VennError

fn from(source: CostError) -> Self

Converts to this type from the input type.

impl PartialEq for CostError

fn eq(&self, other: &CostError) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for CostError

impl StructuralPartialEq for CostError