Enum EvalError 

pub enum EvalError {
    IndexOutOfBounds {
        index: i64,
        length: usize,
    },
    NotImplemented {
        feature: String,
    },
    NoEvalImplementation {
        function_name: String,
    },
    VariableNotFound {
        name: String,
    },
    FunctionError {
        function: String,
        error: Box<dyn Error + Send + Sync + 'static>,
    },
    ExecutionError {
        message: String,
        source: Option<Box<dyn Error + Send + Sync + 'static>>,
    },
}

Main error type for expression evaluation

Variants

IndexOutOfBounds

Array index out of bounds

Fields

index: i64

length: usize

NotImplemented

Feature not yet implemented

Fields

feature: String

NoEvalImplementation

Function has no evaluation implementation

Fields

function_name: String

VariableNotFound

Variable not found in the evaluation environment

Fields

name: String

FunctionError

Error from function evaluation - wraps any error from the function registry

Fields

function: String

error: Box<dyn Error + Send + Sync + 'static>

ExecutionError

General execution error - wraps anyhow errors and other runtime failures

Fields

message: String

source: Option<Box<dyn Error + Send + Sync + 'static>>

Implementations

impl EvalError

pub fn function_error( function: impl Into<String>, error: impl Error + Send + Sync + 'static, ) -> Self

Create a function error

pub fn execution(message: impl Into<String>) -> Self

Create an execution error from a message

pub fn execution_with_source( message: impl Into<String>, source: impl Error + Send + Sync + 'static, ) -> Self

Create an execution error with a source error

impl EvalError

pub fn is_unfoldable(&self) -> bool

Returns true if this error means the expression simply can’t be evaluated at compile time (e.g., references a column, or uses a function without an eval implementation). These are expected during constant folding and the expression should be kept as-is.

Returns false for genuine runtime errors like division by zero, index out of bounds, or type mismatches — these should be surfaced as hard failures.

Trait Implementations

impl Debug for EvalError

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

Formats the value using the given formatter.

impl Display for EvalError

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

Formats the value using the given formatter.

impl Error for EvalError

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<Error> for EvalError

fn from(err: Error) -> Self

Converts to this type from the input type.