Enum EvalError 

pub enum EvalError {
    Parse(String),
    Unsupported(String),
    UnknownColumn(String),
}

Errors raised during compile-time analysis. Runtime evaluation itself is total: every closure returns some Datum — invalid arithmetic / type mismatches surface as Datum::Null, matching SQL’s three-valued semantics on most paths.

Variants

Parse(String)

The SQL parser refused the expression.

Unsupported(String)

The expression uses a feature this evaluator doesn’t implement.

UnknownColumn(String)

An identifier didn’t resolve against the input schema.

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<EvalError> for CompileError

fn from(source: EvalError) -> Self

Converts to this type from the input type.