Enum LoweringError 

pub enum LoweringError {
    UnknownFunction(String),
    UnsupportedExpr(String),
    UnboundVar(u32),
    InvalidType(String),
}

Errors that can occur when lowering an IR expression to DataFusion.

Variants

UnknownFunction(String)

A FunctionCall name has no DataFusion built-in equivalent.

UnsupportedExpr(String)

An IrExpr variant cannot be lowered yet (e.g. MapLiteral).

UnboundVar(u32)

A VarId referenced by a VarRef or PropertyAccess is not in the VarMap.

InvalidType(String)

A genuine Cypher type error caught at planning — e.g. a quantifier predicate that cannot apply to the list’s element type (x % 2 over a string list). A deliberate validation rejection (openCypher InvalidArgumentType), distinct from a capability gap. (#955)

Trait Implementations

impl Clone for LoweringError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LoweringError

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

Formats the value using the given formatter.

impl Display for LoweringError

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

Formats the value using the given formatter.

impl Error for LoweringError

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.