Enum ViewAccessError 

pub enum ViewAccessError {
    OutOfBounds {
        index: usize,
        len: usize,
        field_name: Option<&'static str>,
    },
    UnexpectedNull {
        index: usize,
        field_name: Option<&'static str>,
    },
    TypeMismatch {
        expected: DataType,
        actual: DataType,
        field_name: Option<&'static str>,
    },
}

Error type for view access failures when reading from Arrow arrays.

Variants

OutOfBounds

Index out of bounds

Fields

index: usize

The invalid index

len: usize

The array length

field_name: Option<&'static str>

Optional field name for context

UnexpectedNull

Unexpected null value

Fields

index: usize

The index where null was found

field_name: Option<&'static str>

Optional field name for context

TypeMismatch

Type mismatch during array downcast

Fields

expected: DataType

Expected Arrow DataType

actual: DataType

Actual Arrow DataType

field_name: Option<&'static str>

Optional field name for context

Trait Implementations

impl Clone for ViewAccessError

fn clone(&self) -> ViewAccessError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ViewAccessError

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

Formats the value using the given formatter.

impl Display for ViewAccessError

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

Formats the value using the given formatter.

impl Error for ViewAccessError

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<Infallible> for ViewAccessError

Available on crate feature views only.

Allows generic code to uniformly handle both infallible and fallible view-to-owned conversions.

When converting views to owned types, primitives and String never fail (TryFrom<Primitive, Error = Infallible>), while nested structs can fail (TryFrom<StructView, Error = ViewAccessError>). This blanket conversion allows generic code like List<T> or Map<K, V> to use a single implementation with E: Into<ViewAccessError> bounds that works for both cases.

The empty match is safe because Infallible is an uninhabited type that can never be constructed.

fn from(x: Infallible) -> Self

Converts to this type from the input type.

impl From<ViewAccessError> for SchemaError

Available on crate feature views only.

fn from(err: ViewAccessError) -> Self

Converts to this type from the input type.