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>,
    },
    Custom(Box<dyn Error + Send + Sync + 'static>),
}

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

Custom(Box<dyn Error + Send + Sync + 'static>)

Custom user-defined error from domain-specific validation

This variant allows custom types (newtypes) to wrap their own error types while still using the common ViewAccessError type. The error can be downcast to the specific type when needed.

Trait Implementations

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.