Enum DpError 

pub enum DpError {
    TooManyRelations {
        count: usize,
        max: usize,
    },
    Disconnected,
    Empty,
}

Planner errors raised by the DP.

Variants

TooManyRelations

Caller passed more relations than the DP supports.

Fields

count: usize

max: usize

Disconnected

The join graph is disconnected — no edge between any pair of relations across some split. The caller should fall back to a Cartesian-product-tolerant ordering.

Empty

Caller passed an empty relation list.

Trait Implementations

impl Debug for DpError

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

Formats the value using the given formatter.

impl Display for DpError

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

Formats the value using the given formatter.

impl Error for DpError

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.