Enum RowOrder 

pub enum RowOrder {
    Declared,
    Unspecified,
    Unknown,
}

Whether the rows a statement produces come back in an order it asked for.

Three answers rather than a boolean, because “we could not tell” is a different thing from “it did not ask” and a caller that folds them together makes the wrong mistake somewhere. A differential harness comparing two engines wants to sort both sides when the order is unspecified and to compare as written when it is declared, and for the third case it has to pick, which is a policy decision that belongs to the harness and not here.

Variants

Declared

The statement has a top level ORDER BY, so the order is part of the answer.

Unspecified

It parses, it has no top level ORDER BY, and so any order is a correct one.

Unknown

It does not parse here, so there is nothing to read the answer off.

Trait Implementations

impl Clone for RowOrder

fn clone(&self) -> RowOrder

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for RowOrder

impl Debug for RowOrder

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

Formats the value using the given formatter.

impl Eq for RowOrder

impl PartialEq for RowOrder

fn eq(&self, other: &RowOrder) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for RowOrder