Struct ExistsOpts 

pub struct ExistsOpts {
    pub scalar: bool,
}

Options for a where_exists / where_not_exists correlated subquery — an extensible struct so the common case stays where_exists(f) and opt-in behaviors ride a ..Default::default() struct via the _with variants.

Fields

scalar: bool

Fold this EXISTS as a build-time scalar subquery (SCALAR-SUBQUERY-DESIGN.md): when the child binds a statically-unique key, the resolver reads it once, inlines the correlation value as a literal, and deletes the join. Snapshot semantics — the inlined value does not react to later child changes (design §3). Default false (a live EXISTS join).

Trait Implementations

impl Clone for ExistsOpts

fn clone(&self) -> ExistsOpts

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExistsOpts

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

Formats the value using the given formatter.

impl Default for ExistsOpts

fn default() -> ExistsOpts

Returns the “default value” for a type.

impl PartialEq for ExistsOpts

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ExistsOpts

impl Eq for ExistsOpts

impl StructuralPartialEq for ExistsOpts