Struct SubLink 

pub struct SubLink {
    pub kind: SubLinkKind,
    pub test: Option<Expr>,
    pub query: Query,
    pub alternative: Option<Box<SubLink>>,
}

A subquery in an expression, as SubLink.

Fields

kind: SubLinkKind

test: Option<Expr>

testexpr: for ANY, ALL and a row comparison, the test of each row of the subquery. It compares the left side with ExprKind::SubColumn.

query: Query

alternative: Option<Box<SubLink>>

For a correlated EXISTS, the same test as ANY on a subquery that reads no column of the query, as convert_EXISTS_to_ANY makes it. The planner fills it and runs the subquery that costs less, as an AlternativeSubPlan.

Trait Implementations

impl Clone for SubLink

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SubLink

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

Formats the value using the given formatter.

impl PartialEq for SubLink

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SubLink