Struct PhysicalPlanningContext 

pub struct PhysicalPlanningContext { /* private fields */ }

Context used while converting a logical plan subtree into a physical plan.

Unlike ExecutionProps, which applies to the overall planning and execution of a query, this context can differ between recursively planned subtrees. It currently carries:

• the state needed to create physical expressions for Expr::ScalarSubquery nodes that read from a shared ScalarSubqueryResults container, and
• the qualifiers assigned to the Expr::LambdaVariables that are in scope.

The physical planner builds this context from the set of uncorrelated scalar subqueries it has scheduled for a subtree. It is then passed explicitly through create_physical_expr so that function can find the slot index for each Subquery. While planning the body of a lambda, create_physical_expr extends the context with the lambda’s parameters via Self::with_qualified_lambda_variables.

An empty PhysicalPlanningContext (the Default) is what every non-physical-planner caller passes; if such a caller encounters a scalar subquery, create_physical_expr returns a not_impl_err.

Implementations

impl PhysicalPlanningContext

pub fn new( indexes: HashMap<Subquery, SubqueryIndex>, results: ScalarSubqueryResults, ) -> Self

Create a PhysicalPlanningContext from an index map and a shared results container. The index map must use the same indices as slots in results.

pub fn index_of(&self, subquery: &Subquery) -> Option<SubqueryIndex>

Returns the slot index assigned to subquery, if any.

pub fn results(&self) -> &ScalarSubqueryResults

Returns the shared results container.

pub fn with_qualified_lambda_variables( self, qualifier: &TableReference, variables: &[String], ) -> Self

Adds a mapping for each variable to the given qualifier. Existing variables with conflicting names are shadowed.

pub fn lambda_variable_qualifier(&self, name: &str) -> Option<&TableReference>

Returns the qualifier of the lambda variable name, if it is in scope.

Trait Implementations

impl Clone for PhysicalPlanningContext

fn clone(&self) -> PhysicalPlanningContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PhysicalPlanningContext

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

Formats the value using the given formatter.

impl Default for PhysicalPlanningContext

fn default() -> PhysicalPlanningContext

Returns the “default value” for a type.