Struct RewriteContext 

pub struct RewriteContext { /* private fields */ }

Rewrite the context

Manage the status and node information during the rewriting process. Compared to the OptContext of the optimizer, this is a lightweight version. It does not include features specific to optimizers, such as caches for statistical information or cost calculations.

Implementations

impl RewriteContext

pub fn new() -> Self

Create a new rewriting context (using the default ExpressionContext).

pub fn with_expr_context(expr_context: Arc<ExpressionAnalysisContext>) -> Self

Create a new rewriting context (using the specified ExpressionContext).

pub fn allocate_node_id(&mut self) -> usize

Assign a new node ID

pub fn register_node( &mut self, node_id: usize, plan_node: PlanNodeEnum, ) -> Rc<RefCell<PlanNodeWrapper>>

Register a plan node

pub fn set_current_node_id(&mut self, node_id: usize)

Set the id of the node whose rules are currently being applied.

pub fn current_node_id(&self) -> usize

ID of the node whose rules are currently being applied. The plan root is registered with id 0.

pub fn find_node_by_id(&self, id: usize) -> Option<Rc<RefCell<PlanNodeWrapper>>>

Find a node by its ID

pub fn add_plan_node_mapping(&self, plan_node_id: usize, rewrite_node_id: usize)

Add node mapping

pub fn find_rewrite_id_by_plan_id(&self, plan_node_id: usize) -> Option<usize>

Find the rewrite node ID by using the planned node ID.

pub fn node_count(&self) -> usize

Get the current node count.

pub fn expr_context(&self) -> Arc<ExpressionAnalysisContext>

Obtain the context of the expression.

Trait Implementations

impl Debug for RewriteContext

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

Formats the value using the given formatter.

impl Default for RewriteContext

fn default() -> Self

Returns the “default value” for a type.