Struct datafusion::physical_expr::tree_node::ExprContext

pub struct ExprContext<T> {
    pub expr: Arc<dyn PhysicalExpr>,
    pub data: T,
    pub children: Vec<ExprContext<T>>,
}

A node object encapsulating a PhysicalExpr node with a payload. Since there are two ways to access child plans—directly from the plan and through child nodes—it’s recommended to perform mutable operations via Self::update_expr_from_children.

Fields

expr: Arc<dyn PhysicalExpr>

The physical expression associated with this context.

data: T

Custom data payload of the node.

children: Vec<ExprContext<T>>

Child contexts of this node.

Implementations

impl<T> ExprContext<T>

pub fn new( expr: Arc<dyn PhysicalExpr>, data: T, children: Vec<ExprContext<T>> ) -> ExprContext<T>

pub fn update_expr_from_children( self ) -> Result<ExprContext<T>, DataFusionError>

impl<T> ExprContext<T>

where T: Default,

pub fn new_default(plan: Arc<dyn PhysicalExpr>) -> ExprContext<T>

Trait Implementations

impl<T> ConcreteTreeNode for ExprContext<T>

fn children(&self) -> Vec<&ExprContext<T>>

Provides read-only access to child nodes.

fn take_children(self) -> (ExprContext<T>, Vec<ExprContext<T>>)

Detaches the node from its children, returning the node itself and its detached children.

fn with_new_children( self, children: Vec<ExprContext<T>> ) -> Result<ExprContext<T>, DataFusionError>

Reattaches updated child nodes to the node, returning the updated node.

impl<T> Debug for ExprContext<T>

where T: Debug,

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

Formats the value using the given formatter.

impl<T> Display for ExprContext<T>

where T: Display,

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

Formats the value using the given formatter.