Struct ChildFilterDescription 

pub struct ChildFilterDescription {
    pub(crate) parent_filters: Vec<PushedDownPredicate>,
    pub(crate) self_filters: Vec<Arc<dyn PhysicalExpr>>,
}

Describes filter pushdown for a single child node.

This structure contains two types of filters:

• Parent filters: Filters received from the parent node, marked as supported or unsupported
• Self filters: Filters generated by the current node to be pushed down to this child

Fields

parent_filters: Vec<PushedDownPredicate>

self_filters: Vec<Arc<dyn PhysicalExpr>>

Implementations

impl ChildFilterDescription

pub fn from_child( parent_filters: &[Arc<dyn PhysicalExpr>], child: &Arc<dyn ExecutionPlan>, ) -> Result<ChildFilterDescription, DataFusionError>

Build a child filter description by analyzing which parent filters can be pushed to a specific child.

This method performs column analysis to determine which filters can be pushed down:

• If all columns referenced by a filter exist in the child’s schema, it can be pushed down
• Otherwise, it cannot be pushed down to that child

See FilterDescription::from_children for more details

pub fn with_self_filter( self, filter: Arc<dyn PhysicalExpr>, ) -> ChildFilterDescription

Add a self filter (from the current node) to be pushed down to this child.

pub fn with_self_filters( self, filters: Vec<Arc<dyn PhysicalExpr>>, ) -> ChildFilterDescription

Add multiple self filters.

Trait Implementations

impl Clone for ChildFilterDescription

fn clone(&self) -> ChildFilterDescription

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChildFilterDescription

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

Formats the value using the given formatter.