Struct FilterDescription 

pub struct FilterDescription {
    child_filter_descriptions: Vec<ChildFilterDescription>,
}

Describes how filters should be pushed down to children.

This structure contains filter descriptions for each child node, specifying:

• Which parent filters can be pushed down to each child
• Which self-generated filters should be pushed down to each child

The filter routing is determined by column analysis - filters can only be pushed to children whose schemas contain all the referenced columns.

Fields

child_filter_descriptions: Vec<ChildFilterDescription>

Implementations

impl FilterDescription

pub fn new() -> FilterDescription

Create a new empty FilterDescription

pub fn with_child(self, child: ChildFilterDescription) -> FilterDescription

Add a child filter description

pub fn from_children( parent_filters: Vec<Arc<dyn PhysicalExpr>>, children: &[&Arc<dyn ExecutionPlan>], ) -> Result<FilterDescription, DataFusionError>

Build a filter description by analyzing which parent filters can be pushed to each child. This method automatically determines filter routing based on column analysis:

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

pub fn all_unsupported( parent_filters: &[Arc<dyn PhysicalExpr>], children: &[&Arc<dyn ExecutionPlan>], ) -> FilterDescription

Mark all parent filters as unsupported for all children.

pub fn parent_filters(&self) -> Vec<Vec<PushedDownPredicate>>

pub fn self_filters(&self) -> Vec<Vec<Arc<dyn PhysicalExpr>>>

Trait Implementations

impl Clone for FilterDescription

fn clone(&self) -> FilterDescription

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for FilterDescription

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

Formats the value using the given formatter.

impl Default for FilterDescription

fn default() -> FilterDescription

Returns the “default value” for a type.