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>

A filter description for each child. This includes which parent filters and which self filters (from the node in question) will get pushed down to each child.

Implementations

impl FilterDescription

pub fn new() -> Self

Create a new empty FilterDescription

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

Add a child filter description

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

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>], ) -> Self

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

Formats the value using the given formatter.

impl Default for FilterDescription

fn default() -> Self

Returns the “default value” for a type.