Trait PlanParentReduceRule 

pub trait PlanParentReduceRule<C: PlanVTable>:
    Debug
    + Send
    + Sync
    + 'static {
    type Parent: PlanVTable;

    // Required method
    fn reduce_parent(
        &self,
        child: &Plan<C>,
        parent: &Plan<Self::Parent>,
        child_idx: usize,
    ) -> VortexResult<Option<PlanRef>>;
}

A metadata-only rewrite where a child plan rewrites its parent plan.

Rules return one rewrite without recursively optimizing the replacement. The plan optimizer owns traversal and drives further rewrites.

Required Associated Types

type Parent: PlanVTable

The concrete parent operator matched by this rule.

Required Methods

fn reduce_parent( &self, child: &Plan<C>, parent: &Plan<Self::Parent>, child_idx: usize, ) -> VortexResult<Option<PlanRef>>

Attempts to replace parent based on its child at child_idx.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors