Struct FilterPushdownPropagation 

pub struct FilterPushdownPropagation<T> {
    pub filters: Vec<PushedDown>,
    pub updated_node: Option<T>,
}

The result of pushing down filters into a node.

Returned from ExecutionPlan::handle_child_pushdown_result to communicate to the optimizer:

1. What to do with any parent filters that were could not be pushed down into the children.
2. If the node needs to be replaced in the execution plan with a new node or not.

Fields

filters: Vec<PushedDown>

What filters were pushed into the parent node.

updated_node: Option<T>

The updated node, if it was updated during pushdown

Implementations

impl<T> FilterPushdownPropagation<T>

pub fn if_all(child_pushdown_result: ChildPushdownResult) -> Self

Create a new FilterPushdownPropagation that tells the parent node that each parent filter is supported if it was supported by all children.

pub fn if_any(child_pushdown_result: ChildPushdownResult) -> Self

Create a new FilterPushdownPropagation that tells the parent node that each parent filter is supported if it was supported by any child.

pub fn all_unsupported(child_pushdown_result: ChildPushdownResult) -> Self

Create a new FilterPushdownPropagation that tells the parent node that no filters were pushed down regardless of the child results.

pub fn with_parent_pushdown_result(filters: Vec<PushedDown>) -> Self

Create a new FilterPushdownPropagation with the specified filter support. This transmits up to our parent node what the result of pushing down the filters into our node and possibly our subtree was.

pub fn with_updated_node(self, updated_node: T) -> Self

Bind an updated node to the FilterPushdownPropagation. Use this when the current node wants to update itself in the tree or replace itself with a new node (e.g. one of it’s children). You do not need to call this if one of the children of the current node may have updated itself, that is handled by the optimizer.

Trait Implementations

impl<T: Clone> Clone for FilterPushdownPropagation<T>

fn clone(&self) -> FilterPushdownPropagation<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for FilterPushdownPropagation<T>

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

Formats the value using the given formatter.