Struct ChildPushdownResult 

pub struct ChildPushdownResult {
    pub parent_filters: Vec<ChildFilterPushdownResult>,
    pub self_filters: Vec<Vec<PushedDownPredicate>>,
}

The result of pushing down filters into a child node.

This is the result provided to nodes in ExecutionPlan::handle_child_pushdown_result. Nodes process this result and convert it into a FilterPushdownPropagation that is returned to their parent.

Fields

parent_filters: Vec<ChildFilterPushdownResult>

The parent filters that were pushed down as received by the current node when ExecutionPlan::gather_filters_for_pushdown was called. Note that this may not be the same as the filters that were passed to the children as the current node may have modified them (e.g. by reassigning column indices) when it returned them from ExecutionPlan::gather_filters_for_pushdown in a FilterDescription. Attached to each filter is a PushedDown per child that indicates whether the filter was supported or unsupported by each child. To get combined results see ChildFilterPushdownResult::any and ChildFilterPushdownResult::all.

self_filters: Vec<Vec<PushedDownPredicate>>

The result of pushing down each filter this node provided into each of it’s children. The outer vector corresponds to each child, and the inner vector corresponds to each filter. Since this node may have generated a different filter for each child the inner vector may have different lengths or the expressions may not match at all. It is up to each node to interpret this result based on the filters it provided for each child in ExecutionPlan::gather_filters_for_pushdown.

Trait Implementations

impl Clone for ChildPushdownResult

fn clone(&self) -> ChildPushdownResult

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChildPushdownResult

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

Formats the value using the given formatter.