Function mz_transform::reduction_pushdown::lookup_corresponding_component

source ยท 
fn lookup_corresponding_component(
    expr: &MirScalarExpr,
    old_join_mapper: &JoinInputMapper,
    input_component_map: &BTreeMap<usize, usize>,
) -> Option<usize>
Expand description

Returns None if expr does not belong to exactly one component.