Type Alias CollectAliasMap 

pub type CollectAliasMap = HashMap<String, Vec<TraversalStep>>;

Alias → full traversal path (each level’s labels/rel-type/direction plus that level’s where predicates), resolved from the where clause so alias-based $collect.from reuses a declared traversal alias. Multi-hop aliases keep every step; alias $count/$sum share the same shape.

Aliased Type

pub struct CollectAliasMap { /* private fields */ }