Struct mz_sql::names::TransientResolver

source · 
pub struct TransientResolver<'a> {
    allocation: &'a BTreeMap<GlobalId, GlobalId>,
    status: Result<(), PlanError>,
}
Expand description

An AST visitor that transforms an AST that contains temporary GlobalId references to one where every temporary GlobalId has been replaced by its final allocated id, as dictated by the provided allocation

This is useful when trying to create multiple objects in a single DDL transaction and the objects that are about to be don’t have allocated GlobalIds yet. What we can do in that case is for the planner to assign temporary GlobalId::Transient identifiers to all the objects that it wants to create and use those for any interelationships.

Then, when the coordinator receives the list of plans to be executed it can batch allocate the final GlobalIds and use this TransientResolver to walk through all the ASTs and make them refer to the final GlobalIds of the objects.

Fields§

§allocation: &'a BTreeMap<GlobalId, GlobalId>

A map from transient GlobalIds to their final non-transient GlobalIds.

§status: Result<(), PlanError>

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