uqa-execution 0.4.6

Volcano physical operators with row-batch pipelines
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//
// Unified Query Algebra
//
// Copyright (c) 2023-2026 Cognica, Inc.
//

//! Constraint and partition indexes share creation reservations with every relation kind.

use super::{BTreeMap, CatalogIndexRow, IndexRegistryContext, RelationIdentity};
use uqa_storage::{StorageBackendError, StorageBackendResult};

pub(super) fn reserve_constraints(
    context: &IndexRegistryContext<'_>,
    object_id: [u8; 16],
    columns: &[uqa_sql::ast::ColumnDef],
    constraints: &mut uqa_sql::ast::TableConstraintSet,
    descendants: &mut [super::schema::OwnerChange],
) -> StorageBackendResult<()> {
    let names = crate::schema::constraints::names::ConstraintNameContext {
        catalog: context.identities.catalog,
        locks: context.identities.locks,
    };
    for (object_id, columns, constraints) in std::iter::once((object_id, columns, constraints))
        .chain(descendants.iter_mut().map(|owner| {
            (
                owner.object_id,
                owner.columns.as_slice(),
                &mut owner.constraints,
            )
        }))
    {
        names
            .reserve_changes(object_id, columns, constraints)
            .map_err(|error| StorageBackendError::backend("constraint names", error))?;
    }
    Ok(())
}

pub(super) fn reserve_new_names(
    context: &IndexRegistryContext<'_>,
    previous: &BTreeMap<RelationIdentity, CatalogIndexRow>,
    candidate: &BTreeMap<RelationIdentity, CatalogIndexRow>,
) -> StorageBackendResult<()> {
    for relation in candidate
        .keys()
        .filter(|relation| !previous.contains_key(*relation))
    {
        crate::schema::namespaces::relation_names::reserve_relation_name(
            context.identities.locks,
            relation,
            || {
                let mut resolution = context.identities.session.relation_name_resolution();
                resolution.set_lookup_mode(crate::catalog::RelationLookupMode::Bound);
                Ok(context
                    .identities
                    .catalog
                    .current_catalog_snapshot()
                    .relation_kind_resolution(&resolution, &relation.qualified_name())?
                    .into_found()
                    .is_some())
            },
        )
        .map_err(|error| StorageBackendError::backend("index name reservation", error))?;
    }
    Ok(())
}