reifydb-catalog 0.4.13

Database catalog and metadata management for ReifyDB
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2025 ReifyDB

use std::sync::{Arc, OnceLock};

use reifydb_core::interface::catalog::{
	column::{Column, ColumnIndex},
	id::NamespaceId,
	vtable::VTable,
};
use reifydb_type::value::{constraint::TypeConstraint, r#type::Type};

use super::ids::{columns::subscriptions::*, vtable::SUBSCRIPTIONS};

/// Returns the static definition for the system.subscriptions virtual table.
///
/// This table exposes all currently active subscriptions, showing their
/// subscription ID and the number of columns in the subscription schema.
pub fn subscriptions() -> Arc<VTable> {
	static INSTANCE: OnceLock<Arc<VTable>> = OnceLock::new();

	INSTANCE.get_or_init(|| {
		Arc::new(VTable {
			id: SUBSCRIPTIONS,
			namespace: NamespaceId::SYSTEM,
			name: "subscriptions".to_string(),
			columns: vec![
				Column {
					id: ID,
					name: "id".to_string(),
					constraint: TypeConstraint::unconstrained(Type::Uint8),
					properties: vec![],
					index: ColumnIndex(0),
					auto_increment: false,
					dictionary_id: None,
				},
				Column {
					id: COLUMN_COUNT,
					name: "column_count".to_string(),
					constraint: TypeConstraint::unconstrained(Type::Uint8),
					properties: vec![],
					index: ColumnIndex(1),
					auto_increment: false,
					dictionary_id: None,
				},
			],
		})
	})
	.clone()
}