/**
 * Copyright (c) 2020-present, Goldman Sachs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { type Hashable, type Pair } from '@finos/legend-shared';
import type { Operation, TableAlias } from './RelationalOperationElement.js';
import type { Database } from './Database.js';
export declare const SELF_JOIN_TABLE_NAME = "{target}";
export declare const SELF_JOIN_SCHEMA_NAME = "default";
export declare const SELF_JOIN_ALIAS_PREFIX = "t_";
export declare class Join implements Hashable {
    owner: Database;
    name: string;
    /**
     * Target is used to show the direction of the join. Since cross table join is symmetrical in nature,
     * the direction is not required at all, whereas for self-join, the direction really matters
     */
    target?: TableAlias | undefined;
    /**
     * This is an optimization for looking up tables/views involved in a join.
     * Normally, it has 2 pairs (A,B) and (B,A)
     */
    aliases: Pair<TableAlias, TableAlias>[];
    operation: Operation;
    constructor(name: string, operation: Operation);
    get hashCode(): string;
}
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