import { DuckDBWASMConnector, RestConnector, MosaicClient, QueryResult } from '@uwdata/mosaic-core';
import { Query } from '@uwdata/mosaic-sql';
import { Table } from 'apache-arrow';
import { DuckDBInstance, WasmDuckDBConnection } from './duckdb-wasm';
/**
 * The `MosaicDBCoordinator` class serves as a coordinator between a internal or remote DuckDB instance and the Mosaic.
 * It abstracts the connection and query execution process, offering table indexing and results caching.
 *
 * Note: This class wraps the Mosaic Coordinator to handle type incompatibility between apache-arrow v17
 * (required by DuckDB) and @uwdata/flechette (used by Mosaic 0.20+).
 *
 * @param {wasmConnector|restConnector} connector - The connector used to interface with the DuckDB instance.
 * @param {DuckDBInstance} [internalInstance] - An optional internal DuckDB instance for WASM-based operations.
 */
export declare class MosaicDBCoordinator {
    private _coordinator;
    private _internalDB;
    constructor(connector: (RestConnector | DuckDBWASMConnector), internalInstance?: DuckDBInstance);
    /**
      Static method to create a new MosaicDBCoordinator.
      @param {string | WasmDuckDBConnection} [connection] - The connection string for a remote HTTP rest DuckDB instance or an existing WasmDuckDBConnection.
      @returns {Promise} A promise that resolves to a new MosaicDBCoordinator instance.
      If no connection is provided, a internal instance of duckdb-wasm will be created.
    */
    static create(connection?: string | WasmDuckDBConnection): Promise<MosaicDBCoordinator | undefined>;
    get internalDB(): DuckDBInstance | undefined;
    connect(client: MosaicClient): void;
    disconnect(client: MosaicClient): void;
    clearCache(): void;
    destroy(): Promise<void>;
    query(query: string | Query, options?: {
        cache?: boolean;
        [k: string]: unknown;
    }): QueryResult<Table>;
}