apache-arrow/io/node/reader.d.ts

Apache Arrow columnar in-memory format

/// <reference types="node" />
import { DataType } from '../../type';
import { Duplex, DuplexOptions } from 'stream';
import { AsyncByteQueue } from '../../io/stream';
import { RecordBatchReader } from '../../ipc/reader';
/** @ignore */
export declare function recordBatchReaderThroughNodeStream<T extends {
    [key: string]: DataType;
} = any>(options?: DuplexOptions & {
    autoDestroy: boolean;
}): RecordBatchReaderDuplex<T>;
/** @ignore */
declare type CB = (error?: Error | null | undefined) => void;
/** @ignore */
declare class RecordBatchReaderDuplex<T extends {
    [key: string]: DataType;
} = any> extends Duplex {
    private _pulling;
    private _autoDestroy;
    private _reader;
    private _asyncQueue;
    constructor(options?: DuplexOptions & {
        autoDestroy: boolean;
    });
    _final(cb?: CB): void;
    _write(x: any, _: string, cb: CB): boolean;
    _read(size: number): void;
    _destroy(err: Error | null, cb: (error: Error | null) => void): void;
    _open(source: AsyncByteQueue): Promise<import("../../ipc/reader").RecordBatchFileReader<T> | import("../../ipc/reader").AsyncRecordBatchStreamReader<T>>;
    _pull(size: number, reader: RecordBatchReader<T>): Promise<boolean>;
}
export {};