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

Apache Arrow columnar in-memory format

/// <reference types="node" />
import { Duplex } from 'stream';
import { DataType } from '../../type.js';
import { Builder, BuilderOptions } from '../../builder.js';
/** @ignore */
export interface BuilderDuplexOptions<T extends DataType = any, TNull = any> extends BuilderOptions<T, TNull> {
    autoDestroy?: boolean;
    highWaterMark?: number;
    queueingStrategy?: 'bytes' | 'count';
    dictionaryHashFunction?: (value: any) => string | number;
    valueToChildTypeId?: (builder: Builder<T, TNull>, value: any, offset: number) => number;
}
/** @ignore */
export declare function builderThroughNodeStream<T extends DataType = any, TNull = any>(options: BuilderDuplexOptions<T, TNull>): BuilderDuplex<any, TNull>;
/** @ignore */
declare type CB = (error?: Error | null | undefined) => void;
/** @ignore */
declare class BuilderDuplex<T extends DataType = any, TNull = any> extends Duplex {
    private _finished;
    private _numChunks;
    private _desiredSize;
    private _builder;
    private _getSize;
    constructor(builder: Builder<T, TNull>, options: BuilderDuplexOptions<T, TNull>);
    _read(size: number): void;
    _final(cb?: CB): void;
    _write(value: any, _: string, cb?: CB): boolean;
    _destroy(err: Error | null, cb?: (error: Error | null) => void): void;
    private _maybeFlush;
}
export {};