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column.ts
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column.ts
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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 { Data } from './data';
import { Field } from './schema';
import { DataType } from './type';
import { Vector } from './vector';
import { Clonable, Sliceable, Applicative } from './vector';
import { VectorCtorArgs, VectorType as V } from './interfaces';
import { Chunked, SearchContinuation } from './vector/chunked';
export interface Column<T extends DataType = any> {
concat(...others: Vector<T>[]): Column<T>;
slice(begin?: number, end?: number): Column<T>;
clone(chunks?: Vector<T>[], offsets?: Uint32Array): Column<T>;
}
export class Column<T extends DataType = any>
extends Chunked<T>
implements Clonable<Column<T>>,
Sliceable<Column<T>>,
Applicative<T, Column<T>> {
public static new<T extends DataType>(data: Data<T>, ...args: VectorCtorArgs<V<T>>): Column<T>;
public static new<T extends DataType>(field: string | Field<T>, ...chunks: (Vector<T> | Vector<T>[])[]): Column<T>;
public static new<T extends DataType>(field: string | Field<T>, data: Data<T>, ...args: VectorCtorArgs<V<T>>): Column<T>;
/** @nocollapse */
public static new<T extends DataType = any>(...args: any[]) {
let [field, data, ...rest] = args as [
string | Field<T>,
Data<T> | Vector<T> | (Data<T> | Vector<T>)[],
...any[]
];
if (typeof field !== 'string' && !(field instanceof Field)) {
data = <Data<T> | Vector<T> | (Data<T> | Vector<T>)[]> field;
field = '';
}
const chunks = Chunked.flatten<T>(
Array.isArray(data) ? [...data, ...rest] :
data instanceof Vector ? [data, ...rest] :
[Vector.new(data, ...rest)]
);
if (typeof field === 'string') {
const type = chunks[0].data.type;
field = new Field(field, type, true);
} else if (!field.nullable && chunks.some(({ nullCount }) => nullCount > 0)) {
field = field.clone({ nullable: true });
}
return new Column(field, chunks);
}
constructor(field: Field<T>, vectors: Vector<T>[] = [], offsets?: Uint32Array) {
vectors = Chunked.flatten<T>(...vectors);
super(field.type, vectors, offsets);
this._field = field;
if (vectors.length === 1 && !(this instanceof SingleChunkColumn)) {
return new SingleChunkColumn(field, vectors[0], this._chunkOffsets);
}
}
protected _field: Field<T>;
protected _children?: Column[];
public get field() { return this._field; }
public get name() { return this._field.name; }
public get nullable() { return this._field.nullable; }
public get metadata() { return this._field.metadata; }
public clone(chunks = this._chunks) {
return new Column(this._field, chunks);
}
public getChildAt<R extends DataType = any>(index: number): Column<R> | null {
if (index < 0 || index >= this.numChildren) { return null; }
let columns = this._children || (this._children = []);
let column: Column<R>, field: Field<R>, chunks: Vector<R>[];
if (column = columns[index]) { return column; }
if (field = ((this.type.children || [])[index] as Field<R>)) {
chunks = this._chunks
.map((vector) => vector.getChildAt<R>(index))
.filter((vec): vec is Vector<R> => vec != null);
if (chunks.length > 0) {
return (columns[index] = new Column<R>(field, chunks));
}
}
return null;
}
}
/** @ignore */
class SingleChunkColumn<T extends DataType = any> extends Column<T> {
protected _chunk: Vector<T>;
constructor(field: Field<T>, vector: Vector<T>, offsets?: Uint32Array) {
super(field, [vector], offsets);
this._chunk = vector;
}
public search(index: number): [number, number] | null;
public search<N extends SearchContinuation<Chunked<T>>>(index: number, then?: N): ReturnType<N>;
public search<N extends SearchContinuation<Chunked<T>>>(index: number, then?: N) {
return then ? then(this, 0, index) : [0, index];
}
public isValid(index: number): boolean {
return this._chunk.isValid(index);
}
public get(index: number): T['TValue'] | null {
return this._chunk.get(index);
}
public set(index: number, value: T['TValue'] | null): void {
this._chunk.set(index, value);
}
public indexOf(element: T['TValue'], offset?: number): number {
return this._chunk.indexOf(element, offset);
}
}