apache-arrow/schema.mjs.map

Apache Arrow columnar in-memory format

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Licensed to the Apache Software Foundation (ASF) under one\n// or more contributor license agreements.  See the NOTICE file\n// distributed with this work for additional information\n// regarding copyright ownership.  The ASF licenses this file\n// to you under the Apache License, Version 2.0 (the\n// \"License\"); you may not use this file except in compliance\n// with the License.  You may obtain a copy of the License at\n//\n//   http://www.apache.org/licenses/LICENSE-2.0\n//\n// Unless required by applicable law or agreed to in writing,\n// software distributed under the License is distributed on an\n// \"AS IS\" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY\n// KIND, either express or implied.  See the License for the\n// specific language governing permissions and limitations\n// under the License.\n\nimport { Data } from './data';\nimport { Vector } from './vector';\nimport { DataType } from './type';\nimport { selectArgs } from './util/args';\nimport { selectFieldArgs } from './util/args';\nimport { instance as comparer } from './visitor/typecomparator';\n\ntype VectorMap = { [key: string]: Vector };\ntype Fields<T extends { [key: string]: DataType }> = (keyof T)[] | Field<T[keyof T]>[];\ntype ChildData<T extends { [key: string]: DataType }> = T[keyof T][] | Data<T[keyof T]>[] | Vector<T[keyof T]>[];\n\nexport class Schema<T extends { [key: string]: DataType } = any> {\n\n    public static from<T extends { [key: string]: DataType } = any>(children: T): Schema<T>;\n    public static from<T extends VectorMap = any>(children: T): Schema<{ [P in keyof T]: T[P]['type'] }>;\n    public static from<T extends { [key: string]: DataType } = any>(children: ChildData<T>, fields?: Fields<T>): Schema<T>;\n    /** @nocollapse */\n    public static from(...args: any[]) {\n        return Schema.new(args[0], args[1]);\n    }\n\n    public static new<T extends { [key: string]: DataType } = any>(children: T): Schema<T>;\n    public static new<T extends VectorMap = any>(children: T): Schema<{ [P in keyof T]: T[P]['type'] }>;\n    public static new<T extends { [key: string]: DataType } = any>(children: ChildData<T>, fields?: Fields<T>): Schema<T>;\n    /** @nocollapse */\n    public static new(...args: any[]) {\n        return new Schema(selectFieldArgs(args)[0]);\n    }\n\n    public readonly fields: Field<T[keyof T]>[];\n    public readonly metadata: Map<string, string>;\n    public readonly dictionaries: Map<number, DataType>;\n\n    constructor(fields: Field[] = [],\n                metadata?: Map<string, string> | null,\n                dictionaries?: Map<number, DataType> | null) {\n        this.fields = (fields || []) as Field<T[keyof T]>[];\n        this.metadata = metadata || new Map();\n        if (!dictionaries) {\n            dictionaries = generateDictionaryMap(fields);\n        }\n        this.dictionaries = dictionaries;\n    }\n    public get [Symbol.toStringTag]() { return 'Schema'; }\n    public toString() {\n        return `Schema<{ ${this.fields.map((f, i) => `${i}: ${f}`).join(', ')} }>`;\n    }\n\n    public compareTo(other?: Schema | null): other is Schema<T> {\n        return comparer.compareSchemas(this, other);\n    }\n\n    public select<K extends keyof T = any>(...columnNames: K[]) {\n        const names = columnNames.reduce((xs, x) => (xs[x] = true) && xs, Object.create(null));\n        return new Schema<{ [P in K]: T[P] }>(this.fields.filter((f) => names[f.name]), this.metadata);\n    }\n    public selectAt<K extends T[keyof T] = any>(...columnIndices: number[]) {\n        return new Schema<{ [key: string]: K }>(columnIndices.map((i) => this.fields[i]).filter(Boolean), this.metadata);\n    }\n\n    public assign<R extends { [key: string]: DataType } = any>(schema: Schema<R>): Schema<T & R>;\n    public assign<R extends { [key: string]: DataType } = any>(...fields: (Field<R[keyof R]> | Field<R[keyof R]>[])[]): Schema<T & R>;\n    public assign<R extends { [key: string]: DataType } = any>(...args: (Schema<R> | Field<R[keyof R]> | Field<R[keyof R]>[])[]) {\n\n        const other = args[0] instanceof Schema ? args[0] as Schema<R>\n            : new Schema<R>(selectArgs<Field<R[keyof R]>>(Field, args));\n\n        const curFields = [...this.fields] as Field[];\n        const metadata = mergeMaps(mergeMaps(new Map(), this.metadata), other.metadata);\n        const newFields = other.fields.filter((f2) => {\n            const i = curFields.findIndex((f) => f.name === f2.name);\n            return ~i ? (curFields[i] = f2.clone({\n                metadata: mergeMaps(mergeMaps(new Map(), curFields[i].metadata), f2.metadata)\n            })) && false : true;\n        }) as Field[];\n\n        const newDictionaries = generateDictionaryMap(newFields, new Map());\n\n        return new Schema<T & R>(\n            [...curFields, ...newFields], metadata,\n            new Map([...this.dictionaries, ...newDictionaries])\n        );\n    }\n}\n\nexport class Field<T extends DataType = any> {\n\n    public static new<T extends DataType = any>(props: { name: string | number, type: T, nullable?: boolean, metadata?: Map<string, string> | null }): Field<T>;\n    public static new<T extends DataType = any>(name: string | number | Field<T>, type: T, nullable?: boolean, metadata?: Map<string, string> | null): Field<T>;\n    /** @nocollapse */\n    public static new<T extends DataType = any>(...args: any[]) {\n        let [name, type, nullable, metadata] = args;\n        if (args[0] && typeof args[0] === 'object') {\n            ({ name } = args[0]);\n            (type === undefined) && (type = args[0].type);\n            (nullable === undefined) && (nullable = args[0].nullable);\n            (metadata === undefined) && (metadata = args[0].metadata);\n        }\n        return new Field<T>(`${name}`, type, nullable, metadata);\n    }\n\n    public readonly type: T;\n    public readonly name: string;\n    public readonly nullable: boolean;\n    public readonly metadata: Map<string, string>;\n\n    constructor(name: string, type: T, nullable = false, metadata?: Map<string, string> | null) {\n        this.name = name;\n        this.type = type;\n        this.nullable = nullable;\n        this.metadata = metadata || new Map();\n    }\n\n    public get typeId() { return this.type.typeId; }\n    public get [Symbol.toStringTag]() { return 'Field'; }\n    public toString() { return `${this.name}: ${this.type}`; }\n    public compareTo(other?: Field | null): other is Field<T> {\n        return comparer.compareField(this, other);\n    }\n    public clone<R extends DataType = T>(props: { name?: string | number, type?: R, nullable?: boolean, metadata?: Map<string, string> | null }): Field<R>;\n    public clone<R extends DataType = T>(name?: string | number | Field<T>, type?: R, nullable?: boolean, metadata?: Map<string, string> | null): Field<R>;\n    public clone<R extends DataType = T>(...args: any[]) {\n        let [name, type, nullable, metadata] = args;\n        (!args[0] || typeof args[0] !== 'object')\n            ? ([name = this.name, type = this.type, nullable = this.nullable, metadata = this.metadata] = args)\n            : ({name = this.name, type = this.type, nullable = this.nullable, metadata = this.metadata} = args[0]);\n        return Field.new<R>(name, type, nullable, metadata);\n    }\n}\n\n/** @ignore */\nfunction mergeMaps<TKey, TVal>(m1?: Map<TKey, TVal> | null, m2?: Map<TKey, TVal> | null): Map<TKey, TVal> {\n    return new Map([...(m1 || new Map()), ...(m2 || new Map())]);\n}\n\n/** @ignore */\nfunction generateDictionaryMap(fields: Field[], dictionaries = new Map<number, DataType>()): Map<number, DataType> {\n\n    for (let i = -1, n = fields.length; ++i < n;) {\n        const field = fields[i];\n        const type = field.type;\n        if (DataType.isDictionary(type)) {\n            if (!dictionaries.has(type.id)) {\n                dictionaries.set(type.id, type.dictionary);\n            } else if (dictionaries.get(type.id) !== type.dictionary) {\n                throw new Error(`Cannot create Schema containing two different dictionaries with the same Id`);\n            }\n        }\n        if (type.children && type.children.length > 0) {\n            generateDictionaryMap(type.children, dictionaries);\n        }\n    }\n\n    return dictionaries;\n}\n\n// Add these here so they're picked up by the externs creator\n// in the build, and closure-compiler doesn't minify them away\n(Schema.prototype as any).fields = null;\n(Schema.prototype as any).metadata = null;\n(Schema.prototype as any).dictionaries = null;\n\n(Field.prototype as any).type = null;\n(Field.prototype as any).name = null;\n(Field.prototype as any).nullable = null;\n(Field.prototype as any).metadata = null;\n"]}