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1 | /* istanbul ignore file */ |
2 | ||
3 | // Licensed to the Apache Software Foundation (ASF) under one | |
4 | // or more contributor license agreements. See the NOTICE file | |
5 | // distributed with this work for additional information | |
6 | // regarding copyright ownership. The ASF licenses this file | |
7 | // to you under the Apache License, Version 2.0 (the | |
8 | // "License"); you may not use this file except in compliance | |
9 | // with the License. You may obtain a copy of the License at | |
10 | // | |
11 | // http://www.apache.org/licenses/LICENSE-2.0 | |
12 | // | |
13 | // Unless required by applicable law or agreed to in writing, | |
14 | // software distributed under the License is distributed on an | |
15 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
16 | // KIND, either express or implied. See the License for the | |
17 | // specific language governing permissions and limitations | |
18 | // under the License. | |
19 | ||
20 | import { Data } from '../data'; | |
21 | import { Visitor } from '../visitor'; | |
22 | import { VectorType } from '../interfaces'; | |
23 | import { Type, TimeUnit } from '../enum'; | |
24 | import { Schema, Field } from '../schema'; | |
25 | import { | |
26 | DataType, Dictionary, | |
27 | Float, Int, Date_, Interval, Time, Timestamp, | |
28 | Bool, Null, Utf8, Binary, Decimal, FixedSizeBinary, | |
29 | List, FixedSizeList, Map_, Struct, Union, | |
30 | } from '../type'; | |
31 | ||
32 | /** @ignore */ const sum = (x: number, y: number) => x + y; | |
33 | /** @ignore */ const variableWidthColumnErrorMessage = (type: DataType) => `Cannot compute the byte width of variable-width column ${type}`; | |
34 | ||
35 | /** @ignore */ | |
36 | export interface ByteWidthVisitor extends Visitor { | |
37 | visit<T extends DataType>(node: T): number; | |
38 | visitMany<T extends DataType>(nodes: T[]): number[]; | |
39 | getVisitFn<T extends Type> (node: T): (type: DataType<T>) => number; | |
40 | getVisitFn<T extends DataType>(node: VectorType<T> | Data<T> | T): (type: T) => number; | |
41 | } | |
42 | ||
43 | /** @ignore */ | |
44 | export class ByteWidthVisitor extends Visitor { | |
45 | public visitNull (____: Null ) { return 0; } | |
46 | public visitInt (type: Int ) { return type.bitWidth / 8; } | |
47 | public visitFloat (type: Float ) { return type.ArrayType.BYTES_PER_ELEMENT; } | |
48 | public visitBinary (type: Binary ) { throw new Error(variableWidthColumnErrorMessage(type)); } | |
49 | public visitUtf8 (type: Utf8 ) { throw new Error(variableWidthColumnErrorMessage(type)); } | |
50 | public visitBool (____: Bool ) { return 1 / 8; } | |
51 | public visitDecimal (____: Decimal ) { return 16; } | |
52 | public visitDate (type: Date_ ) { return (type.unit + 1) * 4; } | |
53 | public visitTime (type: Time ) { return type.bitWidth / 8; } | |
54 | public visitTimestamp (type: Timestamp ) { return type.unit === TimeUnit.SECOND ? 4 : 8; } | |
55 | public visitInterval (type: Interval ) { return (type.unit + 1) * 4; } | |
56 | public visitList (type: List ) { throw new Error(variableWidthColumnErrorMessage(type)); } | |
57 | public visitStruct (type: Struct ) { return this.visitFields(type.children).reduce(sum, 0); } | |
58 | public visitUnion (type: Union ) { return this.visitFields(type.children).reduce(sum, 0); } | |
59 | public visitFixedSizeBinary (type: FixedSizeBinary ) { return type.byteWidth; } | |
60 | public visitFixedSizeList (type: FixedSizeList ) { return type.listSize * this.visitFields(type.children).reduce(sum, 0); } | |
61 | public visitMap (type: Map_ ) { return this.visitFields(type.children).reduce(sum, 0); } | |
62 | public visitDictionary (type: Dictionary ) { return this.visit(type.indices); } | |
63 | public visitFields (fields: Field[] ) { return (fields || []).map((field) => this.visit(field.type)); } | |
64 | public visitSchema (schema: Schema ) { return this.visitFields(schema.fields).reduce(sum, 0); } | |
65 | } | |
66 | ||
67 | /** @ignore */ | |
68 | export const instance = new ByteWidthVisitor(); |