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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 { Visitor } from '../visitor';\nimport { VectorType } from '../interfaces';\nimport { Type, TimeUnit } from '../enum';\nimport { Schema, Field } from '../schema';\nimport {\n DataType, Dictionary,\n Float, Int, Date_, Interval, Time, Timestamp,\n Bool, Null, Utf8, Binary, Decimal, FixedSizeBinary,\n List, FixedSizeList, Map_, Struct, Union,\n} from '../type';\n\n/** @ignore */ const sum = (x: number, y: number) => x + y;\n/** @ignore */ const variableWidthColumnErrorMessage = (type: DataType) => `Cannot compute the byte width of variable-width column ${type}`;\n\n/** @ignore */\nexport interface ByteWidthVisitor extends Visitor {\n visit<T extends DataType>(node: T): number;\n visitMany<T extends DataType>(nodes: T[]): number[];\n getVisitFn<T extends Type> (node: T): (type: DataType<T>) => number;\n getVisitFn<T extends DataType>(node: VectorType<T> | Data<T> | T): (type: T) => number;\n}\n\n/** @ignore */\nexport class ByteWidthVisitor extends Visitor {\n public visitNull (____: Null ) { return 0; }\n public visitInt (type: Int ) { return type.bitWidth / 8; }\n public visitFloat (type: Float ) { return type.ArrayType.BYTES_PER_ELEMENT; }\n public visitBinary (type: Binary ) { throw new Error(variableWidthColumnErrorMessage(type)); }\n public visitUtf8 (type: Utf8 ) { throw new Error(variableWidthColumnErrorMessage(type)); }\n public visitBool (____: Bool ) { return 1 / 8; }\n public visitDecimal (____: Decimal ) { return 16; }\n public visitDate (type: Date_ ) { return (type.unit + 1) * 4; }\n public visitTime (type: Time ) { return type.bitWidth / 8; }\n public visitTimestamp (type: Timestamp ) { return type.unit === TimeUnit.SECOND ? 4 : 8; }\n public visitInterval (type: Interval ) { return (type.unit + 1) * 4; }\n public visitList (type: List ) { throw new Error(variableWidthColumnErrorMessage(type)); }\n public visitStruct (type: Struct ) { return this.visitFields(type.children).reduce(sum, 0); }\n public visitUnion (type: Union ) { return this.visitFields(type.children).reduce(sum, 0); }\n public visitFixedSizeBinary (type: FixedSizeBinary ) { return type.byteWidth; }\n public visitFixedSizeList (type: FixedSizeList ) { return type.listSize * this.visitFields(type.children).reduce(sum, 0); }\n public visitMap (type: Map_ ) { return this.visitFields(type.children).reduce(sum, 0); }\n public visitDictionary (type: Dictionary ) { return this.visit(type.indices); }\n public visitFields (fields: Field[] ) { return (fields || []).map((field) => this.visit(field.type)); }\n public visitSchema (schema: Schema ) { return this.visitFields(schema.fields).reduce(sum, 0); }\n}\n\n/** @ignore */\nexport const instance = new ByteWidthVisitor();\n"]} |