apache-arrow
Version:
Apache Arrow columnar in-memory format
134 lines (132 loc) • 8.91 kB
JavaScript
"use strict";
// 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.
Object.defineProperty(exports, "__esModule", { value: true });
exports.JSONVectorLoader = exports.VectorLoader = void 0;
const data_1 = require("../data");
const schema_1 = require("../schema");
const type_1 = require("../type");
const visitor_1 = require("../visitor");
const bit_1 = require("../util/bit");
const utf8_1 = require("../util/utf8");
const int_1 = require("../util/int");
const enum_1 = require("../enum");
const buffer_1 = require("../util/buffer");
/** @ignore */
class VectorLoader extends visitor_1.Visitor {
constructor(bytes, nodes, buffers, dictionaries) {
super();
this.nodesIndex = -1;
this.buffersIndex = -1;
this.bytes = bytes;
this.nodes = nodes;
this.buffers = buffers;
this.dictionaries = dictionaries;
}
visit(node) {
return super.visit(node instanceof schema_1.Field ? node.type : node);
}
visitNull(type, { length, } = this.nextFieldNode()) { return data_1.Data.Null(type, 0, length); }
visitBool(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Bool(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitInt(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Int(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitFloat(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Float(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitUtf8(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Utf8(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.readData(type)); }
visitBinary(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Binary(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.readData(type)); }
visitFixedSizeBinary(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.FixedSizeBinary(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitDate(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Date(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitTimestamp(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Timestamp(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitTime(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Time(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitDecimal(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Decimal(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitList(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.List(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.visit(type.children[0])); }
visitStruct(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Struct(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.visitMany(type.children)); }
visitUnion(type) { return type.mode === enum_1.UnionMode.Sparse ? this.visitSparseUnion(type) : this.visitDenseUnion(type); }
visitDenseUnion(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Union(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readTypeIds(type), this.readOffsets(type), this.visitMany(type.children)); }
visitSparseUnion(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Union(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readTypeIds(type), this.visitMany(type.children)); }
visitDictionary(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Dictionary(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type.indices), this.readDictionary(type)); }
visitInterval(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Interval(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readData(type)); }
visitFixedSizeList(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.FixedSizeList(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.visit(type.children[0])); }
visitMap(type, { length, nullCount } = this.nextFieldNode()) { return data_1.Data.Map(type, 0, length, nullCount, this.readNullBitmap(type, nullCount), this.readOffsets(type), this.visit(type.children[0])); }
nextFieldNode() { return this.nodes[++this.nodesIndex]; }
nextBufferRange() { return this.buffers[++this.buffersIndex]; }
readNullBitmap(type, nullCount, buffer = this.nextBufferRange()) {
return nullCount > 0 && this.readData(type, buffer) || new Uint8Array(0);
}
readOffsets(type, buffer) { return this.readData(type, buffer); }
readTypeIds(type, buffer) { return this.readData(type, buffer); }
readData(_type, { length, offset } = this.nextBufferRange()) {
return this.bytes.subarray(offset, offset + length);
}
readDictionary(type) {
return this.dictionaries.get(type.id);
}
}
exports.VectorLoader = VectorLoader;
/** @ignore */
class JSONVectorLoader extends VectorLoader {
constructor(sources, nodes, buffers, dictionaries) {
super(new Uint8Array(0), nodes, buffers, dictionaries);
this.sources = sources;
}
readNullBitmap(_type, nullCount, { offset } = this.nextBufferRange()) {
return nullCount <= 0 ? new Uint8Array(0) : bit_1.packBools(this.sources[offset]);
}
readOffsets(_type, { offset } = this.nextBufferRange()) {
return buffer_1.toArrayBufferView(Uint8Array, buffer_1.toArrayBufferView(Int32Array, this.sources[offset]));
}
readTypeIds(type, { offset } = this.nextBufferRange()) {
return buffer_1.toArrayBufferView(Uint8Array, buffer_1.toArrayBufferView(type.ArrayType, this.sources[offset]));
}
readData(type, { offset } = this.nextBufferRange()) {
const { sources } = this;
if (type_1.DataType.isTimestamp(type)) {
return buffer_1.toArrayBufferView(Uint8Array, int_1.Int64.convertArray(sources[offset]));
}
else if ((type_1.DataType.isInt(type) || type_1.DataType.isTime(type)) && type.bitWidth === 64) {
return buffer_1.toArrayBufferView(Uint8Array, int_1.Int64.convertArray(sources[offset]));
}
else if (type_1.DataType.isDate(type) && type.unit === enum_1.DateUnit.MILLISECOND) {
return buffer_1.toArrayBufferView(Uint8Array, int_1.Int64.convertArray(sources[offset]));
}
else if (type_1.DataType.isDecimal(type)) {
return buffer_1.toArrayBufferView(Uint8Array, int_1.Int128.convertArray(sources[offset]));
}
else if (type_1.DataType.isBinary(type) || type_1.DataType.isFixedSizeBinary(type)) {
return binaryDataFromJSON(sources[offset]);
}
else if (type_1.DataType.isBool(type)) {
return bit_1.packBools(sources[offset]);
}
else if (type_1.DataType.isUtf8(type)) {
return utf8_1.encodeUtf8(sources[offset].join(''));
}
return buffer_1.toArrayBufferView(Uint8Array, buffer_1.toArrayBufferView(type.ArrayType, sources[offset].map((x) => +x)));
}
}
exports.JSONVectorLoader = JSONVectorLoader;
/** @ignore */
function binaryDataFromJSON(values) {
// "DATA": ["49BC7D5B6C47D2","3F5FB6D9322026"]
// There are definitely more efficient ways to do this... but it gets the
// job done.
const joined = values.join('');
const data = new Uint8Array(joined.length / 2);
for (let i = 0; i < joined.length; i += 2) {
data[i >> 1] = parseInt(joined.substr(i, 2), 16);
}
return data;
}
//# sourceMappingURL=vectorloader.js.map