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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 { BN } from '../util/bn.mjs';
import { Vector } from '../vector.mjs';
import { Visitor } from '../visitor.mjs';
import { BufferType } from '../enum.mjs';
import { UnionMode, DateUnit, TimeUnit } from '../enum.mjs';
import { BitIterator, getBit, getBool } from '../util/bit.mjs';
import { DataType, } from '../type.mjs';
/** @ignore */
export class JSONVectorAssembler extends Visitor {
/** @nocollapse */
static assemble(...batches) {
const assemlber = new JSONVectorAssembler();
return batches.map(({ schema, data }) => {
return assemlber.visitMany(schema.fields, data.children);
});
}
visit({ name }, data) {
const { length } = data;
const { offset, nullCount, nullBitmap } = data;
const type = DataType.isDictionary(data.type) ? data.type.indices : data.type;
const buffers = Object.assign([], data.buffers, { [BufferType.VALIDITY]: undefined });
return Object.assign({ 'name': name, 'count': length, 'VALIDITY': DataType.isNull(type) ? undefined
: nullCount <= 0 ? Array.from({ length }, () => 1)
: [...new BitIterator(nullBitmap, offset, length, null, getBit)] }, super.visit(data.clone(type, offset, length, 0, buffers)));
}
visitNull() { return {}; }
visitBool({ values, offset, length }) {
return { 'DATA': [...new BitIterator(values, offset, length, null, getBool)] };
}
visitInt(data) {
return {
'DATA': data.type.bitWidth < 64
? [...data.values]
: [...bigNumsToStrings(data.values, 2)]
};
}
visitFloat(data) {
return { 'DATA': [...data.values] };
}
visitUtf8(data) {
return { 'DATA': [...new Vector([data])], 'OFFSET': [...data.valueOffsets] };
}
visitBinary(data) {
return { 'DATA': [...binaryToString(new Vector([data]))], OFFSET: [...data.valueOffsets] };
}
visitFixedSizeBinary(data) {
return { 'DATA': [...binaryToString(new Vector([data]))] };
}
visitDate(data) {
return {
'DATA': data.type.unit === DateUnit.DAY
? [...data.values]
: [...bigNumsToStrings(data.values, 2)]
};
}
visitTimestamp(data) {
return { 'DATA': [...bigNumsToStrings(data.values, 2)] };
}
visitTime(data) {
return {
'DATA': data.type.unit < TimeUnit.MICROSECOND
? [...data.values]
: [...bigNumsToStrings(data.values, 2)]
};
}
visitDecimal(data) {
return { 'DATA': [...bigNumsToStrings(data.values, 4)] };
}
visitList(data) {
return {
'OFFSET': [...data.valueOffsets],
'children': this.visitMany(data.type.children, data.children)
};
}
visitStruct(data) {
return {
'children': this.visitMany(data.type.children, data.children)
};
}
visitUnion(data) {
return {
'TYPE': [...data.typeIds],
'OFFSET': data.type.mode === UnionMode.Dense ? [...data.valueOffsets] : undefined,
'children': this.visitMany(data.type.children, data.children)
};
}
visitInterval(data) {
return { 'DATA': [...data.values] };
}
visitFixedSizeList(data) {
return {
'children': this.visitMany(data.type.children, data.children)
};
}
visitMap(data) {
return {
'OFFSET': [...data.valueOffsets],
'children': this.visitMany(data.type.children, data.children)
};
}
}
/** @ignore */
function* binaryToString(vector) {
for (const octets of vector) {
yield octets.reduce((str, byte) => {
return `${str}${('0' + (byte & 0xFF).toString(16)).slice(-2)}`;
}, '').toUpperCase();
}
}
/** @ignore */
function* bigNumsToStrings(values, stride) {
const u32s = new Uint32Array(values.buffer);
for (let i = -1, n = u32s.length / stride; ++i < n;) {
yield `${BN.new(u32s.subarray((i + 0) * stride, (i + 1) * stride), false)}`;
}
}
//# sourceMappingURL=jsonvectorassembler.mjs.map
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