frontend/node_modules/apache-arrow/util/recordbatch.mjs

// 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 { Data } from '../data';
import { Schema } from '../schema';
import { Chunked } from '../vector/chunked';
import { RecordBatch } from '../recordbatch';
const noopBuf = new Uint8Array(0);
const nullBufs = (bitmapLength) => [
    noopBuf, noopBuf, new Uint8Array(bitmapLength), noopBuf
];
/** @ignore */
export function ensureSameLengthData(schema, chunks, batchLength = chunks.reduce((l, c) => Math.max(l, c.length), 0)) {
    let data;
    let field;
    let i = -1, n = chunks.length;
    const fields = [...schema.fields];
    const batchData = [];
    const bitmapLength = ((batchLength + 63) & ~63) >> 3;
    while (++i < n) {
        if ((data = chunks[i]) && data.length === batchLength) {
            batchData[i] = data;
        }
        else {
            (field = fields[i]).nullable || (fields[i] = fields[i].clone({ nullable: true }));
            batchData[i] = data ? data._changeLengthAndBackfillNullBitmap(batchLength)
                : Data.new(field.type, 0, batchLength, batchLength, nullBufs(bitmapLength));
        }
    }
    return [new Schema(fields), batchLength, batchData];
}
/** @ignore */
export function distributeColumnsIntoRecordBatches(columns) {
    return distributeVectorsIntoRecordBatches(new Schema(columns.map(({ field }) => field)), columns);
}
/** @ignore */
export function distributeVectorsIntoRecordBatches(schema, vecs) {
    return uniformlyDistributeChunksAcrossRecordBatches(schema, vecs.map((v) => v instanceof Chunked ? v.chunks.map((c) => c.data) : [v.data]));
}
/** @ignore */
function uniformlyDistributeChunksAcrossRecordBatches(schema, columns) {
    const fields = [...schema.fields];
    const batchArgs = [];
    const memo = { numBatches: columns.reduce((n, c) => Math.max(n, c.length), 0) };
    let numBatches = 0, batchLength = 0;
    let i = -1, numColumns = columns.length;
    let child, childData = [];
    while (memo.numBatches-- > 0) {
        for (batchLength = Number.POSITIVE_INFINITY, i = -1; ++i < numColumns;) {
            childData[i] = child = columns[i].shift();
            batchLength = Math.min(batchLength, child ? child.length : batchLength);
        }
        if (isFinite(batchLength)) {
            childData = distributeChildData(fields, batchLength, childData, columns, memo);
            if (batchLength > 0) {
                batchArgs[numBatches++] = [batchLength, childData.slice()];
            }
        }
    }
    return [
        schema = new Schema(fields, schema.metadata),
        batchArgs.map((xs) => new RecordBatch(schema, ...xs))
    ];
}
/** @ignore */
function distributeChildData(fields, batchLength, childData, columns, memo) {
    let data;
    let field;
    let length = 0, i = -1, n = columns.length;
    const bitmapLength = ((batchLength + 63) & ~63) >> 3;
    while (++i < n) {
        if ((data = childData[i]) && ((length = data.length) >= batchLength)) {
            if (length === batchLength) {
                childData[i] = data;
            }
            else {
                childData[i] = data.slice(0, batchLength);
                data = data.slice(batchLength, length - batchLength);
                memo.numBatches = Math.max(memo.numBatches, columns[i].unshift(data));
            }
        }
        else {
            (field = fields[i]).nullable || (fields[i] = field.clone({ nullable: true }));
            childData[i] = data ? data._changeLengthAndBackfillNullBitmap(batchLength)
                : Data.new(field.type, 0, batchLength, batchLength, nullBufs(bitmapLength));
        }
    }
    return childData;
}

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