Manual.php

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<?php
namespace Magento\Framework\Search\Dynamic\Algorithm;

use Magento\Framework\Search\Adapter\OptionsInterface;
use Magento\Framework\Search\Dynamic\DataProviderInterface;
use Magento\Framework\Search\Dynamic\EntityStorage;
use Magento\Framework\Search\Request\BucketInterface;

class Manual implements AlgorithmInterface
{
    private $dataProvider;

    private $options;

    public function __construct(DataProviderInterface $dataProvider, OptionsInterface $options)
    {
        $this->dataProvider = $dataProvider;
        $this->options = $options;
    }

    public function getItems(
        BucketInterface $bucket,
        array $dimensions,
        EntityStorage $entityStorage
    ) {
        $range = $this->dataProvider->getRange();
        $options = $this->options->get();
        if (!$range) {
            $range = $options['range_step'];
        }
        $dbRanges = $this->dataProvider->getAggregation($bucket, $dimensions, $range, $entityStorage);
        $dbRanges = $this->processRange($dbRanges, $options['max_intervals_number']);
        $data = $this->dataProvider->prepareData($range, $dbRanges);

        return $data;
    }

    private function processRange($items, $maxIntervalsNumber)
    {
        $i = 0;
        $lastIndex = null;
        foreach ($items as $k => $v) {
            ++$i;
            if ($i > 1 && $i > $maxIntervalsNumber) {
                $items[$lastIndex] += $v;
                unset($items[$k]);
            } else {
                $lastIndex = $k;
            }
        }

        return $items;
    }
}