Order.php

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<?php
namespace Magento\Sales\Model\ResourceModel\Report\Shipping\Collection;

class Order extends \Magento\Sales\Model\ResourceModel\Report\Collection\AbstractCollection
{
    protected $_periodFormat;

    protected $_selectedColumns = [];

    public function __construct(
        \Magento\Framework\Data\Collection\EntityFactory $entityFactory,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Data\Collection\Db\FetchStrategyInterface $fetchStrategy,
        \Magento\Framework\Event\ManagerInterface $eventManager,
        \Magento\Sales\Model\ResourceModel\Report $resource,
        \Magento\Framework\DB\Adapter\AdapterInterface $connection = null
    ) {
        $resource->init('sales_shipping_aggregated_order');
        parent::__construct($entityFactory, $logger, $fetchStrategy, $eventManager, $resource, $connection);
    }

    protected function _getSelectedColumns()
    {
        $connection = $this->getConnection();
        if ('month' == $this->_period) {
            $this->_periodFormat = $connection->getDateFormatSql('period', '%Y-%m');
        } elseif ('year' == $this->_period) {
            $this->_periodFormat = $connection->getDateExtractSql(
                'period',
                \Magento\Framework\DB\Adapter\AdapterInterface::INTERVAL_YEAR
            );
        } else {
            $this->_periodFormat = $connection->getDateFormatSql('period', '%Y-%m-%d');
        }

        if (!$this->isTotals() && !$this->isSubTotals()) {
            $this->_selectedColumns = [
                'period' => $this->_periodFormat,
                'shipping_description' => 'shipping_description',
                'orders_count' => 'SUM(orders_count)',
                'total_shipping' => 'SUM(total_shipping)',
                'total_shipping_actual' => 'SUM(total_shipping_actual)',
            ];
        }

        if ($this->isTotals()) {
            $this->_selectedColumns = $this->getAggregatedColumns();
        }

        if ($this->isSubTotals()) {
            $this->_selectedColumns = $this->getAggregatedColumns() + ['period' => $this->_periodFormat];
        }

        return $this->_selectedColumns;
    }

    protected function _beforeLoad()
    {
        $this->getSelect()->from($this->getResource()->getMainTable(), $this->_getSelectedColumns());

        if (!$this->isTotals() && !$this->isSubTotals()) {
            $this->getSelect()->group([$this->_periodFormat, 'shipping_description']);
        }
        if ($this->isSubTotals()) {
            $this->getSelect()->group([$this->_periodFormat]);
        }
        return parent::_beforeLoad();
    }
}