File "WithCustomQuerySize.php"
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<?php
namespace Maatwebsite\Excel\Concerns;
interface WithCustomQuerySize
{
/**
* Queued exportables are processed in chunks; each chunk being a job pushed to the queue by the QueuedWriter.
* In case of exportables that implement the FromQuery concern, the number of jobs is calculated by dividing the $query->count() by the chunk size.
* Depending on the implementation of the query() method (eg. When using a groupBy clause), this calculation might not be correct.
*
* When this is the case, you should use this method to provide a custom calculation of the query size.
*
* @return int
*/
public function querySize(): int;
}