BatchIteratorInterface.php

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<?php
namespace Magento\Framework\DB\Query;

interface BatchIteratorInterface extends \Iterator
{
    const UNIQUE_FIELD_ITERATOR = "unique";

    const NON_UNIQUE_FIELD_ITERATOR = "non_unqiue";

    public function current();

    public function key();

    public function next();

    public function rewind();

    public function valid();
}