Portability Statement still fetches all data in iterator mode

[morozov]

As of #2718, in iterator mode, statements are supposed to fetch entries one by one for more efficient memory usage.

Apparently, the portability statement wrapper still fetches all entries in memory:

dbal/lib/Doctrine/DBAL/Portability/Statement.php

Lines 140 to 145 in 11037b4

	public function getIterator()
	{
	$data = $this->fetchAll();
	return new \ArrayIterator($data);
	}

It renders the entire optimization useless if the portability wrapper is used.

[github-actions]

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