Description:
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I'm doing a simple count query against catalogued DB2 database through PDO. By default PDO::FETCH_BOTH mode is used and I expect to see result in 0 index of the fetched row, but it appears in indexes 1 and 2. Same occurs with queries like "SELECT 1+1 FROM arcticles". This only occurs on DB2 through PDO, and doesn't occur on MySQL through PDO, DB2 through ibm_db2 or DB2 through ODBC. So I consider this to be  a bug in PDO.

Reproduce code:
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$conn = new PDO('odbc:CATNAME', 'user', 'pass');
$sql = 'SELECT COUNT(*) FROM articles';
foreach ($conn->query($sql) as $row) {
	var_dump($row);
}

Expected result:
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array(2) { [0]=>  string(1) "7"}

or maybe

array(2) { ["COUNT(*)"]=>  string(1) "7" [0]=>  string(1) "7"}

like in MySQL through PDO

Actual result:
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array(2) { [1]=>  string(1) "7" [2]=>  string(1) "7" }