Description:
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When an invalid column number is provided to PDOStatement::fetchColumn(), MySQL, PostgreSQL and SQLite drivers return NULL without triggering a warning.

Unlike the above, the Oracle driver triggers a misleading warning: column %d data was too large for buffer and was truncated to fit it.

Test script:
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$conn = new PDO('oci:dbname=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SID=XE)))', 'system', 'oracle');

// incorrect column, positional parameter
$stmt = $conn->prepare('SELECT ? FROM DUAL');
$stmt->execute([1]);
$value = $stmt->fetchColumn(1);
var_dump($value);

Expected result:
----------------
NULL

Actual result:
--------------
NULL

Warning: PDOStatement::fetchColumn(): column 1 data was too large for buffer and was truncated to fit it in test.php on line 20

Call Stack:
    0.0001     365728   1. {main}() test.php:0
    0.0189     372584   2. PDOStatement->fetchColumn() test.php:20