CallDuration::addCallDurationCompareField

protected function addCallDurationCompareField(Query $query, string $columnName): void
{
	$query->addSelect($columnName . '_COMPARE');
	$query->registerRuntimeField(new ExpressionField(
		$columnName . '_COMPARE',
		'if(%s = 0, null, round((%s - %s) / %s * 100, 1))',
		[$columnName, $columnName, 'previous.' . $columnName, 'previous.' . $columnName]
	));
}