GetSelectColumns - how to set field aliases

OK, after "grep"ing thru the core folder for any clues the getnodes.processor.php gave me a hint.

$c->select(array(
$modx->getSelectColumns('objectName','objectName','',array('field_name')).' AS `alias_name`'
));

This works, but is there any smoother way to do this inside the getSelectColumns function? Probably from inside array() but I have no idea how

Sumoborac

$c->select(
    array(
        'alias_name' => "{$modx->escape('objectAlias')}.{$modx->escape('field_name')}"
    )
);

An alternate approach without getSelectColumns()...

$c->select(
    array(
        'alias_name' => "{$modx->escape('objectAlias')}.{$modx->escape('field_name')}"
    )
);

What do you mean by smoother way?

$c->getSelectColumns('objectName','objectAlias','',array('fieldName:AS'=>'fieldAlias'));