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I have a good solution that you can copy/paste your query string directly in "SQL" section in Phpmyadmin and debug your query ( I often use this method when I struggle with query)

$querystring=$query->__toString();
$querystring=str_replace("{",'',$querystring);
$querystring=str_replace("}",'',$querystring);
foreach($query->getArguments() as $key=> $item){

    if(!$item) {
        $item = 'NULL';
    }
    $querystring=str_replace($key.')',$item.')',$querystring);
}
dpm($querystring);

I hope this be usful for other guys.