Hi Nicolas,

Here is advanced solution: Create your own process

class MyReport extends \koolreport\KoolReport
{
    ...
    function setup()
    {
        ...
        ->pipe(new MyProcess())
        ...
    }
}

class MyProcess extends \koolreport\core\Process
{
    function onInput($row)
    {
        // Here is where the MyProcess receives data row by row.
        // You can pipe data from here to next process by next() function
        $this->next($row);
    }
}

In the onInput() function, each time you call $this->next(), a row of data will be sent to the next process. So basically you can do whatever you want here with data. For example, you save the previous row and later check if the time of current row has step difference from the time of previous row. if the time of previous row is "2:00" but the current row is "5:00", you need to use next() function to send 2 fake rows with time = "3:00" and "4:00" before sending real row of time ="5:00".

Please let me know if you need further assistance.