Codeigniter profiler, where are the queries coming from ?

database_DB_driver.php

<?php
// from http://php.net/manual/en/function.debug-backtrace.php#111255
// adapted for codeigniter

// database/DB_driver.php method query()
//...
// Save the  query for debugging
if ($this->save_queries == TRUE)
{
	$this->queries[] = $sql . "\n# ".get_caller_info();
}

// get_caller_info funtion somewhere in global scope
function get_caller_info() {
    $c = '';
    $file = '';
    $line = '';
    $func = '';
    $class = '';
    $trace = debug_backtrace();
    // if (isset($trace[2])) {
    //     $file = $trace[1]['file'];
    //     $line = $trace[1]['line'];
    //     $func = $trace[2]['function'];
    //     if ((substr($func, 0, 7) == 'include') || (substr($func, 0, 7) == 'require')) {
    //         $func = '';
    //     }
    // } else if (isset($trace[1])) {
    //     $file = $trace[1]['file'];
    //     $line = $trace[1]['line'];
    //     $func = '';
    // }
    if (isset($trace[3]['class'])) {
        $class = $trace[3]['class'];
        $func = $trace[3]['function'];
        $file = $trace[2]['file'];
        $line = $trace[2]['line'];
    } else if (isset($trace[2]['class'])) {
        $class = $trace[2]['class'];
        $func = $trace[2]['function'];
        $file = $trace[1]['file'];
        $line = $trace[1]['line'];
    }
    if ($file != ''){
    	if (strpos($file,BASEPATH)===0) {
    		$file = 'CI ' . str_replace(BASEPATH,'',$file);
    	}elseif (strpos($file,APPPATH)===0) {
    		$file = 'APP ' . str_replace(APPPATH,'',$file);
    	}else {
    		$file = 'UNKNOWN ' . basename($file);
    	}
    } 
    $c = $file . ": ";
    $c .= ($class != '') ? ":" . $class . "->" : "";
    $c .= ($func != '') ? $func . "(): " : "";
    $c .= ' Line: '.$line;
    return($c);
}