Index: t3lib/config_default.php
===================================================================
--- t3lib/config_default.php	(revision 7619)
+++ t3lib/config_default.php	(working copy)
@@ -68,6 +68,7 @@
 		'recursiveDomainSearch' => FALSE,		// Boolean. If set, the search for domain records will be done recursively by stripping parts of the host name off until a matching domain record is found.
 		'devIPmask' => '127.0.0.1,::1',			// Defines a list of IP addresses which will allow development-output to display. The debug() function will use this as a filter. See the function t3lib_div::cmpIP() for details on syntax. Setting this to blank value will deny all. Setting to "*" will allow all.
 		'sqlDebug' => FALSE,					// Boolean. If set, then database queries that fails are outputted in browser. For development.
+		'sqlExplainOutput' => FALSE,			// Boolean. If set, then database queries with results are explained in BE console. Be careful, it slows down the performance, use only for develop!
 		'enable_DLOG' => FALSE,					// Whether the developer log is enabled. See constant "TYPO3_DLOG"
 		'ddmmyy' => 'd-m-y',					// Format of Date-Month-Year - see PHP-function date()
 		'hhmm' => 'H:i',						// Format of Hours-Minutes - see PHP-function date()
Index: typo3/init.php
===================================================================
--- typo3/init.php	(revision 7619)
+++ typo3/init.php	(working copy)
@@ -88,7 +88,7 @@
 
 
 // *******************************
-// Fix BACK_PATH, if the TYPO3_mainDir is set to something else than 
+// Fix BACK_PATH, if the TYPO3_mainDir is set to something else than
 // typo3/, this is a workaround because the conf.php of the old modules
 // still have "typo3/" hardcoded. Can be removed once we don't have to worry about
 // legacy modules (with conf.php and $BACK_PATH) anymore. See RFC / Bug #13262 for more details.
@@ -213,6 +213,7 @@
 /** @var TYPO3_DB t3lib_db */
 $TYPO3_DB = t3lib_div::makeInstance('t3lib_DB');
 $TYPO3_DB->debugOutput = $TYPO3_CONF_VARS['SYS']['sqlDebug'];
+$TYPO3_DB->explainOutput = $TYPO3_CONF_VARS['SYS']['sqlExplainOutput'];
 
 $CLIENT = t3lib_div::clientInfo();					// $CLIENT includes information about the browser/user-agent
 $PARSETIME_START = t3lib_div::milliseconds();		// Is set to the system time in milliseconds. This could be used to output script parsetime in the end of the script