From 9a5393847390235ea5ce0e18332263b328058686 Mon Sep 17 00:00:00 2001
From: Denis Flaven <denis.flaven@combodo.com>
Date: Wed, 24 Oct 2012 13:09:24 +0000
Subject: [PATCH] Optimization to speed-up the "group-by" tables. (The complete
 solution is implemented in 2.0)

SVN:1.2.1[2337]
---
 application/displayblock.class.inc.php | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/application/displayblock.class.inc.php b/application/displayblock.class.inc.php
index 7817f49bdd..548043d0ec 100644
--- a/application/displayblock.class.inc.php
+++ b/application/displayblock.class.inc.php
@@ -348,7 +348,11 @@ class DisplayBlock
 				$aGroupBy = array();
 				$sLabels = array();
 				$iTotalCount = $this->m_oSet->Count();
-				while($oObj = $this->m_oSet->Fetch())
+				$oTmpSet = clone $this->m_oSet;
+				// Speed up the load, load only the needed field to group on
+				$sAlias = $oTmpSet->GetFilter()->GetClassAlias();
+				$oTmpSet->OptimizeColumnLoad(array($sAlias => array($sGroupByField)));
+				while($oObj = $oTmpSet->Fetch())
 				{
 					if (isset($aExtraParams['group_by_expr']))
 					{