From cbe32e2f630683cc4749a9eb59745aa59e03eac8 Mon Sep 17 00:00:00 2001
From: Coleman Watts <coleman@civicrm.org>
Date: Fri, 24 Oct 2014 08:44:56 -0400
Subject: [PATCH] CRM-15107 - Fix slow group_contact count query on large dbs

---
 CRM/Contact/BAO/Group.php | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/CRM/Contact/BAO/Group.php b/CRM/Contact/BAO/Group.php
index 75332c0c9f..8743a3131e 100644
--- a/CRM/Contact/BAO/Group.php
+++ b/CRM/Contact/BAO/Group.php
@@ -831,12 +831,8 @@ class CRM_Contact_BAO_Group extends CRM_Contact_DAO_Group {
     }
 
     $query = "
-        SELECT groups.*, createdBy.sort_name as created_by, IF(groups.saved_search_id, COUNT(smart_contacts.id), COUNT(contacts.id)) as `count` {$select}
+        SELECT groups.*, createdBy.sort_name as created_by {$select}
         FROM  civicrm_group groups
-        LEFT JOIN civicrm_group_contact contacts
-          ON contacts.group_id = groups.id AND contacts.status = 'Added'
-        LEFT JOIN civicrm_group_contact_cache smart_contacts
-          ON smart_contacts.group_id = groups.id
         LEFT JOIN civicrm_contact createdBy
           ON createdBy.id = groups.created_id
         {$from}
@@ -861,7 +857,7 @@ class CRM_Contact_BAO_Group extends CRM_Contact_DAO_Group {
     $links = self::actionLinks();
 
     $allTypes = CRM_Core_OptionGroup::values('group_type');
-    $values = array();
+    $values = $groupsToCount = array();
 
     $visibility = CRM_Core_SelectValues::ufVisibility();
 
@@ -873,7 +869,10 @@ class CRM_Contact_BAO_Group extends CRM_Contact_DAO_Group {
 
       if ($permission) {
         $newLinks = $links;
-        $values[$object->id] = array('class' => array());
+        $values[$object->id] = array(
+          'class' => array(),
+          'count' => '0',
+        );
         CRM_Core_DAO::storeValues($object, $values[$object->id]);
         if ($object->saved_search_id) {
           $values[$object->id]['title'] .= ' (' . ts('Smart Group') . ')';
@@ -917,7 +916,7 @@ class CRM_Contact_BAO_Group extends CRM_Contact_DAO_Group {
 
         $values[$object->id]['visibility'] = $visibility[$values[$object->id]['visibility']];
 
-        $values[$object->id]['count'] = $object->count;
+        $groupsToCount[$object->saved_search_id ? 'civicrm_group_contact_cache' : 'civicrm_group_contact'][] = $object->id;
 
         if (isset($values[$object->id]['group_type'])) {
           $groupTypes = explode(CRM_Core_DAO::VALUE_SEPARATOR,
@@ -973,6 +972,14 @@ class CRM_Contact_BAO_Group extends CRM_Contact_DAO_Group {
       }
     }
 
+    // Get group counts
+    foreach ($groupsToCount as $table => $groups) {
+      $dao = CRM_Core_DAO::executeQuery("SELECT group_id, COUNT(id) as `count` FROM $table WHERE group_id IN (" . implode(',', $groups) . ") GROUP BY group_id");
+      while($dao->fetch()) {
+        $values[$dao->group_id]['count'] = $dao->count;
+      }
+    }
+
     return $values;
   }
 
-- 
2.25.1