diff --git a/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php b/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
index 5c0cbba82..91b8e4ca0 100644
--- a/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
+++ b/modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php
@@ -485,22 +485,16 @@ abstract class IdoQuery extends DbQuery
             if ($filter->getExpression() === '*') {
                 return; // Wildcard only filters are ignored so stop early here to avoid joining a table for nothing
             }
+
             $alias = $filter->getColumn();
             $this->requireColumn($alias);
+
             if ($this->isCustomvar($alias)) {
                 $column = $this->getCustomvarColumnName($alias);
             } else {
                 $column = $this->aliasToColumnName($alias);
             }
-            if (isset($this->columnsWithoutCollation[$alias])) {
-                $expression = $filter->getExpression();
-                if (is_array($expression)) {
-                    $filter->setExpression(array_map('strtolower', $expression));
-                } else {
-                    $filter->setExpression(strtolower($expression));
 
-                }
-            }
             $filter->setColumn($column);
         } else {
             foreach ($filter->filters() as $filter) {
@@ -519,11 +513,48 @@ abstract class IdoQuery extends DbQuery
         return parent::addFilter($filter);
     }
 
+    /**
+     * Recurse the given filter and ensure that any string conversion is case-insensitive
+     *
+     * @param Filter $filter
+     */
+    protected function lowerColumnsWithoutCollation(Filter $filter)
+    {
+        if ($filter instanceof FilterExpression) {
+            if (
+                in_array($filter->getColumn(), $this->columnsWithoutCollation)
+                && strpos($filter->getColumn(), 'LOWER') !== 0
+            ) {
+                $filter->setColumn('LOWER(' . $filter->getColumn() . ')');
+                $expression = $filter->getExpression();
+                if (is_array($expression)) {
+                    $filter->setExpression(array_map('strtolower', $expression));
+                } else {
+                    $filter->setExpression(strtolower($expression));
+                }
+            }
+        } else {
+            foreach ($filter->filters() as $chainedFilter) {
+                $this->lowerColumnsWithoutCollation($chainedFilter);
+            }
+        }
+    }
+
+    protected function applyFilterSql($select)
+    {
+        if (! empty($this->columnsWithoutCollation)) {
+            $this->lowerColumnsWithoutCollation($this->filter);
+        }
+
+        parent::applyFilterSql($select);
+    }
+
     public function where($condition, $value = null)
     {
         if ($value === '*') {
             return $this; // Wildcard only filters are ignored so stop early here to avoid joining a table for nothing
         }
+
         $this->requireColumn($condition);
         $col = $this->getMappedField($condition);
         if ($col === null) {
@@ -571,6 +602,7 @@ abstract class IdoQuery extends DbQuery
         if (! empty($this->columnsWithoutCollation)) {
             return in_array($column, $this->columnsWithoutCollation) || strpos($column, 'LOWER') !== 0;
         }
+
         return preg_match('/ COLLATE .+$/', $column) === 1;
     }
 
@@ -601,11 +633,11 @@ abstract class IdoQuery extends DbQuery
     {
         $this->customVarsJoinTemplate =
             '%1$s = %2$s.object_id AND LOWER(%2$s.varname) = %3$s';
-        foreach ($this->columnMap as $table => &$columns) {
-            foreach ($columns as $alias => &$column) {
-                if (false !== $pos = strpos($column, ' COLLATE')) {
-                    $column = 'LOWER(' . substr($column, 0, $pos) . ')';
-                    $this->columnsWithoutCollation[$alias] = true;
+        foreach ($this->columnMap as $table => & $columns) {
+            foreach ($columns as $alias => & $column) {
+                $column = preg_replace('/ COLLATE .+$/', '', $column, -1, $count);
+                if ($count > 0) {
+                    $this->columnsWithoutCollation[] = $this->getMappedField($alias);
                 }
                 $column = preg_replace(
                     '/inet_aton\(([[:word:].]+)\)/i',