IdoQuery: Allow check if a column is case insensitive compared

refs #9029

modules/monitoring/library/Monitoring/Backend/Ido/Query/IdoQuery.php

@@ -553,6 +553,31 @@ abstract class IdoQuery extends DbQuery
         return stripos($mapped, 'UNIX_TIMESTAMP') !== false;
     }
 
+    /**
+     * Return whether the given alias or column name provides case insensitive value comparison
+     *
+     * @param   string  $aliasOrColumn
+     *
+     * @return  bool
+     */
+    public function isCaseInsensitive($aliasOrColumn)
+    {
+        if ($this->isCustomVar($aliasOrColumn)) {
+            return false;
+        }
+
+        $column = $this->getMappedField($aliasOrColumn) ?: $aliasOrColumn;
+        if (! $column) {
+            return false;
+        }
+
+        if (! empty($this->columnsWithoutCollation)) {
+            return in_array($column, $this->columnsWithoutCollation) || strpos($column, 'LOWER') !== 0;
+        }
+
+        return preg_match('/ COLLATE .+$/', $column) === 1;
+    }
+
     /**
      * Apply oracle specific query initialization
      */