Merge branch 'develop-olympus' into develop

By Andreas Fischer
via Andreas Fischer (1) and Nils Adermann (1)
* develop-olympus:
  [ticket/10751] Use sql_lower_text() in view_log(). log_data is a text column.
  [ticket/10751] Add sql_lower_text() to database abstraction layer.

Conflicts:
	phpBB/includes/db/dbal.php

phpBB/includes/db/mssql.php

@@ -324,6 +324,14 @@ class dbal_mssql extends dbal
 		return str_replace(array("'", "\0"), array("''", ''), $msg);
 	}
 
+	/**
+	* {@inheritDoc}
+	*/
+	function sql_lower_text($column_name)
+	{
+		return "LOWER(SUBSTRING($column_name, 1, DATALENGTH($column_name)))";
+	}
+
 	/**
 	* Build LIKE expression
 	* @access private