protected static function construct_calculation_sql($class_name, $column_name, $operation, &$options)
{
$columns = self::$connection->columns(self::get_table_name($class_name));
if (isset($columns[$column_name])) {
$column_name = self::quoted_table_name($class_name) . '.' . $column_name;
}
$sql = 'SELECT ' . $operation . '(' . (isset($options['distinct']) ? 'DISTINCT ' : '') . $column_name . ') ' . 'FROM ' . (isset($options['from']) ? $options['from'] : self::quoted_table_name($class_name));
SqlBuilder::add_sql_trail($sql, $options);
return $sql;
}
