protected static function dynColSqlMaria(array $attrs, & $params)
    {
        $sql = [];
        foreach ($attrs as $key => $value) {
            if (is_object($value) && !($value instanceof ValueExpression)) {
                $value = method_exists($value, 'toArray') ? $value->toArray() : (array) $value;
            }
            if ($value === [] || $value === null) {
                continue;
            }

            $phKey = static::placeholder();
            $phValue = static::placeholder();
            $sql[] = $phKey;
            $params[$phKey] = $key;

            if ($value instanceof ValueExpression || is_float($value)) {
                $sql[] = $value;
            } elseif (is_scalar($value)) {
                $sql[] = $phValue;
                $params[$phValue] = $value;
            } elseif (is_array($value)) {
                $sql[] = static::dynColSqlMaria($value, $params);
            }
        }

        return $sql === [] ? 'null' : 'COLUMN_CREATE(' . implode(',', $sql) . ')';
    }