ClickHouse/src/Common/SettingConstraintWritability.h

#pragma once


namespace DB
{

enum class SettingConstraintWritability
{
    // Default. Setting can be change within specified range only in `readonly=0` or `readonly=2` mode.
    WRITABLE,

    // Setting cannot be changed at all.
    // Either READONLY or CONST keyword in SQL syntax can be used (<readonly/> or <const/> in config.xml) to enable this.
    // NOTE: name `CONST` is chosen to avoid confusion with `readonly` setting.
    CONST,

    // Setting can be changed within specified range, regardless of `readonly` setting value.
    CHANGEABLE_IN_READONLY,

    MAX
};

}