系统。merge_tree_settings 

包含有关以下设置的信息 MergeTree 桌子

列:

• name (String) — Setting name.
• value (String) — Setting value.
• description (String) — Setting description.
• type (String) — Setting type (implementation specific string value).
• changed (UInt8) — Whether the setting was explicitly defined in the config or explicitly changed.