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分层字典

看看下面的层次结构:

这种层次结构可以表示为下面的字典表。

ClickHouse支持 等级 属性为 属性。 此属性允许您配置类似于上述的分层字典。

该 独裁主义 函数允许您获取元素的父链。

<dictionary>
    <structure>
        <id>
            <name>region_id</name>
        </id>
            <name>parent_region</name>
            <type>UInt64</type>
            <null_value>0</null_value>
            <hierarchical>true</hierarchical>
        </attribute>
            <name>region_name</name>
            <type>String</type>
            <null_value></null_value>
        </attribute>
    </structure>