```
public class ClusterKeySpec
extends Object
```
Description of one clustering key (column) for a datasource. Clustering is the process of physically sorting data by a sort key. This class represents one column of that sort key. The key consists of a name and a sort direction. Sort direction is optional: omitted, ascending is assumed. (In Druid, clustering is always NULLS LOW in SQL terms, so that attribute does not appear here.)

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

public static final com.fasterxml.jackson.core.type.TypeReference<List<ClusterKeySpec>> CLUSTER_KEY_LIST_TYPE_REF

public ClusterKeySpec(String expr,
                      @Nullable
                      Boolean desc)

Class ClusterKeySpec