public class UniqueWithDuplicateNullsExternalSortFactoryextends ExternalSortFactory
Method factory to support sorting of Almost unique index. This class
overrides getMergeSort of ExternalSortFactory to return UniqueWithDuplicateNullsMergeSort.
Return the primary implementation type for this access method.
Although an access method may implement more than one implementation
type, this is the expected one. The access manager will put the
primary implementation type in a hash table for fast access.