public interface Hasher<V>
Comparatorimplementation to also be delegated to during hashCode generation during grouping partitioning. If a Comparator is used to compare two types during grouping, its likely the
hashCodevalue between the two objects will not be consistent. This allows to objects being equal to hash to the same bucket (reducer) during partitioning. As of Cascading 3.0 null values will be passed to implementations of the Hasher interface.
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