public interface Joiner extends java.io.Serializable
CoGroup. Joins perform based on the equality of the join keys. In the case of null values, Java treats two null values as equivalent. SQL does not treat null values as equal. To produce SQL like results in a given join, a new
Comparatorwill need to be used on the joined values to prevent null from equaling null. As a convenience, see the
java.util.Iterator<Tuple> getIterator(JoinerClosure closure)
closure- of type GroupClosure
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