Examples of cascading.operation.buffer.FirstNBuffer

cascading.operation.buffer.FirstNBuffer

Class FirstNBuffer will return the first N tuples seen in a given grouping. After the tuples are returned the Buffer stops iterating the arguments unlike the {@link cascading.operation.aggregator.First}{@link cascading.operation.Aggregator} which by contract sees all the values in the grouping.

By default it returns one Tuple.

Order can be controlled through the prior {@link cascading.pipe.GroupBy} or {@link cascading.pipe.CoGroup}pipes.

This class is used by {@link cascading.pipe.assembly.Unique}.


    for( int i = 0; i < filters.length; i++ )
      filters[ i ] = new Each( pipes[ i ], uniqueFields, partialDuplicates );


    Pipe pipe = new GroupBy( name, filters, uniqueFields );
    pipe = new Every( pipe, Fields.ALL, new FirstNBuffer(), Fields.RESULTS );


    setTails( pipe );
    }

Examples of cascading.operation.buffer.FirstNBuffer

Related Classes of cascading.operation.buffer.FirstNBuffer