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See:
Description
Class Summary | |
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AggregateFunction | An aggregate function is a specific type of group function that takes all records in a group, and outputs only one row. |
ExtendFunction | An extend function takes one row at a time in a group as its input, and produces one row as the output. |
GroupFunction | A group function takes all the records in a group first, and then based on the inputs, produces X number of rows as the output, where X can be zero to many. |
Projectable | Base class for all projection operations. |
SingleInputAggregateFunction | A single input aggregate function is a special type of aggregate function. |
Provides base classes for implementing different kinds of aggregation functions.
See ExtendFunction
or GroupFunction
to implement customized reducer size operations.
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