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public interface UDAFEvaluator
Interface that encapsulates the evaluation logic of a UDAF. One evaluator is needed for every overloaded form of a UDAF .e.g max and min UDAFs would have evaluators for integer, string and other types. On the other hand avg would have an evaluator only for the double type.
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void |
init()
Initializer. |
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void init()
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