public class GenericUDAFnGrams extends Object implements GenericUDAFResolver
Modifier and Type | Class and Description |
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static class |
GenericUDAFnGrams.GenericUDAFnGramEvaluator
A constant-space heuristic to estimate the top-k n-grams.
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Constructor and Description |
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GenericUDAFnGrams() |
Modifier and Type | Method and Description |
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GenericUDAFEvaluator |
getEvaluator(TypeInfo[] parameters)
Get the evaluator for the parameter types.
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public GenericUDAFEvaluator getEvaluator(TypeInfo[] parameters) throws SemanticException
GenericUDAFResolver
If the class of the object does not implement Serializable, then we will create a new instance of the class at execution time.
getEvaluator
in interface GenericUDAFResolver
parameters
- The types of the parameters. We need the type information to know
which evaluator class to use.SemanticException
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