@WindowFunctionDescription(supportsWindow=true, pivotResult=false, impliesOrder=true, supportsNullTreatment=true) public class GenericUDAFFirstValue extends AbstractGenericUDAFResolver
Modifier and Type | Class and Description |
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static class |
GenericUDAFFirstValue.GenericUDAFFirstValueEvaluator |
Constructor and Description |
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GenericUDAFFirstValue() |
Modifier and Type | Method and Description |
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protected GenericUDAFFirstValue.GenericUDAFFirstValueEvaluator |
createEvaluator(boolean skipNulls) |
GenericUDAFEvaluator |
getEvaluator(GenericUDAFParameterInfo info)
Get the evaluator for the parameter types.
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getEvaluator
public GenericUDAFEvaluator getEvaluator(GenericUDAFParameterInfo info) throws SemanticException
GenericUDAFResolver2
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 GenericUDAFResolver2
getEvaluator
in class AbstractGenericUDAFResolver
info
- The parameter information that is applicable to the UDAF being
invoked.SemanticException
protected GenericUDAFFirstValue.GenericUDAFFirstValueEvaluator createEvaluator(boolean skipNulls)
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