public class Decode extends EvalFunc<String>
String Decode(expression, value1, mapping_string1, ..., valueN, mapping_stringN, other_string)
.if (expression==value1) return mapping_string1;
......
else if (expression==valueN) return mapping_stringN;
else return other_string;
EvalFunc.SchemaType
log, pigLogger, reporter, returnType
Constructor and Description |
---|
Decode() |
Modifier and Type | Method and Description |
---|---|
String |
exec(Tuple tuple)
This callback method must be implemented by all subclasses.
|
Schema |
outputSchema(Schema input)
Report the schema of the output of this UDF.
|
allowCompileTimeCalculation, finish, getArgToFuncMapping, getCacheFiles, getInputSchema, getLoadCaster, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, needEndOfAllInputProcessing, progress, setEndOfAllInput, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn
public Schema outputSchema(Schema input)
EvalFunc
The default implementation interprets the OutputSchema
annotation,
if one is present. Otherwise, it returns null
(no known output schema).
outputSchema
in class EvalFunc<String>
input
- Schema of the inputpublic String exec(Tuple tuple) throws IOException
EvalFunc
exec
in class EvalFunc<String>
tuple
- the Tuple to be processed.IOException
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