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.SchemaTypelog, 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, warnpublic 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
EvalFuncexec in class EvalFunc<String>tuple - the Tuple to be processed.IOExceptionCopyright © 2007-2017 The Apache Software Foundation