org.apache.pig.piggybank.evaluation.decode
Class Decode
java.lang.Object
org.apache.pig.EvalFunc<String>
org.apache.pig.piggybank.evaluation.decode.Decode
public class Decode
- extends EvalFunc<String>
- Syntax:
String Decode(expression, value1, mapping_string1, ..., valueN, mapping_stringN, other_string)
.
- Logic:
if (expression==value1) return mapping_string1;
......
else if (expression==valueN) return mapping_stringN;
else return other_string;
expression can be any simple types
Methods inherited from class org.apache.pig.EvalFunc |
finish, getArgToFuncMapping, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, isAsynchronous, progress, setPigLogger, setReporter, warn |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Decode
public Decode()
outputSchema
public Schema outputSchema(Schema input)
- Overrides:
outputSchema
in class EvalFunc<String>
- Parameters:
input
- Schema of the input
- Returns:
- Schema of the output
exec
public String exec(Tuple tuple)
throws IOException
- Description copied from class:
EvalFunc
- This callback method must be implemented by all subclasses. This
is the method that will be invoked on every Tuple of a given dataset.
Since the dataset may be divided up in a variety of ways the programmer
should not make assumptions about state that is maintained between
invocations of this method.
- Specified by:
exec
in class EvalFunc<String>
- Parameters:
tuple
- the Tuple to be processed.
- Returns:
- result, of type T.
- Throws:
IOException
Copyright © ${year} The Apache Software Foundation