org.apache.pig.piggybank.evaluation.string
Class LookupInFiles
java.lang.Object
org.apache.pig.EvalFunc<Integer>
org.apache.pig.piggybank.evaluation.string.LookupInFiles
public class LookupInFiles
- extends EvalFunc<Integer>
- Syntax:
int lookupInFiles(String expression,... )
.
- Input:
files are text files on DFS
.
- Output:
if any file contains expression, return 1, otherwise, 0
.
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 |
LookupInFiles
public LookupInFiles()
outputSchema
public Schema outputSchema(Schema input)
- Overrides:
outputSchema
in class EvalFunc<Integer>
- Parameters:
input
- Schema of the input
- Returns:
- Schema of the output
init
public void init(Tuple tuple)
throws IOException
- Throws:
IOException
exec
public Integer exec(Tuple input)
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<Integer>
- Parameters:
input
- the Tuple to be processed.
- Returns:
- result, of type T.
- Throws:
IOException
Copyright © ${year} The Apache Software Foundation