org.apache.pig.piggybank.evaluation.string
Class RegexExtract
java.lang.Object
org.apache.pig.EvalFunc<String>
org.apache.pig.piggybank.evaluation.string.RegexExtract
public class RegexExtract
- extends EvalFunc<String>
- Syntax:
String RegexExtract(String expression, String regex, int match_index)
.
- Input:
expression
-source string
.
regex
-regular expression
.
match_index
-index of the group to extract
.
- Output:
extracted group, if fail, return null
.
Methods inherited from class org.apache.pig.EvalFunc |
finish, 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 |
RegexExtract
public RegexExtract()
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 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<String>
- Parameters:
input
- the Tuple to be processed.
- Returns:
- result, of type T.
- Throws:
IOException
getArgToFuncMapping
public List<FuncSpec> getArgToFuncMapping()
throws FrontendException
- Overrides:
getArgToFuncMapping
in class EvalFunc<String>
- Returns:
- A List containing FuncSpec objects representing the Function class
which can handle the inputs corresponding to the schema in the objects
- Throws:
FrontendException
Copyright © ${year} The Apache Software Foundation