org.apache.pig.piggybank.evaluation.datetime.convert
Class UnixToISO
java.lang.Object
org.apache.pig.EvalFunc<String>
org.apache.pig.piggybank.evaluation.datetime.convert.UnixToISO
public class UnixToISO
- extends EvalFunc<String>
UnixToISO converts Unix Time Long datetimes to ISO8601 datetime strings
Jodatime: http://joda-time.sourceforge.net/
ISO8601 Date Format: http://en.wikipedia.org/wiki/ISO_8601
Unix Time: http://en.wikipedia.org/wiki/Unix_time
Example usage:
REGISTER /Users/me/commiter/piggybank/java/piggybank.jar ;
REGISTER /Users/me/commiter/piggybank/java/lib/joda-time-1.6.jar ;
DEFINE UnixToISO org.apache.pig.piggybank.evaluation.datetime.convert.UnixToISO();
UnixIn = LOAD 'test2.tsv' USING PigStorage('\t') AS (dt:long);
DESCRIBE UnixIn;
UnixIn: {dt: long}
DUMP UnixIn;
(1231290421000L)
(1233885962000L)
(1236222303000L)
toISO = FOREACH UnixIn GENERATE UnixToISO(dt) AS ISOTime:chararray;
DESCRIBE toISO;
toISO: {ISOTime: chararray}
DUMP toISO;
(2009-01-07T01:07:01.000Z)
(2009-02-06T02:06:02.000Z)
(2009-03-05T03:05:03.000Z)
...
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 |
UnixToISO
public UnixToISO()
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
outputSchema
public Schema outputSchema(Schema input)
- Overrides:
outputSchema
in class EvalFunc<String>
- Parameters:
input
- Schema of the input
- Returns:
- Schema of the output
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
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