[
https://issues.apache.org/jira/browse/PIG-1387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13079676#comment-13079676
]
Thejas M Nair commented on PIG-1387:
------------------------------------
The approach looks fine. But I think this should be a type of expr and and not
flatten_generated_item, so that it can be used anywhere, including as argument
to other udfs.
In case of TOTUPLE, the single element case will cause ambiguity, I think that
should not be considered a TOTUPLE call. ie, (20) should be considered the same
as 20.
> Syntactical Sugar for PIG-1385
> ------------------------------
>
> Key: PIG-1387
> URL: https://issues.apache.org/jira/browse/PIG-1387
> Project: Pig
> Issue Type: Wish
> Components: grunt
> Affects Versions: 0.6.0
> Reporter: hc busy
> Labels: gsoc2011
> Fix For: 0.10
>
> Attachments: PIG-1387.1.patch
>
>
> From this conversation, extend PIG-1385 to instead of calling UDF use
> built-in behavior when the (),{},[] groupings are encountered.
> > > What about making them part of the language using symbols?
> > >
> > > instead of
> > >
> > > foreach T generate Tuple($0, $1, $2), Bag($3, $4, $5), $6, $7;
> > >
> > > have language support
> > >
> > > foreach T generate ($0, $1, $2), {$3, $4, $5}, $6, $7;
> > >
> > > or even:
> > >
> > > foreach T generate ($0, $1, $2), {$3, $4, $5}, [$6#$7, $8#$9], $10, $11;
> > >
> > >
> > > Is there reason not to do the second or third other than being more
> > > complicated?
> > >
> > > Certainly I'd volunteer to put the top implementation in to the util
> > > package and submit them for builtin's, but the latter syntactic candies
> > > seems more natural..
> > >
> > >
> > >
> > > On Tue, Apr 20, 2010 at 5:24 PM, Alan Gates <ga...@yahoo-inc.com> wrote:
> > >
> > >> The grouping package in piggybank is left over from back when Pig
> > allowed
> > >> users to define grouping functions (0.1). Functions like these should
> > go in
> > >> evaluation.util.
> > >>
> > >> However, I'd consider putting these in builtin (in main Pig) instead.
> > >> These are things everyone asks for and they seem like a reasonable
> > addition
> > >> to the core engine. This will be more of a burden to write (as we'll
> > hold
> > >> them to a higher standard) but of more use to people as well.
> > >>
> > >> Alan.
> > >>
> > >>
> > >> On Apr 19, 2010, at 12:53 PM, hc busy wrote:
> > >>
> > >> Some times I wonder... I mean, somebody went to the trouble of making a
> > >>> path
> > >>> called
> > >>>
> > >>> org.apache.pig.piggybank.grouping
> > >>>
> > >>> (where it seems like this code belong), but didn't check in any java
> > code
> > >>> into that package.
> > >>>
> > >>>
> > >>> Any comment about where to put this kind of utility classes?
> > >>>
> > >>>
> > >>>
> > >>> On Mon, Apr 19, 2010 at 12:07 PM, Andrey S <oct...@gmail.com> wrote:
> > >>>
> > >>> 2010/4/19 hc busy <hc.b...@gmail.com>
> > >>>>
> > >>>> That's just the way it is right now, you can't make bags or tuples
> > >>>>> directly... Maybe we should have some UDF's in piggybank for these:
> > >>>>>
> > >>>>> toBag()
> > >>>>> toTuple(); --which is kinda like exec(Tuple in){return in;}
> > >>>>> TupleToBag(); --some times you need it this way for some reason.
> > >>>>>
> > >>>>>
> > >>>>> Ok. I place my current code here, may be later I make a patch (if
> > such
> > >>>> implementation is acceptable of course).
> > >>>>
> > >>>> import org.apache.pig.EvalFunc;
> > >>>> import org.apache.pig.data.BagFactory;
> > >>>> import org.apache.pig.data.DataBag;
> > >>>> import org.apache.pig.data.Tuple;
> > >>>> import org.apache.pig.data.TupleFactory;
> > >>>>
> > >>>> import java.io.IOException;
> > >>>>
> > >>>> /**
> > >>>> * Convert any sequence of fields to bag with specified count of
> > >>>> fields<br>
> > >>>> * Schema: count:int, fld1 [, fld2, fld3, fld4... ].
> > >>>> * Output: count=2, then { (fld1, fld2) , (fld3, fld4) ... }
> > >>>> *
> > >>>> * @author astepachev
> > >>>> */
> > >>>> public class ToBag extends EvalFunc<DataBag> {
> > >>>> public BagFactory bagFactory;
> > >>>> public TupleFactory tupleFactory;
> > >>>>
> > >>>> public ToBag() {
> > >>>> bagFactory = BagFactory.getInstance();
> > >>>> tupleFactory = TupleFactory.getInstance();
> > >>>> }
> > >>>>
> > >>>> @Override
> > >>>> public DataBag exec(Tuple input) throws IOException {
> > >>>> if (input.isNull())
> > >>>> return null;
> > >>>> final DataBag bag = bagFactory.newDefaultBag();
> > >>>> final Integer couter = (Integer) input.get(0);
> > >>>> if (couter == null)
> > >>>> return null;
> > >>>> Tuple tuple = tupleFactory.newTuple();
> > >>>> for (int i = 0; i < input.size() - 1; i++) {
> > >>>> if (i % couter == 0) {
> > >>>> tuple = tupleFactory.newTuple();
> > >>>> bag.add(tuple);
> > >>>> }
> > >>>> tuple.append(input.get(i + 1));
> > >>>> }
> > >>>> return bag;
> > >>>> }
> > >>>> }
> > >>>>
> > >>>> import org.apache.pig.ExecType;
> > >>>> import org.apache.pig.PigServer;
> > >>>> import org.junit.Before;
> > >>>> import org.junit.Test;
> > >>>>
> > >>>> import java.io.IOException;
> > >>>> import java.net.URISyntaxException;
> > >>>> import java.net.URL;
> > >>>>
> > >>>> import static org.junit.Assert.assertTrue;
> > >>>>
> > >>>> /**
> > >>>> * @author astepachev
> > >>>> */
> > >>>> public class ToBagTest {
> > >>>> PigServer pigServer;
> > >>>> URL inputTxt;
> > >>>>
> > >>>> @Before
> > >>>> public void init() throws IOException, URISyntaxException {
> > >>>> pigServer = new PigServer(ExecType.LOCAL);
> > >>>> inputTxt =
> > >>>> this.getClass().getResource("bagTest.txt").toURI().toURL();
> > >>>> }
> > >>>>
> > >>>> @Test
> > >>>> public void testSimple() throws IOException {
> > >>>> pigServer.registerQuery("a = load '" + inputTxt.toExternalForm()
> > +
> > >>>> "' using PigStorage(',') " +
> > >>>> "as (id:int, a:chararray, b:chararray, c:chararray,
> > >>>> d:chararray);");
> > >>>> pigServer.registerQuery("last = foreach a generate flatten(" +
> > >>>> ToBag.class.getName() + "(2, id, a, id, b, id, c));");
> > >>>>
> > >>>> pigServer.deleteFile("target/pigtest/func1.txt");
> > >>>> pigServer.store("last", "target/pigtest/func1.txt");
> > >>>> assertTrue(pigServer.fileSize("target/pigtest/func1.txt") > 0);
> > >>>> }
> > >>>> }
> > >>>>
> > >>>>
> > >>
> > >
> >
> This is a candidate project for Google summer of code 2011. More information
> about the program can be found at http://wiki.apache.org/pig/GSoc2011
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
