Examples of org.apache.pig.data.DefaultDataBag$DefaultDataBagIterator

org.apache.pig.data.DefaultDataBag
An iterator that handles getting the next tuple from the bag. This iterator has a couple of issues to deal with. First, data can be stored in a combination of in memory and on disk. Second, the bag may be asked to spill while the iterator is reading it. This means that it will be pointing to someplace in memory and suddenly it will need to switch to a disk file.


    public static class JiraPig1030 extends EvalFunc<DataBag> {


        @Override
        public DataBag exec(Tuple input) throws IOException {
            return new DefaultDataBag();
        }

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        Tuple tuple = TupleFactory.getInstance().newTuple(2);
            ArrayList<Tuple> columns = new ArrayList<Tuple>();
            tuple.set(0, new DataByteArray(key));
            for (Map.Entry<byte[], IColumn> entry : cf.entrySet())
                columns.add(columnToTuple(entry.getKey(), entry.getValue()));
            tuple.set(1, new DefaultDataBag(columns));
            return tuple;
        }
        catch (InterruptedException e)
        {
            throw new IOException(e.getMessage());

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        // super
        ArrayList<Tuple> subcols = new ArrayList<Tuple>();
        for (IColumn subcol : ((SuperColumn)col).getSubColumns())
            subcols.add(columnToTuple(subcol.name(), subcol));
        pair.set(1, new DefaultDataBag(subcols));
        return pair;
    }

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    if (list == null) {
      return null;
    }


    HCatFieldSchema elementSubFieldSchema = hfs.getArrayElementSchema().getFields().get(0);
    DataBag db = new DefaultDataBag();
    for (Object o : list) {
      Tuple tuple;
      if (elementSubFieldSchema.getType() == Type.STRUCT) {
        tuple = transformToTuple((List<?>) o, elementSubFieldSchema);
      } else {
        // bags always contain tuples
        tuple = tupFac.newTuple(extractPigObject(o, elementSubFieldSchema));
      }
      db.add(tuple);
    }
    return db;
  }

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    }


    public static class JiraPig1030 extends EvalFunc<DataBag> {
        
        public DataBag exec(Tuple input) throws IOException {
            return new DefaultDataBag();
        }

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        // value tuple has bags of values for currentKey
        valueTuple = tupleFact.newTuple(valuePlans.size() + 1);


        for (int i = 0; i < valuePlans.size(); i++) {
            valueTuple.set(i + 1, new DefaultDataBag(new ArrayList<Tuple>(
                    MAX_SIZE_CURVAL_CACHE)));
        }


        // set current key, add value
        currentKey = key;

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    @Test
    public void testSkewedJoinUDF() throws IOException {
        PartitionSkewedKeys udf = new PartitionSkewedKeys(new String[]{"0.1", "2", "1.txt"});
        Tuple t = TupleFactory.getInstance().newTuple();
        t.append(3);    // use 3 reducers
        DataBag db = new DefaultDataBag();
        Tuple sample;
        for (int i=0;i<=3;i++) {
            sample = TupleFactory.getInstance().newTuple();
            if (i!=3)
                sample.append("1");
            else
                sample.append("2");
            sample.append((long)200);
            if (i!=3)
                sample.append((long)0);
            else
                sample.append((long)30);
            db.add(sample);
        }
        t.append(db);
        Map<String, Object> output = udf.exec(t);
        DataBag parList = (DataBag)output.get(PartitionSkewedKeys.PARTITION_LIST);
        for (Tuple par : parList) {

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        Validate.notNull(cuboidPath, "path parameter can't be null");


        Cuboid c = path2CuboidMap.get(cuboidPath);
        Validate.notNull(c, "cuboid not found");


        DataBag db = new DefaultDataBag();


        byte[] key = new byte[c.getKeyLen()];
        walkDimensions(input, db, key, c.getCuboidDimensions(), 0, 0, TupleFactory.getInstance());


        return db;

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        Tuple tuple = TupleFactory.getInstance().newTuple(2);
            ArrayList<Tuple> columns = new ArrayList<Tuple>();
            tuple.set(0, new DataByteArray(key));
            for (Map.Entry<byte[], IColumn> entry : cf.entrySet())
                columns.add(columnToTuple(entry.getKey(), entry.getValue()));
            tuple.set(1, new DefaultDataBag(columns));
            return tuple;
        }
        catch (InterruptedException e)
        {
            throw new IOException(e.getMessage());

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        // super
        ArrayList<Tuple> subcols = new ArrayList<Tuple>();
        for (IColumn subcol : ((SuperColumn)col).getSubColumns())
            subcols.add(columnToTuple(subcol.name(), subcol));
        pair.set(1, new DefaultDataBag(subcols));
        return pair;
    }

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