Examples of org.apache.pig.data.Tuple

org.apache.pig.data.Tuple
An ordered list of Data. A tuple has fields, numbered 0 through (number of fields - 1). The entry in the field can be any datatype, or it can be null.
Tuples are constructed only by a {@link TupleFactory}. A {@link DefaultTupleFactory}is provided by the system. If users wish to use their own type of Tuple, they should also provide an implementation of {@link TupleFactory} toconstruct their types of Tuples.

        pigServer.registerQuery("D = foreach C generate $0, $1;");
        
        Iterator<Tuple> iter = pigServer.openIterator("D");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("1"));
        assertTrue(t.get(1).toString().equals("{}"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("2"));
        assertTrue(t.get(1).toString().equals("{(1,2,3)}"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("5"));
        assertTrue(t.get(1).toString().equals("{(2,5,2)}"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for B: $0"}));
    }

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        pigServer.registerQuery("C = foreach B generate c1 as c1 : chararray;");
        
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.toString().equals("(1)"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        assertTrue(t.toString().equals("(2)"));


        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $1"}));
    }

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        pigServer.registerQuery("C = limit B 10;");
        
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.toString().equals("([2#1,1#1])"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $0, $2"}));
    }

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        Collection<String> results = new HashSet<String>();
        results.add("(1,2,3)");
        results.add("(2,5,2)");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(results.contains(t.toString()));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        assertTrue(results.contains(t.toString()));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for B: $0, $1"}));
    }

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        pigServer.registerQuery("C = foreach B generate $2;");
        
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.toString().equals("(3)"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $0, $1"}));
    }

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        pigServer.registerQuery("C = foreach B generate $2;");
        
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.toString().equals("(3)"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $0, $1"}));
    }

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        pigServer.registerQuery("B = order A by a2;");
        pigServer.registerQuery("C = foreach B generate a2;");
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.toString().equals("(2)"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.toString().equals("(3)"));


        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $0, $1"}));
    }

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        pigServer.registerQuery("D = cogroup A by a2, B by b2, C by c2;");
        pigServer.registerQuery("E = foreach D generate $1, $2;");
        Iterator<Tuple> iter = pigServer.openIterator("E");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        
        assertTrue(t.size()==2);
        assertTrue(t.toString().equals("({(2,5,2)},{(2,5,2)})"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        
        assertTrue(t.size()==2);
        assertTrue(t.toString().equals("({(1,2,3)},{(1,2,3)})"));


        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for C: $0, $1"}));
    }

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        pigServer.registerQuery("D = join C by a1, B by b0;");
        pigServer.registerQuery("E = foreach D generate a1, b0, b1;");
        Iterator<Tuple> iter = pigServer.openIterator("E");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        
        assertTrue(t.size()==3);
        assertTrue(t.toString().equals("(2,2,2)"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $0, $2"}));
    }

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        results.add("(2,2)");
        results.add("(1,1)");
        results.add("(2,2)");


        assertTrue(iter.hasNext());
        Tuple t = iter.next();


        assertTrue(t.size()==2);
        assertTrue(results.contains(t.toString()));


        assertTrue(iter.hasNext());
        t = iter.next();


        assertTrue(t.size()==2);
        assertTrue(results.contains(t.toString()));


        assertTrue(iter.hasNext());
        t = iter.next();


        assertTrue(t.size()==2);
        assertTrue(results.contains(t.toString()));


        assertTrue(iter.hasNext());
        t = iter.next();


        assertTrue(t.size()==2);
        assertTrue(results.contains(t.toString()));


        assertFalse(iter.hasNext());


        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $1"}));
    }

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