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("B = group A by *;");
        pigServer.registerQuery("C = foreach B generate $0;");
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("(1,2,3)"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("(2,5,2)"));


        assertFalse(iter.hasNext());
        
        assertTrue(emptyLogFileMessage());
    }

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        pigServer.registerQuery("C = join A by *, B by * using \"replicated\";");
        pigServer.registerQuery("D = foreach C generate $0;");
        Iterator<Tuple> iter = pigServer.openIterator("D");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("1"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("1"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(emptyLogFileMessage());
    }

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

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        pigServer.registerQuery("B = foreach A generate StringSize(*);");
        pigServer.registerQuery("C = foreach B generate $0;");
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("1"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("1"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(emptyLogFileMessage());
    }

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

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        pigServer.registerQuery("B = filter A by " + MyFilterFunc.class.getName() + "(*) ;");
        pigServer.registerQuery("C = foreach B generate $0;");
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("1"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        
        assertTrue(t.size()==1);
        assertTrue(t.get(0).toString().equals("2"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(emptyLogFileMessage());
    }

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        pigServer.registerQuery("B = foreach A generate a0, a1#'key1';");
        
        Iterator<Tuple> iter = pigServer.openIterator("B");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).equals(1));
        assertTrue(t.get(1).toString().equals("1"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).equals(2));
        assertTrue(t.get(1).toString().equals("2"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Map key required for A: $1->[key1]"}));
    }

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        pigServer.registerQuery("C = foreach B generate $0#'key2', $1;");
        
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("2"));
        assertTrue(t.get(1).toString().equals("1"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("4"));
        assertTrue(t.get(1).toString().equals("2"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $0", 
                "Map key required for A: $1->[key2, key1]"}));

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        pigServer.registerQuery("C = group B all;");
        
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("all"));
        assertTrue(t.get(1).toString().equals("{([key2#2,key1#1],1),([key2#4,key1#2],2)}"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Columns pruned for A: $0"}));
    }

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        pigServer.registerQuery("C = foreach B generate $0, $1#'key1';");
        
        Iterator<Tuple> iter = pigServer.openIterator("C");
        
        assertTrue(iter.hasNext());
        Tuple t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("1"));
        assertTrue(t.get(1).toString().equals("1"));
        
        assertTrue(iter.hasNext());
        t = iter.next();
        assertTrue(t.size()==2);
        assertTrue(t.get(0).toString().equals("2"));
        assertTrue(t.get(1).toString().equals("2"));
        
        assertFalse(iter.hasNext());
        
        assertTrue(checkLogFileMessage(new String[]{"Map key required for A: $1->[key1]"}));
    }

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