Examples of org.apache.pig.PigServer.explain()

org.apache.pig.PigServer.explain()
Provide information on how a pig query will be executed. For now this information is very developer focussed, and probably not very useful to the average user. @param alias Name of alias to explain. @param stream PrintStream to write explanation to. @throws IOException if the requested alias cannot be found.

        pig.registerQuery("a = load 'a.txt' ;");
        pig.registerQuery("b = load 'b.txt';");
        pig.registerQuery("c = union a, b;");
        pig.registerQuery("d = load 'c.txt' ;");
        pig.registerQuery("e = cogroup c by $0 inner, d by $0 inner;");
        pig.explain("e", System.err);
        // output should be 
        // (1,{(1,2,3),(1,200,300)},{(1,20,30)})
        Tuple expectedResult = new DefaultTuple();
        expectedResult.append(new DataByteArray("1"));
        Tuple[] secondFieldContents = new DefaultTuple[2];

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            +       ", t : tuple (tc1 : int, tc2 : chararray) );"
            + "l3 = load '" + INP_FILE_EMPTY + "' as (i : int, x : long);"
            + "u = union onschema l1, l2, l3;"
        ; 
        Util.registerMultiLineQuery(pig, query);
        pig.explain("u", System.out);


        Iterator<Tuple> it = pig.openIterator("u");
        
        List<Tuple> expectedRes = 
            Util.getTuplesFromConstantTupleStrings(

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            + "  (i : long, c : chararray, j : int " 
            +       ", b : bag { t : tuple (c1 : int, c2 : chararray)} ); "
            + "u = union onschema l1, l2, l3;"
        ; 
        Util.registerMultiLineQuery(pig, query);
        pig.explain("u", System.out);


        Iterator<Tuple> it = pig.openIterator("u");
        
        List<Tuple> expectedRes = 
            Util.getTuplesFromConstantTupleStrings(

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            + "  (i : long, c : chararray, j : int " 
            +       ", b : bag { t : tuple (c1 : int, c2 : chararray)} ); "
            + "u = union onSchema l1, l2;"
        ; 
        Util.registerMultiLineQuery(pig, query);
        pig.explain("u", System.out);


        Iterator<Tuple> it = pig.openIterator("u");
        
        List<Tuple> expectedRes = 
            Util.getTuplesFromConstantTupleStrings(

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        pigServer.registerQuery("c = foreach b generate COUNT(a), SUM(a.$0), MIN(a.$0), MAX(a.$0), AVG(a.$0);");


        // make sure there is a combine plan in the explain output
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        pigServer.explain("c", ps);
        assertTrue(baos.toString().matches("(?si).*combine plan.*"));


        Iterator<Tuple> it = pigServer.openIterator("c");
        Tuple t = it.next();
        assertEquals(512000L, t.get(0));

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            "                       SUM(a.gpa), COUNT(z.age), COUNT(z), SUM(z.age);};");
        
        // make sure there is a combine plan in the explain output
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        pigServer.explain("c", ps);
        assertTrue(baos.toString().matches("(?si).*combine plan.*"));


        HashMap<String, Object[]> results = new HashMap<String, Object[]>();
        results.put("pig1", new Object[] {"pig1",3L,57L,5.2,75L,9.4,3L,3L,57L});
        results.put("pig2", new Object[] {"pig2",1L,24L,7.8,48L,7.8,2L,2L,48L});

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                "        generate group, z, SUM(a.age), SUM(a.gpa);};");
        
        // make sure there is a combine plan in the explain output
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        pigServer.explain("c", ps);
        assertFalse(baos.toString().matches("(?si).*combine plan.*"));


        HashMap<String, Object[]> results = new HashMap<String, Object[]>();
        results.put("pig1", new Object[] {"pig1","bag-place-holder",75L,9.4});
        results.put("pig2", new Object[] {"pig2","bag-place-holder",48L,7.8});

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                "        generate group, z, SUM(a.age), SUM(a.gpa);};");
        
        // make sure there is a combine plan in the explain output
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        pigServer.explain("c", ps);
        assertFalse(baos.toString().matches("(?si).*combine plan.*"));


        HashMap<String, Object[]> results = new HashMap<String, Object[]>();
        results.put("pig1", new Object[] {"pig1","bag-place-holder",75L,9.4});
        results.put("pig2", new Object[] {"pig2","bag-place-holder",48L,7.8});

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                    "        generate group, SUM(a.age), a;};");
            
            // make sure there isn't a combine plan in the explain output
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            PrintStream ps = new PrintStream(baos);
            pigServer.explain("c", ps);
            assertFalse(baos.toString().matches("(?si).*combine plan.*"));
    
            Iterator<Tuple> it = pigServer.openIterator("c");
            int count = 0;
            while (it.hasNext()) {

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                    "        generate group, " + JiraPig1030.class.getName() + "(d, 0);};");
            
            // make sure there isn't a combine plan in the explain output
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            PrintStream ps = new PrintStream(baos);
            pigServer.explain("c", ps);
            assertFalse(baos.toString().matches("(?si).*combine plan.*"));    
        } catch (Exception e) {
            e.printStackTrace();
            Assert.fail();
        } finally {

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