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.

    @Test
    public void testUDFContextReset() throws Exception {
        PigServer pig = new PigServer(ExecType.LOCAL);
        pig.registerQuery(" l = load 'file' as (a :int, b : int, c : int);");
        pig.registerQuery(" f = foreach l generate a, b;");
        pig.explain("f", System.out);
        Properties props = UDFContext.getUDFContext().getUDFProperties(PigStorage.class);


        // required fields property should be set because f results does not
        // require the third column c, so properties should not be null
        assertTrue(

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                props.keySet().size()>0);


        // the new statement for alias f below will require all columns,
        // so this time required fields property for loader should not be set
        pig.registerQuery(" f = foreach l generate a, b, c;");
        pig.explain("f", System.out);
        props = UDFContext.getUDFContext().getUDFProperties(PigStorage.class);


        assertTrue(
                "properties in udf context for load should be empty: "+props,
                props.keySet().size() == 0);

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         PigServer pig = new PigServer(ExecType.LOCAL);


         boolean foundEx = false;
         try{
             Util.registerMultiLineQuery(pig, query);
             pig.explain(alias, System.out);
         }catch(FrontendException e){
             foundEx = true;
             checkMessageInException(e, expectedErr);
         }

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         PigServer pig = new PigServer(ExecType.LOCAL);


         boolean foundEx = false;
         try{
             Util.registerMultiLineQuery(pig, query);
             pig.explain(alias, System.out);
         }catch(FrontendException e){
             foundEx = true;
             checkMessageInException(e, expectedErr);
         }

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    public void testNullInBinCondNoSpace() throws IOException{
        String query = "a = load '1.txt' as (a0, a1);" +
        "b = foreach a generate (a0==0?null:2);"; //no space around the null keyword, so the lexer doesn't emit a NULL token
        PigServer pig = new PigServer(ExecType.LOCAL);
        Util.registerMultiLineQuery(pig, query);
        pig.explain("b", System.out);
    }


    @Test
    public void testAST() throws IOException, RecognitionException  {
        CharStream input = new QueryParserFileStream( "test/org/apache/pig/parser/TestAST.pig" );

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        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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                "        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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        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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