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.

        assertNotNull(props.get("l"));
        
        // 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 null", 
                props.get("l") == null);

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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
        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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    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
        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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         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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    @Test
    public void testUDFContextReset() throws Exception {
        PigServer pig = new PigServer(ExecType.LOCAL, new Properties());
        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
        assertNotNull(props.get("l"));

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        assertNotNull(props.get("l"));
        
        // 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 null", 
                props.get("l") == null);

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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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