Package org.apache.pig.experimental.logical.relational

Examples of org.apache.pig.experimental.logical.relational.LogicalSchema

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        assertEquals( LOCogroup.class, newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0).getClass() );
        LOCogroup cogroup = (LOCogroup) newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0);
       
        // Reason for this strange way of getting the load schema is to maintain the sequence correctly       
        LogicalSchema loadSchema =
            ((LogicalRelationalOperator)newPlan.getPredecessors(cogroup).get(0)).getSchema();
       
        LogicalSchema load2Schema =
            ((LogicalRelationalOperator)newPlan.getPredecessors(cogroup).get(1)).getSchema();
       
        Set<Long> uids = getAllUids(loadSchema);
        uids.addAll( getAllUids( load2Schema ) );
       
        LogicalRelationalOperator op = (LogicalRelationalOperator)
            newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0);
        assertEquals( LOCogroup.class, op.getClass() );
        LogicalSchema schema = op.getSchema();
       
        assertEquals( 3, schema.size() );
        assertEquals( DataType.CHARARRAY, schema.getField(0).type );
        assertEquals( false, uids.contains( schema.getField(0).uid ) );
        assertEquals( 0, schema.getField(0).alias.compareTo("group") );

        assertEquals( DataType.BAG, schema.getField(1).type );
       
        assertEquals( DataType.CHARARRAY, schema.getField(1).schema.getField(0).type );
        assertEquals( 0, schema.getField(1).schema.getField(0).alias.compareTo("name") );
        assertEquals( loadSchema.getField(0).uid, schema.getField(1).schema.getField(0).uid );
        assertEquals( DataType.INTEGER, schema.getField(1).schema.getField(1).type );
        assertEquals( 0, schema.getField(1).schema.getField(1).alias.compareTo("age") );
        assertEquals( loadSchema.getField(1).uid, schema.getField(1).schema.getField(1).uid );
        assertEquals( DataType.FLOAT, schema.getField(1).schema.getField(2).type );
        assertEquals( 0, schema.getField(1).schema.getField(2).alias.compareTo("gpa") );
        assertEquals( loadSchema.getField(2).uid, schema.getField(1).schema.getField(2).uid );
       
        assertEquals( DataType.BAG, schema.getField(2).type );
       
        assertEquals( DataType.CHARARRAY, schema.getField(2).schema.getField(0).type );
        assertEquals( 0, schema.getField(2).schema.getField(0).alias.compareTo("name") );
        assertEquals( load2Schema.getField(0).uid, schema.getField(2).schema.getField(0).uid );
        assertEquals( DataType.CHARARRAY, schema.getField(2).schema.getField(1).type );
        assertEquals( 0, schema.getField(2).schema.getField(1).alias.compareTo("blah") );
        assertEquals( load2Schema.getField(1).uid, schema.getField(2).schema.getField(1).uid );       
       
       
        // We are doing Uid tests at the end as the uids should not repeat               
        assertEquals( false, uids.contains( schema.getField(1).uid ) );
        uids.add( schema.getField(1).uid );
        assertEquals( false, uids.contains( schema.getField(2).uid) );
       
        MultiMap<Integer, LogicalExpressionPlan> expressionPlans = cogroup.getExpressionPlans();
        assertEquals( 2, expressionPlans.size() );
        List<LogicalExpressionPlan> plans = (List<LogicalExpressionPlan>) expressionPlans.get(Integer.valueOf(0));
        assertEquals( 1, plans.size() );
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        assertEquals( LOCogroup.class, newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0).getClass() );
        LOCogroup cogroup = (LOCogroup) newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0);
       
        // Reason for this strange way of getting the load schema is to maintain the sequence correctly       
        LogicalSchema loadSchema =
            ((LogicalRelationalOperator)newPlan.getPredecessors(cogroup).get(0)).getSchema();
       
        LogicalSchema load2Schema =
            ((LogicalRelationalOperator)newPlan.getPredecessors(cogroup).get(1)).getSchema();
       
        Set<Long> uids = getAllUids(loadSchema);
        uids.addAll( getAllUids( load2Schema ) );
       
        LogicalRelationalOperator op = (LogicalRelationalOperator)
            newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0);
        assertEquals( LOCogroup.class, op.getClass() );
        LogicalSchema schema = op.getSchema();
       
        assertEquals( 3, schema.size() );
        assertEquals( DataType.TUPLE, schema.getField(0).type );
        assertEquals( false, uids.contains( schema.getField(0).uid ) );
        assertEquals( 0, schema.getField(0).alias.compareTo("group") );
        assertEquals( DataType.CHARARRAY, schema.getField(0).schema.getField(0).type );
        assertEquals( 0, schema.getField(0).schema.getField(0).alias.compareTo("name") );
        assertEquals( DataType.INTEGER, schema.getField(0).schema.getField(1).type );
        assertEquals( 0, schema.getField(0).schema.getField(1).alias.compareTo("age") );               
              

        assertEquals( DataType.BAG, schema.getField(1).type );
       
        assertEquals( DataType.CHARARRAY, schema.getField(1).schema.getField(0).type );
        assertEquals( 0, schema.getField(1).schema.getField(0).alias.compareTo("name") );
        assertEquals( loadSchema.getField(0).uid, schema.getField(1).schema.getField(0).uid );
        assertEquals( DataType.INTEGER, schema.getField(1).schema.getField(1).type );
        assertEquals( 0, schema.getField(1).schema.getField(1).alias.compareTo("age") );
        assertEquals( loadSchema.getField(1).uid, schema.getField(1).schema.getField(1).uid );
        assertEquals( DataType.FLOAT, schema.getField(1).schema.getField(2).type );
        assertEquals( 0, schema.getField(1).schema.getField(2).alias.compareTo("gpa") );
        assertEquals( loadSchema.getField(2).uid, schema.getField(1).schema.getField(2).uid );
       
        assertEquals( DataType.BAG, schema.getField(2).type );
       
        assertEquals( DataType.CHARARRAY, schema.getField(2).schema.getField(0).type );
        assertEquals( 0, schema.getField(2).schema.getField(0).alias.compareTo("name") );
        assertEquals( load2Schema.getField(0).uid, schema.getField(2).schema.getField(0).uid );
        assertEquals( DataType.INTEGER, schema.getField(2).schema.getField(1).type );
        assertEquals( 0, schema.getField(2).schema.getField(1).alias.compareTo("age") );
        assertEquals( load2Schema.getField(1).uid, schema.getField(2).schema.getField(1).uid );
        assertEquals( DataType.CHARARRAY, schema.getField(2).schema.getField(2).type );
        assertEquals( 0, schema.getField(2).schema.getField(2).alias.compareTo("blah") );
        assertEquals( load2Schema.getField(2).uid, schema.getField(2).schema.getField(2).uid );       
       
       
        // We are doing Uid tests at the end as the uids should not repeat
        assertEquals( false, uids.contains( schema.getField(0).schema.getField(0).uid ) );
        assertEquals( false, uids.contains( schema.getField(0).schema.getField(1).uid ) );
        assertEquals( false, uids.contains( schema.getField(1).uid ) );
        uids.add( schema.getField(1).uid );
        assertEquals( false, uids.contains( schema.getField(2).uid) );
       
       
        MultiMap<Integer, LogicalExpressionPlan> expressionPlans = cogroup.getExpressionPlans();
        assertEquals( 2, expressionPlans.size() );
        List<LogicalExpressionPlan> plans = (List<LogicalExpressionPlan>) expressionPlans.get(Integer.valueOf(0));
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        org.apache.pig.experimental.logical.relational.LogicalPlan newPlan = migratePlan(plan);
       
        org.apache.pig.experimental.logical.relational.LogicalPlan expected =
            new org.apache.pig.experimental.logical.relational.LogicalPlan();
       
        LogicalSchema aschema = new LogicalSchema();     
        aschema.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("d", null, DataType.BYTEARRAY));
        LOLoad load = new LOLoad(new FileSpec("file:///test/d.txt", new FuncSpec("org.apache.pig.builtin.PigStorage")), aschema, expected);
        expected.add(load);
       
        LOForEach foreach = new LOForEach(expected);
        org.apache.pig.experimental.logical.relational.LogicalPlan innerPlan = new org.apache.pig.experimental.logical.relational.LogicalPlan();
        LOInnerLoad l1 = new LOInnerLoad(innerPlan, foreach, 0);
        innerPlan.add(l1);
        LOInnerLoad l2 = new LOInnerLoad(innerPlan, foreach, 1);
       
        List<LogicalExpressionPlan> eps = new ArrayList<LogicalExpressionPlan>();
        LogicalExpressionPlan p1 = new LogicalExpressionPlan();
        p1.add(new ProjectExpression(p1, DataType.BYTEARRAY, 0, 0));
        LogicalExpressionPlan p2 = new LogicalExpressionPlan();
        p2.add(new ProjectExpression(p2, DataType.BYTEARRAY, 1, 0));
        eps.add(p1);
        eps.add(p2);
       
        LOGenerate gen = new LOGenerate(innerPlan, eps, new boolean[] {false, true});
        innerPlan.add(gen);
        innerPlan.connect(l1, gen);
        innerPlan.connect(l2, gen);
       
        foreach.setInnerPlan(innerPlan);     
        expected.add(foreach);
       
        LOStore s = new LOStore(expected, new FileSpec("file:///test/empty", new FuncSpec("org.apache.pig.builtin.PigStorage")));
     
        expected.add(s);
       
        expected.connect(load, foreach);
        expected.connect(foreach, s);
       
        try {
            UidStamper stamper = new UidStamper(expected);
            stamper.visit();        
        }catch(Exception e) {
            throw new VisitorException(e);
        }

        assertTrue(expected.isEqual(newPlan));
       
        LogicalSchema schema = foreach.getSchema();
        aschema = new LogicalSchema();
        aschema.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("d", null, DataType.BYTEARRAY));
        assertTrue(schema.isEqual(aschema));
    }
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        LogicalPlan plan = lpt.buildPlan("b = foreach a generate id, FLATTEN(d);"); 
               
        org.apache.pig.experimental.logical.relational.LogicalPlan newPlan = migratePlan(plan);
        LogicalRelationalOperator op = (LogicalRelationalOperator)newPlan.getSinks().get(0);
       
        LogicalSchema s2 = new LogicalSchema();
        s2.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        s2.addField(new LogicalSchema.LogicalFieldSchema("v", null, DataType.BYTEARRAY));
        s2.addField(new LogicalSchema.LogicalFieldSchema("s", null, DataType.BYTEARRAY));
        assertTrue(s2.isEqual(op.getSchema()));
       
        // test no flatten
        lpt = new LogicalPlanTester();
        lpt.buildPlan("a = load '/test/d.txt' as (id, d:bag{t:(v, s)});");
        plan = lpt.buildPlan("b = foreach a generate id, d;"); 
               
        newPlan = migratePlan(plan);
        op = (LogicalRelationalOperator)newPlan.getSinks().get(0);
       
        LogicalSchema aschema = new LogicalSchema();     
        aschema.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        LogicalSchema aschema2 = new LogicalSchema();
        LogicalSchema aschema3 = new LogicalSchema();
        aschema3.addField(new LogicalSchema.LogicalFieldSchema("v", null, DataType.BYTEARRAY));
        aschema3.addField(new LogicalSchema.LogicalFieldSchema("s", null, DataType.BYTEARRAY));
        aschema2.addField(new LogicalSchema.LogicalFieldSchema("t", aschema3, DataType.TUPLE));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("d", aschema2, DataType.BAG)); 
       
        assertTrue(aschema.isEqual(op.getSchema()));
       
        // check with defined data type
        lpt = new LogicalPlanTester();
        lpt.buildPlan("a = load '/test/d.txt' as (id, d:bag{t:(v:int, s)});");
        lpt.buildPlan("b = foreach a generate id, FLATTEN(d);");       
        plan = lpt.buildPlan("store b into '/test/empty';");
               
        newPlan = migratePlan(plan);
        op = (LogicalRelationalOperator)newPlan.getSinks().get(0);
        op = (LogicalRelationalOperator)newPlan.getPredecessors(op).get(0);
        LogicalSchema schema = op.getSchema();
       
        aschema = new LogicalSchema();
        aschema.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("v", null, DataType.INTEGER));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("s", null, DataType.BYTEARRAY));
        assertTrue(schema.isEqual(aschema));
     
   
        // test with add
        lpt = new LogicalPlanTester();
        lpt.buildPlan("a = load '/test/d.txt' as (id, v:int, s:int);");
        lpt.buildPlan("b = foreach a generate id, v+s;");       
        plan = lpt.buildPlan("store b into '/test/empty';");
       
        newPlan = migratePlan(plan);
        op = (LogicalRelationalOperator)newPlan.getSinks().get(0);
        op = (LogicalRelationalOperator)newPlan.getPredecessors(op).get(0);
        schema = op.getSchema();
       
        aschema = new LogicalSchema();
        aschema.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        aschema.addField(new LogicalSchema.LogicalFieldSchema(null, null, DataType.INTEGER));
        assertTrue(schema.isEqual(aschema));
    }      
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        org.apache.pig.experimental.logical.relational.LogicalPlan newPlan = migratePlan(plan);
       
        org.apache.pig.experimental.logical.relational.LogicalPlan expected =
            new org.apache.pig.experimental.logical.relational.LogicalPlan();
       
        LogicalSchema aschema = new LogicalSchema();     
        aschema.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        LogicalSchema aschema2 = new LogicalSchema();
        LogicalSchema aschema3 = new LogicalSchema();
        aschema3.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.INTEGER));
        aschema3.addField(new LogicalSchema.LogicalFieldSchema("s", null, DataType.BYTEARRAY));
        aschema2.addField(new LogicalSchema.LogicalFieldSchema("t", aschema3, DataType.TUPLE));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("d", aschema2, DataType.BAG));       
       
        LOLoad load = new LOLoad(new FileSpec("file:///test/d.txt", new FuncSpec("org.apache.pig.builtin.PigStorage")), aschema, expected);
        expected.add(load);        
       
        LOForEach foreach2 = new LOForEach(expected);
        org.apache.pig.experimental.logical.relational.LogicalPlan innerPlan = new org.apache.pig.experimental.logical.relational.LogicalPlan();
        LOInnerLoad l1 = new LOInnerLoad(innerPlan, foreach2, 0);
        innerPlan.add(l1);
        LOInnerLoad l2 = new LOInnerLoad(innerPlan, foreach2, 1);
       
        List<LogicalExpressionPlan>  eps = new ArrayList<LogicalExpressionPlan>();
        LogicalExpressionPlan p1 = new LogicalExpressionPlan();
        new ProjectExpression(p1, DataType.BYTEARRAY, 0, 0);
        LogicalExpressionPlan p2 = new LogicalExpressionPlan();       
        new ProjectExpression(p2, DataType.BAG, 1, 0);
        eps.add(p1);
        eps.add(p2);
       
        LOGenerate gen = new LOGenerate(innerPlan, eps, new boolean[] {false, true});
        innerPlan.add(gen);
        innerPlan.connect(l1, gen);
        innerPlan.connect(l2, gen);
       
        foreach2.setInnerPlan(innerPlan);     
        expected.add(foreach2);
               
        LOStore s = new LOStore(expected, new FileSpec("file:///test/empty", new FuncSpec("org.apache.pig.builtin.PigStorage")));
     
        expected.add(s);
       
        expected.connect(load, foreach2);
   
        expected.connect(foreach2, s);
        try {
            UidStamper stamper = new UidStamper(expected);
            stamper.visit();        
        }catch(Exception e) {
            throw new VisitorException(e);
        }
       
        assertTrue(expected.isEqual(newPlan));
       
        LogicalSchema schema = foreach2.getSchema();
        aschema = new LogicalSchema();
        aschema.addField(new LogicalSchema.LogicalFieldSchema("id", null, DataType.BYTEARRAY));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("d::id", null, DataType.INTEGER));
        aschema.addField(new LogicalSchema.LogicalFieldSchema("s", null, DataType.BYTEARRAY));
        assertTrue(schema.isEqual(aschema));
        assertTrue(schema.getField("id")==schema.getField(0));
        assertTrue(schema.getField("d::id")==schema.getField(1));
    }
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        LogicalPlan plan = lpt.buildPlan("store b into '/test/empty';");
       
        // check basics
        org.apache.pig.experimental.logical.relational.LogicalPlan newPlan = migratePlan(plan);
       
        LogicalSchema loadSchema =
            ((LogicalRelationalOperator)newPlan.getSources().get(0)).getSchema();
       
        Set<Long> uids = getAllUids(loadSchema);
       
        LogicalRelationalOperator op = (LogicalRelationalOperator)
            newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0);
        assertEquals( LOCogroup.class, op.getClass() );
        LogicalSchema schema = op.getSchema();
       
        assertEquals( 2, schema.size() );
        assertEquals( DataType.CHARARRAY, schema.getField(0).type );
        assertEquals( false, uids.contains( schema.getField(0).uid ) );
        assertEquals( 0, schema.getField(0).alias.compareTo("group") );
       
       
        assertEquals( DataType.BAG, schema.getField(1).type );
       
        assertEquals( DataType.CHARARRAY, schema.getField(1).schema.getField(0).type );
        assertEquals( 0, schema.getField(1).schema.getField(0).alias.compareTo("name") );
        assertEquals( loadSchema.getField(0).uid, schema.getField(1).schema.getField(0).uid );
        assertEquals( DataType.INTEGER, schema.getField(1).schema.getField(1).type );
        assertEquals( 0, schema.getField(1).schema.getField(1).alias.compareTo("age") );
        assertEquals( loadSchema.getField(1).uid, schema.getField(1).schema.getField(1).uid );
        assertEquals( DataType.FLOAT, schema.getField(1).schema.getField(2).type );
        assertEquals( 0, schema.getField(1).schema.getField(2).alias.compareTo("gpa") );
        assertEquals( loadSchema.getField(2).uid, schema.getField(1).schema.getField(2).uid );
       
        uids.add(Long.valueOf( schema.getField(0).uid ) );
        assertEquals( false, uids.contains( schema.getField(1).uid ) );
       
        assertEquals( LOCogroup.class, newPlan.getSuccessors(newPlan.getSources().get(0)).get(0).getClass() );
        LOCogroup cogroup = (LOCogroup) newPlan.getSuccessors(newPlan.getSources().get(0)).get(0);
       
        MultiMap<Integer, LogicalExpressionPlan> expressionPlans = cogroup.getExpressionPlans();
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        LogicalPlan plan = lpt.buildPlan("store b into '/test/empty';");
       
        // check basics
        org.apache.pig.experimental.logical.relational.LogicalPlan newPlan = migratePlan(plan);

        LogicalSchema loadSchema =
            ((LogicalRelationalOperator)newPlan.getSources().get(0)).getSchema();
       
        Set<Long> uids = getAllUids(loadSchema);
       
        LogicalRelationalOperator op = (LogicalRelationalOperator)
            newPlan.getSuccessors( newPlan.getSources().get(0) ).get(0);
        assertEquals( LOCogroup.class, op.getClass() );
        LogicalSchema schema = op.getSchema();
       
        assertEquals( 2, schema.size() );
        assertEquals( DataType.TUPLE, schema.getField(0).type );
        assertEquals( false, uids.contains( schema.getField(0).uid ) );
        assertEquals( 0, schema.getField(0).alias.compareTo("group") );
        assertEquals( DataType.CHARARRAY, schema.getField(0).schema.getField(0).type );       
        assertEquals( DataType.INTEGER, schema.getField(0).schema.getField(1).type );
       
        assertEquals( DataType.BAG, schema.getField(1).type );
       
        assertEquals( DataType.CHARARRAY, schema.getField(1).schema.getField(0).type );
        assertEquals( 0, schema.getField(1).schema.getField(0).alias.compareTo("name") );
        assertEquals( loadSchema.getField(0).uid, schema.getField(1).schema.getField(0).uid );
        assertEquals( DataType.INTEGER, schema.getField(1).schema.getField(1).type );
        assertEquals( 0, schema.getField(1).schema.getField(1).alias.compareTo("age") );
        assertEquals( loadSchema.getField(1).uid, schema.getField(1).schema.getField(1).uid );
        assertEquals( DataType.FLOAT, schema.getField(1).schema.getField(2).type );
        assertEquals( 0, schema.getField(1).schema.getField(2).alias.compareTo("gpa") );
        assertEquals( loadSchema.getField(2).uid, schema.getField(1).schema.getField(2).uid );
       
       
        // We are doing Uid tests at the end as the uids should not repeat
        uids.add(Long.valueOf( schema.getField(0).uid ) );
        assertEquals( false, uids.contains( schema.getField(0).schema.getField(0).uid ) );
        uids.add( Long.valueOf( schema.getField(0).schema.getField(0).uid ) );
        assertEquals( false, uids.contains( schema.getField(0).schema.getField(1).uid ) );
        uids.add( Long.valueOf( schema.getField(0).schema.getField(1).uid ) );       
        assertEquals( false, uids.contains( schema.getField(1).uid ) );
       
        assertEquals( LOCogroup.class, newPlan.getSuccessors(newPlan.getSources().get(0)).get(0).getClass() );
        LOCogroup cogroup = (LOCogroup) newPlan.getSuccessors(newPlan.getSources().get(0)).get(0);
       
        MultiMap<Integer, LogicalExpressionPlan> expressionPlans = cogroup.getExpressionPlans();
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        LOFilter filter = null;
        LOStore stor = null;
       
        plan = new LogicalPlan();
       
        LogicalSchema schema = new LogicalSchema();
        schema.addField(new LogicalSchema.LogicalFieldSchema("name", null, DataType.CHARARRAY));
        LogicalSchema bagSchema = new LogicalSchema();
        LogicalSchema bagTupleSchema = new LogicalSchema();
        bagTupleSchema.addField( new LogicalSchema.LogicalFieldSchema("name", null, DataType.CHARARRAY) );
        bagSchema.addField( new LogicalSchema.LogicalFieldSchema( "t", bagTupleSchema, DataType.TUPLE ) );
        schema.addField(new LogicalSchema.LogicalFieldSchema("cuisines", bagSchema, DataType.BAG));
       
        load = new LOLoad(null, schema, plan);
        load.setAlias("A");
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        LOFilter filter = null;
        LOStore stor = null;
       
        plan = new LogicalPlan();
       
        LogicalSchema schema = new LogicalSchema();
        schema.addField(new LogicalSchema.LogicalFieldSchema("name", null, DataType.CHARARRAY));
        LogicalSchema bagSchema = new LogicalSchema();
        LogicalSchema bagTupleSchema = new LogicalSchema();
        bagTupleSchema.addField( new LogicalSchema.LogicalFieldSchema("name", null, DataType.CHARARRAY) );
        bagSchema.addField( new LogicalSchema.LogicalFieldSchema( "t", bagTupleSchema, DataType.TUPLE ) );
        schema.addField(new LogicalSchema.LogicalFieldSchema("cuisines", bagSchema, DataType.BAG));
       
        load = new LOLoad(null, schema, plan);
        load.setAlias("A");
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        LOFilter filter = null;
        LOStore stor = null;
       
        plan = new LogicalPlan();
       
        LogicalSchema schema = new LogicalSchema();
        schema.addField(new LogicalSchema.LogicalFieldSchema("name", null, DataType.CHARARRAY));
        LogicalSchema bagSchema = new LogicalSchema();
        LogicalSchema bagTupleSchema = new LogicalSchema();
        bagTupleSchema.addField( new LogicalSchema.LogicalFieldSchema("name", null, DataType.CHARARRAY) );
        bagSchema.addField( new LogicalSchema.LogicalFieldSchema( "t", bagTupleSchema, DataType.TUPLE ) );
        schema.addField(new LogicalSchema.LogicalFieldSchema("cuisines", bagSchema, DataType.BAG));
       
        load = new LOLoad(null, schema, plan);
        load.setAlias("A");
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