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 * Licensed to the Apache Software Foundation (ASF) under one
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 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pig.test;


import static org.apache.pig.test.utils.TypeCheckingTestUtil.printTypeGraph;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.util.HashMap;
import java.util.Iterator;

import org.apache.pig.PigServer;
import org.apache.pig.data.Tuple;
import org.apache.pig.newplan.logical.relational.LogicalRelationalOperator;
import org.apache.pig.newplan.logical.relational.LogicalSchema;
import org.junit.After;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.Test;

public class TestImplicitSplit {
    private PigServer pigServer;
    static MiniGenericCluster cluster = MiniGenericCluster.buildCluster();

    @Before
    public void setUp() throws Exception {
        pigServer = new PigServer(cluster.getExecType(), cluster.getProperties());
    }

    @After
    public void tearDown() throws Exception {
    }

    @AfterClass
    public static void oneTimeTearDown() throws Exception {
        cluster.shutDown();
    }

    @Test
    public void testImplicitSplit() throws Exception{
        int LOOP_SIZE = 20;
        String[] input = new String[LOOP_SIZE];
        for(int i = 1; i <= LOOP_SIZE; i++) {
            input[i-1] = Integer.toString(i);
        }
        String inputFileName = "testImplicitSplit-input.txt";
        Util.createInputFile(cluster, inputFileName, input);
        pigServer.registerQuery("A = LOAD '" + inputFileName + "';");
        pigServer.registerQuery("B = filter A by $0<=10;");
        pigServer.registerQuery("C = filter A by $0>10;");
        pigServer.registerQuery("D = union B,C;");
        Iterator<Tuple> iter = pigServer.openIterator("D");
        if(!iter.hasNext()) fail("No Output received");
        int cnt = 0;
        while(iter.hasNext()){
            Tuple t = iter.next();
            ++cnt;
        }
        assertEquals(20, cnt);
        Util.deleteFile(cluster, inputFileName);
    }

    @Test
    public void testImplicitSplitInCoGroup() throws Exception {
        // this query is similar to the one reported in JIRA - PIG-537
        // Create input file
        String input1 = "testImplicitSplitInCoGroup-input1.txt";
        String input2 = "testImplicitSplitInCoGroup-input2.txt";
        Util.createInputFile(cluster, input1,
                new String[] {"a:1", "b:2", "b:20", "c:3", "c:30"});
        Util.createInputFile(cluster, input2,
                new String[] {"a:first", "b:second", "c:third"});
        pigServer.registerQuery("a = load '" + input1 +
                "' using PigStorage(':') as (name:chararray, marks:int);");
        pigServer.registerQuery("b = load '" + input2 +
                "' using PigStorage(':') as (name:chararray, rank:chararray);");
        pigServer.registerQuery("c = cogroup a by name, b by name;");
        pigServer.registerQuery("d = foreach c generate group, FLATTEN(a.marks) as newmarks;");
        pigServer.registerQuery("e = cogroup a by marks, d by newmarks;");
        pigServer.registerQuery("f = foreach e generate group, flatten(a), flatten(d);");
        HashMap<Integer, Object[]> results = new HashMap<Integer, Object[]>();
        results.put(1, new Object[] { "a", 1, "a", 1 });
        results.put(2, new Object[] { "b", 2, "b", 2 });
        results.put(3, new Object[] { "c", 3, "c", 3 });
        results.put(20, new Object[] { "b", 20, "b", 20 });
        results.put(30, new Object[] { "c", 30, "c", 30 });

        Iterator<Tuple> it = pigServer.openIterator("f");
        while(it.hasNext()) {
            Tuple t = it.next();
            System.err.println("Tuple:" + t);
            Integer group = (Integer)t.get(0);
            Object[] groupValues = results.get(group);
            for(int i = 0; i < 4; i++) {
                assertEquals(groupValues[i], t.get(i+1));
            }
        }
        Util.deleteFile(cluster, input1);
        Util.deleteFile(cluster, input2);
    }

    @Test
    public void testImplicitSplitInCoGroup2() throws Exception {
        // this query is similar to the one reported in JIRA - PIG-537
        String query = "a = load 'file1' using PigStorage(':') as (name:chararray, marks:int);" +
                       "b = load 'file2' using PigStorage(':') as (name:chararray, rank:chararray);" +
                       "c = cogroup a by name, b by name;" +
                       "d = foreach c generate group, FLATTEN(a.marks) as newmarks;" +
                       "e = cogroup a by marks, d by newmarks;" +
                       "f = foreach e generate group, flatten(a), flatten(d);" +
                       "store f into 'output';";
        org.apache.pig.newplan.logical.relational.LogicalPlan plan = Util.buildLp(pigServer, query);

        printTypeGraph(plan) ;

        // this will run ImplicitSplitInserter
        Util.optimizeNewLP(plan);

        // get Schema of leaf and compare:
        String schema = "group:int,a::name:chararray,a::marks:int,d::group:chararray,d::newmarks:int";
        LogicalSchema sch = ((LogicalRelationalOperator)plan.getSinks().get(0)).getSchema();
        assertTrue( schema.equals( sch.toString( false ) ) );
    }
}