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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,
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* See the License for the specific language governing permissions and
* limitations under the License.
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package org.apache.pig.test;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import junit.framework.TestCase;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.Tuple;
import org.junit.AfterClass;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
@RunWith(JUnit4.class)
public class TestNullConstant extends TestCase {
static MiniCluster cluster = MiniCluster.buildCluster();
private PigServer pigServer;
@Before
@Override
public void setUp() throws Exception{
pigServer = new PigServer(ExecType.MAPREDUCE, cluster.getProperties());
}
@AfterClass
public static void oneTimeTearDown() throws Exception {
cluster.shutDown();
}
@Test
public void testArithExpressions() throws IOException, ExecException {
String inputFileName = "testArithExpressions-input.txt";
Util.createInputFile(cluster, inputFileName,
new String[] {"10\t11.0"});
pigServer.registerQuery("a = load '" + inputFileName + "' as (x:int, y:double);");
pigServer.registerQuery("b = foreach a generate x + null, x * null, x / null, x - null, null % x, " +
"y + null, y * null, y / null, y - null;");
Iterator<Tuple> it = pigServer.openIterator("b");
Tuple t = it.next();
for (int i = 0; i < 9; i++) {
assertEquals(null, t.get(i));
}
Util.deleteFile(cluster, inputFileName);
}
@Test
public void testBinCond() throws IOException, ExecException {
String inputFileName = "testBinCond-input.txt";
Util.createInputFile(cluster, inputFileName,
new String[] {"10\t11.0"});
pigServer.registerQuery("a = load '" + inputFileName + "' as (x:int, y:double);");
pigServer.registerQuery("b = foreach a generate (2 > 1? null : 1), ( 2 < 1 ? null : 1), (2 > 1 ? 1 : null), ( 2 < 1 ? 1 : null);");
Iterator<Tuple> it = pigServer.openIterator("b");
Tuple t = it.next();
Object[] result = new Object[] { null, 1, 1, null};
for (int i = 0; i < 4; i++) {
assertEquals(result[i], t.get(i));
}
// is null and is not null test
pigServer.registerQuery("b = foreach a generate (null is null ? 1 : 2), ( null is not null ? 2 : 1);");
it = pigServer.openIterator("b");
t = it.next();
for (int i = 0; i < 2; i++) {
assertEquals(1, t.get(i));
}
Util.deleteFile(cluster, inputFileName);
}
@Test
public void testForeachGenerate() throws ExecException, IOException {
String inputFileName = "testForeachGenerate-input.txt";
Util.createInputFile(cluster, inputFileName,
new String[] {"10\t11.0"});
pigServer.registerQuery("a = load '" + inputFileName + "' as (x:int, y:double);");
pigServer.registerQuery("b = foreach a generate x, null, y, null;");
Iterator<Tuple> it = pigServer.openIterator("b");
Tuple t = it.next();
Object[] result = new Object[] { 10, null, 11.0, null};
for (int i = 0; i < 4; i++) {
assertEquals(result[i], t.get(i));
}
Util.deleteFile(cluster, inputFileName);
}
@Test
public void testOuterJoin() throws IOException, ExecException {
String inputFileName1 = "testOuterJoin-input1.txt";
Util.createInputFile(cluster, inputFileName1,
new String[] {"10\twill_join", "11\twill_not_join"});
String inputFileName2 = "testOuterJoin-input2.txt";
Util.createInputFile(cluster, inputFileName2,
new String[] {"10\twill_join", "12\twill_not_join"});
pigServer.registerQuery("a = load '" + inputFileName1 + "' as (x:int, y:chararray);");
pigServer.registerQuery("b = load '" + inputFileName2 + "' as (u:int, v:chararray);");
pigServer.registerQuery("c = cogroup a by x, b by u;");
pigServer.registerQuery("d = foreach c generate flatten((SIZE(a) == 0 ? null: a)), flatten((SIZE(b) == 0 ? null : b));");
Iterator<Tuple> it = pigServer.openIterator("d");
Object[][] results = new Object[][]{{10, "will_join", 10, "will_join"}, {11, "will_not_join", null}, {null, 12, "will_not_join"}};
int i = 0;
while(it.hasNext()) {
Tuple t = it.next();
Object[] result = results[i++];
assertEquals(result.length, t.size());
for (int j = 0; j < result.length; j++) {
assertEquals(result[j], t.get(j));
}
}
Util.deleteFile(cluster, inputFileName1);
Util.deleteFile(cluster, inputFileName2);
}
@Test
public void testConcatAndSize() throws IOException, ExecException {
String inputFileName = "testConcatAndSize-input.txt";
Util.createInputFile(cluster, inputFileName,
new String[] {"10\t11.0\tstring"});
pigServer.registerQuery("a = load '" + inputFileName + "' as (x:int, y:double, str:chararray);");
pigServer.registerQuery("b = foreach a generate SIZE(null), CONCAT(str, null), " +
"CONCAT(null, str);");
Iterator<Tuple> it = pigServer.openIterator("b");
Tuple t = it.next();
for (int i = 0; i < 3; i++) {
assertEquals(null, t.get(i));
}
Util.deleteFile(cluster, inputFileName);
}
@Test
public void testExplicitCast() throws IOException, ExecException {
String inputFileName = "testExplicitCast-input.txt";
Util.createInputFile(cluster, inputFileName,
new String[] {"10\t11.0\tstring"});
pigServer.registerQuery("a = load '" + inputFileName + "' as (x:int, y:double, str:chararray);");
pigServer.registerQuery("b = foreach a generate (int)null, (double)null, (chararray)null, (map[])null;");
Iterator<Tuple> it = pigServer.openIterator("b");
Tuple t = it.next();
for (int i = 0; i < 3; i++) {
assertEquals(null, t.get(i));
}
Util.deleteFile(cluster, inputFileName);
}
@Test
public void testComplexNullConstants() throws IOException, ExecException {
String inputFileName = "testComplexNullConstants-input.txt";
Util.createInputFile(cluster, inputFileName,
new String[] {"10\t11.0\tstring"});
pigServer.registerQuery("a = load '" + inputFileName + "' as (x:int, y:double, str:chararray);");
pigServer.registerQuery("b = foreach a generate {(null)}, ['2'#null];");
Iterator<Tuple> it = pigServer.openIterator("b");
Tuple t = it.next();
assertEquals(null, ((DataBag)t.get(0)).iterator().next().get(0));
assertEquals(null, ((Map<String, Object>)t.get(1)).get("2"));
Util.deleteFile(cluster, inputFileName);
}
@Test
public void testMapNullKeyFailure() throws IOException {
String inputFileName = "testMapNullKeyFailure-input.txt";
Util.createInputFile(cluster, inputFileName,
new String[] {"10\t11.0\tstring"});
pigServer.registerQuery("a = load '" + inputFileName + "' as (x:int, y:double, str:chararray);");
boolean exceptionOccured = false;
try {
pigServer.registerQuery("b = foreach a generate [null#'2'];");
} catch(Exception e) {
exceptionOccured = true;
}
Util.deleteFile(cluster, inputFileName);
if(!exceptionOccured) fail();
}
}