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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.builtin.mock.Storage.resetData;
import static org.apache.pig.builtin.mock.Storage.tuple;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.builtin.mock.Storage.Data;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.junit.Before;
import org.junit.Test;
public class TestNullConstant {
private PigServer pigServer;
@Before
public void setUp() throws Exception{
pigServer = new PigServer(ExecType.LOCAL);
}
@Test
public void testArithExpressions() throws IOException, ExecException {
Data data = resetData(pigServer);
data.set("foo", tuple(10, 11.0));
pigServer.registerQuery("a = load 'foo' using mock.Storage() 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++) {
assertNull(t.get(i));
}
}
@Test
public void testBinCond() throws IOException, ExecException {
Data data = resetData(pigServer);
data.set("foo", tuple(10, 11.0));
pigServer.registerQuery("a = load 'foo' using mock.Storage() 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));
}
}
@Test
public void testForeachGenerate() throws ExecException, IOException {
Data data = resetData(pigServer);
data.set("foo", tuple(10, 11.0));
pigServer.registerQuery("a = load 'foo' using mock.Storage() 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));
}
}
@Test
public void testOuterJoin() throws IOException, ExecException {
Data data = resetData(pigServer);
data.set("foo_left", tuple(10, "will_join"), tuple(11, "will_not_join"));
data.set("foo_right", tuple(10, "will_join"), tuple(12, "will_not_join"));
pigServer.registerQuery("a = load 'foo_left' using mock.Storage() as (x:int, y:chararray);");
pigServer.registerQuery("b = load 'foo_right' using mock.Storage() 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));
}
}
}
@Test
public void testConcatAndSize() throws IOException, ExecException {
Data data = resetData(pigServer);
data.set("foo", tuple(10, 11.0, "will_join"));
pigServer.registerQuery("a = load 'foo' using mock.Storage() 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++) {
assertNull(t.get(i));
}
}
@Test
public void testExplicitCast() throws IOException, ExecException {
Data data = resetData(pigServer);
data.set("foo", tuple(10, 11.0, "will_join"));
pigServer.registerQuery("a = load 'foo' using mock.Storage() 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++) {
assertNull(t.get(i));
}
}
@Test
public void testComplexNullConstants() throws IOException, ExecException {
Data data = resetData(pigServer);
data.set("foo", tuple(10, 11.0, "will_join"));
pigServer.registerQuery("a = load 'foo' using mock.Storage() 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();
assertNull(((DataBag)t.get(0)).iterator().next().get(0));
assertNull(((Map<String, Object>)t.get(1)).get("2"));
}
@Test(expected = FrontendException.class)
public void testMapNullKeyFailure() throws IOException {
Data data = resetData(pigServer);
data.set("foo", tuple(10, 11.0, "will_join"));
pigServer.registerQuery("a = load 'foo' using mock.Storage() as (x:int, y:double, str:chararray);");
pigServer.registerQuery("b = foreach a generate [null#'2'];");
}
}