| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * 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.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| import static org.junit.Assert.fail; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.Iterator; |
| |
| import org.apache.pig.PigServer; |
| import org.apache.pig.data.Tuple; |
| import org.junit.AfterClass; |
| import org.junit.Test; |
| |
| public class TestScalarAliases { |
| static MiniGenericCluster cluster = MiniGenericCluster.buildCluster(); |
| private PigServer pigServer; |
| |
| @AfterClass |
| public static void oneTimeTearDown() throws Exception { |
| cluster.shutDown(); |
| } |
| |
| public static void deleteDirectory(File file) { |
| if (file.exists()) { |
| Util.deleteDirectory(file); |
| } |
| } |
| |
| public static File createLocalInputFile(String filename, String[] inputData) |
| throws IOException { |
| new File(filename).getParentFile().mkdirs(); |
| return Util.createLocalInputFile(filename, inputData); |
| } |
| |
| // See PIG-1434 |
| @Test |
| public void testScalarAliasesSplitClause() throws Exception{ |
| pigServer = new PigServer(cluster.getExecType(), cluster.getProperties()); |
| String[] input = { |
| "1\t5", |
| "2\t10", |
| "3\t20" |
| }; |
| |
| // Test the use of scalars in expressions |
| String inputPath = "table_testScalarAliasesSplitClause"; |
| String output = "table_testScalarAliasesSplitClauseDir"; |
| Util.createInputFile(cluster, inputPath, input); |
| // Test in script mode |
| pigServer.setBatchOn(); |
| pigServer.registerQuery("A = LOAD '"+inputPath+"' as (a0: long, a1: double);"); |
| pigServer.registerQuery("B = group A all;"); |
| pigServer.registerQuery("C = foreach B generate COUNT(A) as count;"); |
| pigServer.registerQuery("split A into Y if (2 * C.count) < a1, X if a1 == 5;"); |
| pigServer.registerQuery("Store Y into '"+output+"';"); |
| pigServer.executeBatch(); |
| // Check output |
| pigServer.registerQuery("Z = LOAD '"+output+"' as (a0: int, a1: double);"); |
| |
| Iterator<Tuple> iter = pigServer.openIterator("Z"); |
| |
| // Y gets only last 2 elements |
| Tuple t = iter.next(); |
| assertTrue(t.toString().equals("(2,10.0)")); |
| |
| t = iter.next(); |
| assertTrue(t.toString().equals("(3,20.0)")); |
| |
| assertFalse(iter.hasNext()); |
| Util.deleteFile(cluster, output); |
| |
| } |
| |
| @Test |
| public void testScalarErrMultipleRowsInInput() throws Exception{ |
| Util.resetStateForExecModeSwitch(); |
| pigServer = new PigServer(cluster.getExecType(), cluster.getProperties()); |
| String[] input = { |
| "1\t5", |
| "2\t10", |
| "3\t20" |
| }; |
| String INPUT_FILE = "table_testScalarAliasesMulRows"; |
| Util.createInputFile(cluster, INPUT_FILE, input); |
| pigServer.registerQuery("A = LOAD '" + INPUT_FILE + "' as (a0: long, a1: double);"); |
| pigServer.registerQuery("B = LOAD '" + INPUT_FILE + "' as (b0: long, b1: double);"); |
| pigServer.registerQuery("C = foreach A generate $0, B.$0;"); |
| try { |
| pigServer.openIterator("C"); |
| fail("exception expected - scalar input has multiple rows"); |
| } catch (IOException pe){ |
| Util.checkStrContainsSubStr(pe.getCause().getMessage(), |
| "Scalar has more than one row in the output" |
| ); |
| } |
| } |
| } |