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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.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Properties;
import java.util.Set;
import org.apache.pig.EvalFunc;
import org.apache.pig.ExecType;
import org.apache.pig.PigServer;
import org.apache.pig.backend.hadoop.datastorage.ConfigurationUtil;
import org.apache.pig.data.SchemaTupleBackend;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.PigContext;
import org.apache.pig.newplan.OperatorPlan;
import org.apache.pig.newplan.logical.optimizer.LogicalPlanOptimizer;
import org.apache.pig.newplan.logical.relational.LogicalPlan;
import org.apache.pig.newplan.logical.rules.FilterConstantCalculator;
import org.apache.pig.newplan.logical.rules.ForEachConstantCalculator;
import org.apache.pig.newplan.optimizer.PlanOptimizer;
import org.apache.pig.newplan.optimizer.Rule;
import org.junit.Before;
import org.junit.Test;
public class TestConstantCalculator {
PigContext pc = null;
PigServer pigServer = null;
@Before
public void setUp() throws Exception {
pigServer = new PigServer(ExecType.LOCAL, new Properties());
pc = pigServer.getPigContext();
SchemaTupleBackend.initialize(ConfigurationUtil.toConfiguration(pc.getProperties(), true),
pc);
}
@Test
public void test() throws Exception {
// pure simple constant
assertQuerySame("b = filter (load 'd.txt' as (id:int, v1, v2)) by id > 3+5;" +
"store b into 'empty';",
"b = filter (load 'd.txt' as (id:int, v1, v2)) by id > 8;" +
"store b into 'empty';");
// simple constant mixed with column
assertQuerySame("b = foreach (load 'd.txt' as (id:int, v1, v2)) generate id * (3 * 5);" +
"store b into 'empty';",
"b = foreach (load 'd.txt' as (id:int, v1, v2)) generate id * 15;" +
"store b into 'empty';");
// boolean constant calculation
assertQuerySame("b = filter (load 'd.txt' as (id:int, v1, v2)) by 5 + 1 > 3 and -1 < 4;" +
"store b into 'empty';",
"b = filter (load 'd.txt' as (id:int, v1, v2)) by true;" +
"store b into 'empty';");
// simple cast
assertQuerySame("b = foreach (load 'd.txt' as (d:double)) generate (int)5.0;" +
"store b into 'empty';",
"b = foreach (load 'd.txt' as (d:double)) generate 5;" +
"store b into 'empty';");
// more calculation
assertQuerySame("b = foreach (load 'd.txt' as (d:double)) generate ((int)15.89 + 5) * 5 / 25 % 3;" +
"store b into 'empty';",
"b = foreach (load 'd.txt' as (d:double)) generate 1;" +
"store b into 'empty';");
// udf calculation
assertQuerySame("b = foreach (load 'd.txt' as (v1)) generate UPPER(CONCAT('a', CONCAT('b', 'c'), 'd'));" +
"store b into 'empty';",
"b = foreach (load 'd.txt' as (v1)) generate 'ABCD';" +
"store b into 'empty';");
// udf not eligible for optimize
assertQuerySame("b = foreach (load 'd.txt' as (v1)) generate " + NoCalc.class.getName() + "('2');" +
"store b into 'empty';",
"b = foreach (load 'd.txt' as (v1)) generate " + NoCalc.class.getName() + "('2');" +
"store b into 'empty';");
// solo udf
assertQuerySame("b = foreach (load 'd.txt' as (v1)) generate " + StringSpecified.class.getName() + "();" +
"store b into 'empty';",
"b = foreach (load 'd.txt' as (v1)) generate '1';" +
"store b into 'empty';");
}
public static class NoCalc extends EvalFunc<String> {
@Override
public String exec(Tuple input) throws IOException {
return "1";
}
}
public static class StringSpecified extends EvalFunc<String> {
@Override
public String exec(Tuple input) throws IOException {
return "1";
}
@Override
public boolean allowCompileTimeCalculation() {
return true;
}
}
private void assertQuerySame(String origQuery, String optimizedQuery) throws Exception {
LogicalPlan newLogicalPlan = Util.buildLp(pigServer, origQuery);
SchemaTupleBackend.initialize(ConfigurationUtil.toConfiguration(pc.getProperties(), true),
pc);
PlanOptimizer optimizer = new MyPlanOptimizer(newLogicalPlan, 10);
optimizer.optimize();
LogicalPlan expected = Util.buildLp(pigServer, optimizedQuery);
assertTrue(expected.isEqual(newLogicalPlan));
}
public class MyPlanOptimizer extends LogicalPlanOptimizer {
protected MyPlanOptimizer(OperatorPlan p, int iterations) {
super(p, iterations, null);
}
protected List<Set<Rule>> buildRuleSets() {
List<Set<Rule>> ls = new ArrayList<Set<Rule>>();
// Logical expression simplifier
Set <Rule> s = new HashSet<Rule>();
// add constant calculator rule
Rule r = new FilterConstantCalculator("FilterConstantCalculator", pc);
s.add(r);
r = new ForEachConstantCalculator("ForEachConstantCalculator", pc);
s.add(r);
ls.add(s);
return ls;
}
}
}