/**
* 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.hadoop.zebra.io;
import java.io.IOException;
import java.util.List;
import junit.framework.Assert;
import junit.framework.TestCase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocalFileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RawLocalFileSystem;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.zebra.io.BasicTable;
import org.apache.hadoop.zebra.io.TableInserter;
import org.apache.hadoop.zebra.io.TableScanner;
import org.apache.hadoop.zebra.io.BasicTable.Reader.RangeSplit;
import org.apache.hadoop.zebra.types.ParseException;
import org.apache.hadoop.zebra.types.Projection;
import org.apache.hadoop.zebra.types.Schema;
import org.apache.hadoop.zebra.types.TypesUtils;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.Tuple;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;
public class TestBasicTableProjections {
private static Configuration conf;
private static Path path;
private static FileSystem fs;
@BeforeClass
public static void setUpOnce() throws IOException {
conf = new Configuration();
conf.setInt("table.output.tfile.minBlock.size", 64 * 1024);
conf.setInt("table.input.split.minSize", 64 * 1024);
conf.set("table.output.tfile.compression", "none");
RawLocalFileSystem rawLFS = new RawLocalFileSystem();
fs = new LocalFileSystem(rawLFS);
path = new Path(fs.getWorkingDirectory(), "TestBasicTableProjections");
fs = path.getFileSystem(conf);
// drop any previous tables
BasicTable.drop(path, conf);
BasicTable.Writer writer = new BasicTable.Writer(path, "a,b,c,d,e,f,g",
"[a,b,c];[d,e,f,g]", false, conf);
writer.finish();
Schema schema = writer.getSchema();
// String[] colNames = schema.getColumns();
Tuple tuple = TypesUtils.createTuple(schema);
// BytesWritable key;
int parts = 2;
for (int part = 0; part < parts; part++) {
writer = new BasicTable.Writer(path, conf);
TableInserter inserter = writer.getInserter("part" + part, true);
TypesUtils.resetTuple(tuple);
for (int row = 0; row < 2; row++) {
try {
for (int nx = 0; nx < tuple.size(); nx++)
tuple.set(nx, String.format("%c%d%d", 'a' + nx, part + 1, row + 1));
} catch (ExecException e) {
e.printStackTrace();
}
inserter.insert(new BytesWritable(String.format("k%d%d", part + 1,
row + 1).getBytes()), tuple);
}
inserter.close();
writer.finish();
}
writer.close();
}
@AfterClass
public static void tearDownOnce() throws IOException {
}
@Test
public void test1() throws IOException, ParseException {
String projection = new String("f,a");
Configuration conf = new Configuration();
BasicTable.Reader reader = new BasicTable.Reader(path, conf);
reader.setProjection(projection);
// long totalBytes = reader.getStatus().getSize();
List<RangeSplit> splits = reader.rangeSplit(1);
reader.close();
reader = new BasicTable.Reader(path, conf);
reader.setProjection(projection);
TableScanner scanner = reader.getScanner(splits.get(0), true);
BytesWritable key = new BytesWritable();
Tuple value = TypesUtils.createTuple(scanner.getSchema());
scanner.getKey(key);
Assert.assertEquals(key, new BytesWritable("k11".getBytes()));
scanner.getValue(value);
Assert.assertEquals("f11", value.get(0));
Assert.assertEquals("a11", value.get(1));
try {
value.get(2);
Assert.fail("Failed to catch out of boundary exceptions.");
} catch (ExecException e) {
// no op, expecting out of bounds exceptions
}
scanner.advance();
scanner.getKey(key);
Assert.assertEquals(key, new BytesWritable("k12".getBytes()));
TypesUtils.resetTuple(value);
scanner.getValue(value);
Assert.assertEquals("f12", value.get(0));
Assert.assertEquals("a12", value.get(1));
scanner.advance();
scanner.getKey(key);
Assert.assertEquals(key, new BytesWritable("k21".getBytes()));
TypesUtils.resetTuple(value);
scanner.getValue(value);
Assert.assertEquals("f21", value.get(0));
Assert.assertEquals("a21", value.get(1));
scanner.advance();
scanner.getKey(key);
Assert.assertEquals(key, new BytesWritable("k22".getBytes()));
TypesUtils.resetTuple(value);
scanner.getValue(value);
Assert.assertEquals("f22", value.get(0));
Assert.assertEquals("a22", value.get(1));
}
}