/**
* 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.hive.ql.exec;
import junit.framework.TestCase;
import java.util.Arrays;
public class TestPartitionKeySampler extends TestCase {
private static final byte[] _100 = "100".getBytes();
private static final byte[] _200 = "200".getBytes();
private static final byte[] _300 = "300".getBytes();
private static final byte[] _400 = "400".getBytes();
// current random sampling implementation in InputSampler always returns
// value of index 3, 5, 8, which can be same with previous partition key.
// That induces "Split points are out of order" exception in TotalOrderPartitioner causing HIVE-7699
public void test() throws Throwable {
byte[][] sampled;
sampled = new byte[][] {
_100, _100, _100, _100, _100, _100, _100, _100, _100, _100
};
assertKeys(sampled, _100); // 3
sampled = new byte[][] {
_100, _100, _100, _100, _100, _100, _100, _100, _200, _200
};
assertKeys(sampled, _100, _200); // 3, 8
sampled = new byte[][] {
_100, _100, _100, _100 , _200, _200, _200, _300, _300, _300
};
assertKeys(sampled, _100, _200, _300); // 3, 5, 8
sampled = new byte[][] {
_100, _200, _200, _200, _200, _200, _200, _300, _300, _400
};
assertKeys(sampled, _200, _300, _400); // 3, 7, 9
sampled = new byte[][] {
_100, _200, _300, _400, _400, _400, _400, _400, _400, _400
};
assertKeys(sampled, _400); // 3
}
private void assertKeys(byte[][] sampled, byte[]... expected) {
byte[][] keys = PartitionKeySampler.toPartitionKeys(sampled, 4);
assertEquals(expected.length, keys.length);
for (int i = 0; i < expected.length; i++) {
assertTrue(Arrays.equals(expected[i], keys[i]));
}
}
}