| /* |
| * 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.datasketches.hive.quantiles; |
| |
| import java.util.Comparator; |
| import java.util.List; |
| |
| import org.apache.hadoop.io.BytesWritable; |
| import org.testng.Assert; |
| import org.testng.annotations.Test; |
| |
| import org.apache.datasketches.ArrayOfItemsSerDe; |
| import org.apache.datasketches.ArrayOfLongsSerDe; |
| import org.apache.datasketches.ArrayOfStringsSerDe; |
| import org.apache.datasketches.SketchesArgumentException; |
| import org.apache.datasketches.quantiles.ItemsSketch; |
| |
| @SuppressWarnings("javadoc") |
| public class GetQuantilesFromStringsSketchUDFTest { |
| |
| static final Comparator<String> comparator = Comparator.naturalOrder(); |
| static final ArrayOfItemsSerDe<String> serDe = new ArrayOfStringsSerDe(); |
| |
| @Test |
| public void nullSketch() { |
| List<String> result = new GetQuantilesFromStringsSketchUDF().evaluate(null, 0.0); |
| Assert.assertNull(result); |
| } |
| |
| @Test |
| public void emptyListOfFractions() { |
| ItemsSketch<String> sketch = ItemsSketch.getInstance(comparator); |
| sketch.update("a"); |
| sketch.update("b"); |
| sketch.update("c"); |
| List<String> result = new GetQuantilesFromStringsSketchUDF().evaluate(new BytesWritable(sketch.toByteArray(serDe))); |
| Assert.assertNotNull(result); |
| Assert.assertEquals(result.size(), 0); |
| } |
| |
| @Test |
| public void fractionsNormalCase() { |
| ItemsSketch<String> sketch = ItemsSketch.getInstance(comparator); |
| sketch.update("a"); |
| sketch.update("b"); |
| sketch.update("c"); |
| List<String> result = new GetQuantilesFromStringsSketchUDF().evaluate(new BytesWritable(sketch.toByteArray(serDe)), 0.0, 0.5, 1.0); |
| Assert.assertNotNull(result); |
| Assert.assertEquals(result.size(), 3); |
| Assert.assertEquals(result.get(0), "a"); |
| Assert.assertEquals(result.get(1), "b"); |
| Assert.assertEquals(result.get(2), "c"); |
| } |
| |
| @Test(expectedExceptions = SketchesArgumentException.class) |
| public void evenlySpacedZero() { |
| ItemsSketch<String> sketch = ItemsSketch.getInstance(comparator); |
| sketch.update("a"); |
| new GetQuantilesFromStringsSketchUDF() |
| .evaluate(new BytesWritable(sketch.toByteArray(serDe)), 0); |
| } |
| |
| @Test |
| public void evenlySpacedEmptySketch() { |
| ItemsSketch<String> sketch = ItemsSketch.getInstance(comparator); |
| List<String> result = new GetQuantilesFromStringsSketchUDF().evaluate(new BytesWritable(sketch.toByteArray(serDe)), 1); |
| Assert.assertNull(result); |
| } |
| |
| @Test |
| public void evenlySpacedNormalCase() { |
| ItemsSketch<String> sketch = ItemsSketch.getInstance(comparator); |
| sketch.update("a"); |
| sketch.update("b"); |
| sketch.update("c"); |
| List<String> result = new GetQuantilesFromStringsSketchUDF().evaluate(new BytesWritable(sketch.toByteArray(serDe)), 3); |
| Assert.assertNotNull(result); |
| Assert.assertEquals(result.size(), 3); |
| Assert.assertEquals(result.get(0), "a"); |
| Assert.assertEquals(result.get(1), "b"); |
| Assert.assertEquals(result.get(2), "c"); |
| } |
| |
| //Note: this exception is only caught because a bounds error was detected. |
| //If a bounds error is not detected from a wrong type assignment, unexpected results could occur. |
| @Test(expectedExceptions = IllegalArgumentException.class) |
| public void fractionsWrongSketchType() { |
| ItemsSketch<Long> sketch = ItemsSketch.getInstance(Comparator.naturalOrder()); |
| sketch.update(1L); |
| sketch.update(2L); |
| sketch.update(3L); |
| new GetQuantilesFromStringsSketchUDF() //WRONG SKETCH |
| .evaluate(new BytesWritable(sketch.toByteArray(new ArrayOfLongsSerDe())), 0.5); |
| } |
| |
| //Note: this exception is only caught because a bounds error was detected. |
| //If a bounds error is not detected from a wrong type assignment, unexpected results could occur. |
| @Test(expectedExceptions = IllegalArgumentException.class) |
| public void evenlySpacedWrongSketchType() { |
| ItemsSketch<Long> sketch = ItemsSketch.getInstance(Comparator.naturalOrder()); |
| sketch.update(1L); |
| sketch.update(2L); |
| sketch.update(3L); |
| new GetQuantilesFromStringsSketchUDF() //WRONG SKETCH |
| .evaluate(new BytesWritable(sketch.toByteArray(new ArrayOfLongsSerDe())), 1); |
| } |
| |
| } |