/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.operation.projectors;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import io.crate.data.*;
import io.crate.metadata.Scalar;
import io.crate.operation.aggregation.FunctionExpression;
import io.crate.operation.collect.CollectExpression;
import io.crate.operation.collect.InputCollectExpression;
import io.crate.test.integration.CrateUnitTest;
import io.crate.testing.RowGenerator;
import io.crate.testing.TestingBatchConsumer;
import io.crate.testing.TestingBatchIterators;
import io.crate.testing.TestingHelpers;
import io.crate.types.DataTypes;
import org.junit.Test;
import java.util.Collections;
import java.util.List;
import java.util.stream.IntStream;
import static io.crate.testing.TestingHelpers.isRow;
import static org.hamcrest.Matchers.emptyIterable;
import static org.hamcrest.Matchers.is;
public class SimpleTopNProjectorTest extends CrateUnitTest {
private static final InputCollectExpression input = new InputCollectExpression(0);
private static final ImmutableList<Input<?>> INPUTS = ImmutableList.<Input<?>>of(input);
private static final List<CollectExpression<Row, ?>> COLLECT_EXPRESSIONS = Collections.<CollectExpression<Row, ?>>singletonList(input);
private TestingBatchConsumer consumer = new TestingBatchConsumer();
private SimpleTopNProjector prepareProjector(int limit, int offset) {
return new SimpleTopNProjector(INPUTS, COLLECT_EXPRESSIONS, limit, offset);
}
@Test
public void testProjectLimitOnly() throws Throwable {
Projector projector = prepareProjector(10, TopN.NO_OFFSET);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 12));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(10));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(10));
}
@Test
public void testProjectLimitOnlyLessThanLimit() throws Throwable {
Projector projector = prepareProjector(10, TopN.NO_OFFSET);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 5));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(5));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(5));
}
@Test
public void testProjectLimitOnlyExactlyLimit() throws Throwable {
Projector projector = prepareProjector(10, TopN.NO_OFFSET);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 10));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(10));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(10));
}
@Test
public void testProjectLimitOnly0() throws Throwable {
Projector projector = prepareProjector(10, TopN.NO_OFFSET);
consumer.accept(projector.apply(RowsBatchIterator.empty(1)), null);
Bucket projected = consumer.getBucket();
assertThat(projected, emptyIterable());
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(0));
}
@Test
public void testProjectLimitOnly1() throws Throwable {
Projector projector = prepareProjector(1, TopN.NO_OFFSET);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 10));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(1));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(1));
}
@Test
public void testProjectOffsetBigger0() throws Throwable {
Projector projector = prepareProjector(100, 10);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 100));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(90));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(90));
}
@Test
public void testNegativeOffset() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Invalid OFFSET");
new SimpleTopNProjector(INPUTS, COLLECT_EXPRESSIONS, 10, -10);
}
@Test
public void testNegativeLimit() {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Invalid LIMIT");
new SimpleTopNProjector(INPUTS, COLLECT_EXPRESSIONS, -100, TopN.NO_OFFSET);
}
@Test
public void testFunctionExpression() throws Throwable {
Scalar floor =
(Scalar) TestingHelpers.getFunctions().getBuiltin("floor", Collections.singletonList(DataTypes.DOUBLE));
FunctionExpression<Number, ?> funcExpr = new FunctionExpression<>(floor, new Input[]{input});
Projector projector = new SimpleTopNProjector(ImmutableList.<Input<?>>of(funcExpr), COLLECT_EXPRESSIONS, 10, TopN.NO_OFFSET);
Iterable<Row> rows = RowGenerator.fromSingleColValues(
() -> IntStream.range(0, 12).mapToDouble(i -> 42.3d).iterator());
BatchIterator batchIterator = projector.apply(RowsBatchIterator.newInstance(rows, 1));
consumer.accept(batchIterator, null);
Bucket result = consumer.getBucket();
assertThat(result.size(), is(10));
assertThat(result.iterator().next(), isRow(42L));
}
@Test
public void testProjectLimitOnlyUpStream() throws Throwable {
Projector projector = prepareProjector(10, TopN.NO_OFFSET);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 12));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(10));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(10));
}
@Test
public void testProjectLimitLessThanLimitUpStream() throws Throwable {
Projector projector = prepareProjector(10, TopN.NO_OFFSET);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 5));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(5));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(5));
}
@Test
public void testProjectLimitOnly0UpStream() throws Throwable {
Projector projector = prepareProjector(10, TopN.NO_OFFSET);
consumer.accept(projector.apply(RowsBatchIterator.empty(1)), null);
Bucket projected = consumer.getBucket();
assertThat(projected, emptyIterable());
}
@Test
public void testProjectOffsetBigger0UpStream() throws Throwable {
Projector projector = prepareProjector(100, 10);
BatchIterator batchIterator = projector.apply(TestingBatchIterators.range(0, 100));
consumer.accept(batchIterator, null);
Bucket projected = consumer.getBucket();
assertThat(projected.size(), is(90));
int iterateLength = Iterables.size(consumer.getBucket());
assertThat(iterateLength, is(90));
}
@Test
public void testProjectNoLimitNoOffset() throws Throwable {
expectedException.expect(IllegalArgumentException.class);
expectedException.expectMessage("Invalid LIMIT");
prepareProjector(TopN.NO_LIMIT, TopN.NO_OFFSET);
}
}