/*
* Licensed 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 com.facebook.presto.operator;
import com.facebook.presto.RowPagesBuilder;
import com.facebook.presto.memory.AggregatedMemoryContext;
import com.facebook.presto.memory.LocalMemoryContext;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.type.Type;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import org.testng.annotations.Test;
import java.util.Iterator;
import java.util.List;
import static com.facebook.presto.RowPagesBuilder.rowPagesBuilder;
import static com.facebook.presto.operator.PageAssertions.assertPageEquals;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;
public class TestMergeHashSort
{
@Test
public void testChannelIterator()
{
RowPagesBuilder pageBuilder = rowPagesBuilder(BIGINT);
pageBuilder.addSequencePage(2, 2);
pageBuilder.addSequencePage(2, 10);
MergeHashSort.PagePositions iterator = new MergeHashSort.SingleChannelPagePositions(pageBuilder.build().iterator(), aMemoryContext());
assertTrue(iterator.hasNext());
assertEquals(iterator.next().getPosition(), 0);
assertTrue(iterator.hasNext());
assertEquals(iterator.next().getPosition(), 1);
assertTrue(iterator.hasNext());
assertEquals(iterator.next().getPosition(), 0);
assertTrue(iterator.hasNext());
assertEquals(iterator.next().getPosition(), 1);
assertFalse(iterator.hasNext());
}
private LocalMemoryContext aMemoryContext()
{
return new AggregatedMemoryContext().newLocalMemoryContext();
}
@Test
public void testBinaryMergeIteratorOverEmptyPage()
{
Page emptyPage = new Page(0, BIGINT.createFixedSizeBlockBuilder(0).build());
Iterator<Page> mergedPage = new MergeHashSort(new AggregatedMemoryContext()).merge(
ImmutableList.of(BIGINT),
ImmutableList.of(BIGINT),
ImmutableList.of(ImmutableList.of(emptyPage).iterator()));
assertTrue(mergedPage.hasNext());
Page actualPage = mergedPage.next();
assertEquals(actualPage.getPositionCount(), 0);
assertFalse(mergedPage.hasNext());
}
@Test
public void testBinaryMergeIteratorOverEmptyPageAndNonEmptyPage()
{
Page emptyPage = new Page(0, BIGINT.createFixedSizeBlockBuilder(0).build());
Page page = rowPagesBuilder(BIGINT).row(42).build().get(0);
Iterator<Page> mergedPage = new MergeHashSort(new AggregatedMemoryContext()).merge(
ImmutableList.of(BIGINT),
ImmutableList.of(BIGINT),
ImmutableList.of(ImmutableList.of(emptyPage, page).iterator()));
assertTrue(mergedPage.hasNext());
Page actualPage = mergedPage.next();
assertEquals(actualPage.getPositionCount(), 1);
assertEquals(actualPage.getChannelCount(), 1);
assertEquals(actualPage.getBlock(0).getLong(0, 0), 42);
assertFalse(mergedPage.hasNext());
}
@Test
public void testPageRewriteIterator()
{
ImmutableList<Type> types = ImmutableList.of(BIGINT, BIGINT);
RowPagesBuilder pagesBuilder = rowPagesBuilder(types);
pagesBuilder.row(0, 42);
pagesBuilder.row(0, 43);
pagesBuilder.pageBreak();
pagesBuilder.row(0, 44);
pagesBuilder.row(1, 45);
pagesBuilder.pageBreak();
pagesBuilder.row(2, 46);
Iterator<Page> rewriterIterator = new MergeHashSort.PageRewriteIterator(
new InterpretedHashGenerator(ImmutableList.of(BIGINT), new int[] {0}),
types,
new MergeHashSort.SingleChannelPagePositions(pagesBuilder.build().iterator(), aMemoryContext()),
aMemoryContext());
List<Page> pages = Lists.newArrayList(rewriterIterator);
assertEquals(pages.size(), 1);
List<Page> expectedPages = rowPagesBuilder(types)
.row(0, 42)
.row(0, 43)
.row(0, 44)
.row(1, 45)
.row(2, 46)
.build();
assertPageEquals(types, pages.get(0), expectedPages.get(0));
}
}