/*
* 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.block.dictionary;
import com.facebook.presto.block.AbstractTestBlock;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.block.VariableWidthBlockBuilder;
import io.airlift.slice.Slice;
import org.testng.annotations.Test;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
public class TestDictionaryEncodedBlock
extends AbstractTestBlock
{
@Test
public void test()
{
Slice[] dictionary = createDictionary(10);
for (int positionCount = 0; positionCount < 20; positionCount++) {
Integer[] ids = createIds(dictionary.length, positionCount);
assertDictionaryEncodedBlock(dictionary, ids);
assertDictionaryEncodedBlock(dictionary, (Integer[]) alternatingNullValues(ids));
}
}
private static void assertDictionaryEncodedBlock(Slice[] dictionary, Integer[] ids)
{
VariableWidthBlockBuilder dictionaryBlockBuilder = new VariableWidthBlockBuilder(new BlockBuilderStatus());
for (Slice expectedValue : dictionary) {
dictionaryBlockBuilder.writeBytes(expectedValue, 0, expectedValue.length()).closeEntry();
}
Block dictionaryBlock = dictionaryBlockBuilder.build();
Slice[] expectedValues = new Slice[ids.length];
BlockBuilder idsBlockBuilder = BIGINT.createBlockBuilder(new BlockBuilderStatus());
for (int i = 0; i < ids.length; i++) {
Integer id = ids[i];
if (id == null) {
idsBlockBuilder.appendNull();
}
else {
BIGINT.writeLong(idsBlockBuilder, id);
expectedValues[i] = dictionary[id];
}
}
Block idsBlock = idsBlockBuilder.build();
assertBlock(new DictionaryEncodedBlock(dictionaryBlock, idsBlock), expectedValues);
}
private static Slice[] createDictionary(int size)
{
Slice[] expectedValues = new Slice[size];
for (int position = 0; position < size; position++) {
expectedValues[position] = createExpectedValue(position);
}
return expectedValues;
}
private static Integer[] createIds(int dictionarySize, int positionCount)
{
Integer[] ids = new Integer[positionCount];
for (int position = 0; position < positionCount; position++) {
ids[position] = positionCount % dictionarySize;
}
return ids;
}
}