/*
* 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.serde;
import com.facebook.presto.block.BlockAssertions;
import com.facebook.presto.block.rle.RunLengthBlockEncoding;
import com.facebook.presto.block.rle.RunLengthEncodedBlock;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.block.BlockEncoding;
import com.facebook.presto.spi.block.VariableWidthBlockEncoding;
import io.airlift.slice.DynamicSliceOutput;
import io.airlift.slice.SliceInput;
import io.airlift.slice.Slices;
import org.testng.annotations.Test;
import static com.facebook.presto.spi.type.VarcharType.VARCHAR;
import static io.airlift.testing.Assertions.assertInstanceOf;
import static org.testng.Assert.assertEquals;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertTrue;
public class TestRunLengthEncodedBlockSerde
{
@Test
public void testRoundTrip()
{
Block value = VARCHAR.createBlockBuilder(new BlockBuilderStatus())
.appendSlice(Slices.utf8Slice("alice"))
.build();
RunLengthEncodedBlock expectedBlock = new RunLengthEncodedBlock(value, 11);
DynamicSliceOutput sliceOutput = new DynamicSliceOutput(1024);
RunLengthBlockEncoding blockEncoding = new RunLengthBlockEncoding(new VariableWidthBlockEncoding(VARCHAR));
blockEncoding.writeBlock(sliceOutput, expectedBlock);
RunLengthEncodedBlock actualBlock = blockEncoding.readBlock(sliceOutput.slice().getInput());
assertTrue(actualBlock.equalTo(0, expectedBlock, 0));
BlockAssertions.assertBlockEquals(actualBlock, expectedBlock);
}
@Test
public void testCreateBlockWriter()
{
Block expectedBlock = VARCHAR.createBlockBuilder(new BlockBuilderStatus())
.appendSlice(Slices.utf8Slice("alice"))
.appendSlice(Slices.utf8Slice("alice"))
.appendSlice(Slices.utf8Slice("bob"))
.appendSlice(Slices.utf8Slice("bob"))
.appendSlice(Slices.utf8Slice("bob"))
.appendSlice(Slices.utf8Slice("bob"))
.appendSlice(Slices.utf8Slice("charlie"))
.appendSlice(Slices.utf8Slice("charlie"))
.appendSlice(Slices.utf8Slice("charlie"))
.appendSlice(Slices.utf8Slice("charlie"))
.appendSlice(Slices.utf8Slice("charlie"))
.appendSlice(Slices.utf8Slice("charlie"))
.build();
DynamicSliceOutput sliceOutput = new DynamicSliceOutput(1024);
BlockEncoding blockEncoding = new RunLengthEncoder(sliceOutput).append(expectedBlock).finish();
SliceInput sliceInput = sliceOutput.slice().getInput();
Block block = blockEncoding.readBlock(sliceInput);
assertInstanceOf(block, RunLengthEncodedBlock.class);
RunLengthEncodedBlock rleBlock = (RunLengthEncodedBlock) block;
assertTrue(rleBlock.equalTo(0, expectedBlock, 0));
assertEquals(rleBlock.getPositionCount(), 2);
assertEquals(rleBlock.getSlice(0).toStringUtf8(), "alice");
block = blockEncoding.readBlock(sliceInput);
assertInstanceOf(block, RunLengthEncodedBlock.class);
rleBlock = (RunLengthEncodedBlock) block;
assertTrue(rleBlock.equalTo(0, expectedBlock, 2));
assertEquals(rleBlock.getPositionCount(), 4);
assertEquals(rleBlock.getSlice(0).toStringUtf8(), "bob");
block = blockEncoding.readBlock(sliceInput);
assertInstanceOf(block, RunLengthEncodedBlock.class);
rleBlock = (RunLengthEncodedBlock) block;
assertTrue(rleBlock.equalTo(0, expectedBlock, 6));
assertEquals(rleBlock.getPositionCount(), 6);
assertEquals(rleBlock.getSlice(0).toStringUtf8(), "charlie");
assertFalse(sliceInput.isReadable());
}
}