/*
* 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.orc.reader;
import com.facebook.presto.orc.OrcCorruptionException;
import com.facebook.presto.orc.StreamDescriptor;
import com.facebook.presto.orc.metadata.ColumnEncoding;
import com.facebook.presto.orc.stream.BooleanInputStream;
import com.facebook.presto.orc.stream.ByteArrayInputStream;
import com.facebook.presto.orc.stream.InputStreamSource;
import com.facebook.presto.orc.stream.InputStreamSources;
import com.facebook.presto.orc.stream.LongInputStream;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.SliceArrayBlock;
import com.facebook.presto.spi.type.Type;
import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.DATA;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.LENGTH;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.PRESENT;
import static com.facebook.presto.orc.stream.MissingInputStreamSource.missingStreamSource;
import static com.facebook.presto.spi.type.Chars.isCharType;
import static com.facebook.presto.spi.type.Chars.trimSpacesAndTruncateToLength;
import static com.facebook.presto.spi.type.Varchars.isVarcharType;
import static com.facebook.presto.spi.type.Varchars.truncateToLength;
import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;
public class SliceDirectStreamReader
implements StreamReader
{
private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
private final StreamDescriptor streamDescriptor;
private int readOffset;
private int nextBatchSize;
@Nonnull
private InputStreamSource<BooleanInputStream> presentStreamSource = missingStreamSource(BooleanInputStream.class);
@Nullable
private BooleanInputStream presentStream;
private boolean[] isNullVector = new boolean[0];
@Nonnull
private InputStreamSource<LongInputStream> lengthStreamSource = missingStreamSource(LongInputStream.class);
@Nullable
private LongInputStream lengthStream;
private int[] lengthVector = new int[0];
@Nonnull
private InputStreamSource<ByteArrayInputStream> dataByteSource = missingStreamSource(ByteArrayInputStream.class);
@Nullable
private ByteArrayInputStream dataStream;
private boolean rowGroupOpen;
public SliceDirectStreamReader(StreamDescriptor streamDescriptor)
{
this.streamDescriptor = requireNonNull(streamDescriptor, "stream is null");
}
@Override
public void prepareNextRead(int batchSize)
{
readOffset += nextBatchSize;
nextBatchSize = batchSize;
}
@Override
public Block readBlock(Type type)
throws IOException
{
if (!rowGroupOpen) {
openRowGroup();
}
if (readOffset > 0) {
if (presentStream != null) {
// skip ahead the present bit reader, but count the set bits
// and use this as the skip size for the length reader
readOffset = presentStream.countBitsSet(readOffset);
}
if (readOffset > 0) {
if (lengthStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but length stream is not present");
}
long dataSkipSize = lengthStream.sum(readOffset);
if (dataSkipSize > 0) {
if (dataStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but data stream is not present");
}
dataStream.skip(dataSkipSize);
}
}
}
if (isNullVector.length < nextBatchSize) {
isNullVector = new boolean[nextBatchSize];
}
if (lengthVector.length < nextBatchSize) {
lengthVector = new int[nextBatchSize];
}
if (presentStream == null) {
if (lengthStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but length stream is not present");
}
Arrays.fill(isNullVector, false);
lengthStream.nextIntVector(nextBatchSize, lengthVector);
}
else {
int nullValues = presentStream.getUnsetBits(nextBatchSize, isNullVector);
if (nullValues != nextBatchSize) {
if (lengthStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but length stream is not present");
}
lengthStream.nextIntVector(nextBatchSize, lengthVector, isNullVector);
}
}
int totalLength = 0;
for (int i = 0; i < nextBatchSize; i++) {
if (!isNullVector[i]) {
totalLength += lengthVector[i];
}
}
byte[] data = EMPTY_BYTE_ARRAY;
if (totalLength > 0) {
if (dataStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but data stream is not present");
}
data = dataStream.next(totalLength);
}
Slice[] sliceVector = new Slice[nextBatchSize];
int offset = 0;
for (int i = 0; i < nextBatchSize; i++) {
if (!isNullVector[i]) {
int length = lengthVector[i];
Slice value = Slices.wrappedBuffer(data, offset, length);
if (isVarcharType(type)) {
value = truncateToLength(value, type);
}
if (isCharType(type)) {
value = trimSpacesAndTruncateToLength(value, type);
}
sliceVector[i] = value;
offset += length;
}
}
readOffset = 0;
nextBatchSize = 0;
return new SliceArrayBlock(sliceVector.length, sliceVector);
}
private void openRowGroup()
throws IOException
{
presentStream = presentStreamSource.openStream();
lengthStream = lengthStreamSource.openStream();
dataStream = dataByteSource.openStream();
rowGroupOpen = true;
}
@Override
public void startStripe(InputStreamSources dictionaryStreamSources, List<ColumnEncoding> encoding)
throws IOException
{
presentStreamSource = missingStreamSource(BooleanInputStream.class);
lengthStreamSource = missingStreamSource(LongInputStream.class);
dataByteSource = missingStreamSource(ByteArrayInputStream.class);
readOffset = 0;
nextBatchSize = 0;
Arrays.fill(isNullVector, false);
presentStream = null;
lengthStream = null;
dataStream = null;
rowGroupOpen = false;
}
@Override
public void startRowGroup(InputStreamSources dataStreamSources)
throws IOException
{
presentStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, PRESENT, BooleanInputStream.class);
lengthStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, LENGTH, LongInputStream.class);
dataByteSource = dataStreamSources.getInputStreamSource(streamDescriptor, DATA, ByteArrayInputStream.class);
readOffset = 0;
nextBatchSize = 0;
Arrays.fill(isNullVector, false);
presentStream = null;
lengthStream = null;
dataStream = null;
rowGroupOpen = false;
}
@Override
public String toString()
{
return toStringHelper(this)
.addValue(streamDescriptor)
.toString();
}
}