/*
* 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.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.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.type.Type;
import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.util.List;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.DATA;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.PRESENT;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.SECONDARY;
import static com.facebook.presto.orc.stream.MissingInputStreamSource.missingStreamSource;
import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;
public class TimestampStreamReader
implements StreamReader
{
private static final int MILLIS_PER_SECOND = 1000;
private final StreamDescriptor streamDescriptor;
private final long baseTimestampInSeconds;
private int readOffset;
private int nextBatchSize;
@Nonnull
private InputStreamSource<BooleanInputStream> presentStreamSource = missingStreamSource(BooleanInputStream.class);
@Nullable
private BooleanInputStream presentStream;
private boolean[] nullVector = new boolean[0];
@Nonnull
private InputStreamSource<LongInputStream> secondsStreamSource = missingStreamSource(LongInputStream.class);
@Nullable
private LongInputStream secondsStream;
@Nonnull
private InputStreamSource<LongInputStream> nanosStreamSource = missingStreamSource(LongInputStream.class);
@Nullable
private LongInputStream nanosStream;
private long[] secondsVector = new long[0];
private long[] nanosVector = new long[0];
private boolean rowGroupOpen;
public TimestampStreamReader(StreamDescriptor streamDescriptor, DateTimeZone hiveStorageTimeZone)
{
this.streamDescriptor = requireNonNull(streamDescriptor, "stream is null");
this.baseTimestampInSeconds = new DateTime(2015, 1, 1, 0, 0, requireNonNull(hiveStorageTimeZone, "hiveStorageTimeZone is null")).getMillis() / MILLIS_PER_SECOND;
}
@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 data reader
readOffset = presentStream.countBitsSet(readOffset);
}
if (readOffset > 0) {
if (secondsStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but seconds stream is not present");
}
if (nanosStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but nanos stream is not present");
}
secondsStream.skip(readOffset);
nanosStream.skip(readOffset);
}
}
if (secondsVector.length < nextBatchSize) {
secondsVector = new long[nextBatchSize];
}
if (nanosVector.length < nextBatchSize) {
nanosVector = new long[nextBatchSize];
}
BlockBuilder builder = type.createBlockBuilder(new BlockBuilderStatus(), nextBatchSize);
if (presentStream == null) {
if (secondsStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but seconds stream is not present");
}
if (nanosStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but nanos stream is not present");
}
secondsStream.nextLongVector(nextBatchSize, secondsVector);
nanosStream.nextLongVector(nextBatchSize, nanosVector);
// merge seconds and nanos together
for (int i = 0; i < nextBatchSize; i++) {
type.writeLong(builder, decodeTimestamp(secondsVector[i], nanosVector[i], baseTimestampInSeconds));
}
}
else {
if (nullVector.length < nextBatchSize) {
nullVector = new boolean[nextBatchSize];
}
int nullValues = presentStream.getUnsetBits(nextBatchSize, nullVector);
if (nullValues != nextBatchSize) {
if (secondsStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but seconds stream is not present");
}
if (nanosStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but nanos stream is not present");
}
secondsStream.nextLongVector(nextBatchSize, secondsVector, nullVector);
nanosStream.nextLongVector(nextBatchSize, nanosVector, nullVector);
// merge seconds and nanos together
for (int i = 0; i < nextBatchSize; i++) {
if (nullVector[i]) {
builder.appendNull();
}
else {
type.writeLong(builder, decodeTimestamp(secondsVector[i], nanosVector[i], baseTimestampInSeconds));
}
}
}
else {
for (int i = 0; i < nextBatchSize; i++) {
builder.appendNull();
}
}
}
readOffset = 0;
nextBatchSize = 0;
return builder.build();
}
private void openRowGroup()
throws IOException
{
presentStream = presentStreamSource.openStream();
secondsStream = secondsStreamSource.openStream();
nanosStream = nanosStreamSource.openStream();
rowGroupOpen = true;
}
@Override
public void startStripe(InputStreamSources dictionaryStreamSources, List<ColumnEncoding> encoding)
throws IOException
{
presentStreamSource = missingStreamSource(BooleanInputStream.class);
secondsStreamSource = missingStreamSource(LongInputStream.class);
nanosStreamSource = missingStreamSource(LongInputStream.class);
readOffset = 0;
nextBatchSize = 0;
presentStream = null;
secondsStream = null;
nanosStream = null;
rowGroupOpen = false;
}
@Override
public void startRowGroup(InputStreamSources dataStreamSources)
throws IOException
{
presentStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, PRESENT, BooleanInputStream.class);
secondsStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, DATA, LongInputStream.class);
nanosStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, SECONDARY, LongInputStream.class);
readOffset = 0;
nextBatchSize = 0;
presentStream = null;
secondsStream = null;
nanosStream = null;
rowGroupOpen = false;
}
@Override
public String toString()
{
return toStringHelper(this)
.addValue(streamDescriptor)
.toString();
}
// This comes from the Apache Hive ORC code
public static long decodeTimestamp(long seconds, long serializedNanos, long baseTimestampInSeconds)
{
long millis = (seconds + baseTimestampInSeconds) * MILLIS_PER_SECOND;
long nanos = parseNanos(serializedNanos);
// the rounding error exists because java always rounds up when dividing integers
// -42001/1000 = -42; and -42001 % 1000 = -1 (+ 1000)
// to get the correct value we need
// (-42 - 1)*1000 + 999 = -42001
// (42)*1000 + 1 = 42001
if (millis < 0 && nanos != 0) {
millis -= 1000;
}
// Truncate nanos to millis and add to mills
return millis + (nanos / 1_000_000);
}
// This comes from the Apache Hive ORC code
private static int parseNanos(long serialized)
{
int zeros = ((int) serialized) & 0b111;
int result = (int) (serialized >>> 3);
if (zeros != 0) {
for (int i = 0; i <= zeros; ++i) {
result *= 10;
}
}
return result;
}
}