/*
* 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.hive.orc;
import com.facebook.presto.hive.HiveColumnHandle;
import com.facebook.presto.orc.OrcCorruptionException;
import com.facebook.presto.orc.OrcDataSource;
import com.facebook.presto.orc.OrcRecordReader;
import com.facebook.presto.orc.memory.AggregatedMemoryContext;
import com.facebook.presto.spi.ConnectorPageSource;
import com.facebook.presto.spi.Page;
import com.facebook.presto.spi.PrestoException;
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.LazyBlock;
import com.facebook.presto.spi.block.LazyBlockLoader;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.TypeManager;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.util.List;
import static com.facebook.presto.hive.HiveColumnHandle.ColumnType.REGULAR;
import static com.facebook.presto.hive.HiveErrorCode.HIVE_BAD_DATA;
import static com.facebook.presto.hive.HiveErrorCode.HIVE_CURSOR_ERROR;
import static com.facebook.presto.orc.OrcReader.MAX_BATCH_SIZE;
import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
public class OrcPageSource
implements ConnectorPageSource
{
private static final int NULL_ENTRY_SIZE = 0;
private final OrcRecordReader recordReader;
private final OrcDataSource orcDataSource;
private final List<String> columnNames;
private final List<Type> types;
private final Block[] constantBlocks;
private final int[] hiveColumnIndexes;
private int batchId;
private boolean closed;
private final AggregatedMemoryContext systemMemoryContext;
public OrcPageSource(
OrcRecordReader recordReader,
OrcDataSource orcDataSource,
List<HiveColumnHandle> columns,
TypeManager typeManager,
AggregatedMemoryContext systemMemoryContext)
{
this.recordReader = requireNonNull(recordReader, "recordReader is null");
this.orcDataSource = requireNonNull(orcDataSource, "orcDataSource is null");
int size = requireNonNull(columns, "columns is null").size();
this.constantBlocks = new Block[size];
this.hiveColumnIndexes = new int[size];
ImmutableList.Builder<String> namesBuilder = ImmutableList.builder();
ImmutableList.Builder<Type> typesBuilder = ImmutableList.builder();
for (int columnIndex = 0; columnIndex < columns.size(); columnIndex++) {
HiveColumnHandle column = columns.get(columnIndex);
checkState(column.getColumnType() == REGULAR, "column type must be regular");
String name = column.getName();
Type type = typeManager.getType(column.getTypeSignature());
namesBuilder.add(name);
typesBuilder.add(type);
hiveColumnIndexes[columnIndex] = column.getHiveColumnIndex();
if (!recordReader.isColumnPresent(column.getHiveColumnIndex())) {
BlockBuilder blockBuilder = type.createBlockBuilder(new BlockBuilderStatus(), MAX_BATCH_SIZE, NULL_ENTRY_SIZE);
for (int i = 0; i < MAX_BATCH_SIZE; i++) {
blockBuilder.appendNull();
}
constantBlocks[columnIndex] = blockBuilder.build();
}
}
types = typesBuilder.build();
columnNames = namesBuilder.build();
this.systemMemoryContext = requireNonNull(systemMemoryContext, "systemMemoryContext is null");
}
@Override
public long getTotalBytes()
{
return recordReader.getSplitLength();
}
@Override
public long getCompletedBytes()
{
return orcDataSource.getReadBytes();
}
@Override
public long getReadTimeNanos()
{
return orcDataSource.getReadTimeNanos();
}
@Override
public boolean isFinished()
{
return closed;
}
@Override
public Page getNextPage()
{
try {
batchId++;
int batchSize = recordReader.nextBatch();
if (batchSize <= 0) {
close();
return null;
}
Block[] blocks = new Block[hiveColumnIndexes.length];
for (int fieldId = 0; fieldId < blocks.length; fieldId++) {
Type type = types.get(fieldId);
if (constantBlocks[fieldId] != null) {
blocks[fieldId] = constantBlocks[fieldId].getRegion(0, batchSize);
}
else {
blocks[fieldId] = new LazyBlock(batchSize, new OrcBlockLoader(hiveColumnIndexes[fieldId], type));
}
}
return new Page(batchSize, blocks);
}
catch (PrestoException e) {
closeWithSuppression(e);
throw e;
}
catch (IOException | RuntimeException e) {
closeWithSuppression(e);
throw new PrestoException(HIVE_CURSOR_ERROR, e);
}
}
@Override
public void close()
{
// some hive input formats are broken and bad things can happen if you close them multiple times
if (closed) {
return;
}
closed = true;
try {
recordReader.close();
}
catch (IOException e) {
throw Throwables.propagate(e);
}
}
@Override
public String toString()
{
return toStringHelper(this)
.add("columnNames", columnNames)
.add("types", types)
.toString();
}
@Override
public long getSystemMemoryUsage()
{
return systemMemoryContext.getBytes();
}
protected void closeWithSuppression(Throwable throwable)
{
requireNonNull(throwable, "throwable is null");
try {
close();
}
catch (RuntimeException e) {
// Self-suppression not permitted
if (throwable != e) {
throwable.addSuppressed(e);
}
}
}
private final class OrcBlockLoader
implements LazyBlockLoader<LazyBlock>
{
private final int expectedBatchId = batchId;
private final int columnIndex;
private final Type type;
private boolean loaded;
public OrcBlockLoader(int columnIndex, Type type)
{
this.columnIndex = columnIndex;
this.type = requireNonNull(type, "type is null");
}
@Override
public final void load(LazyBlock lazyBlock)
{
if (loaded) {
return;
}
checkState(batchId == expectedBatchId);
try {
Block block = recordReader.readBlock(type, columnIndex);
lazyBlock.setBlock(block);
}
catch (IOException e) {
if (e instanceof OrcCorruptionException) {
throw new PrestoException(HIVE_BAD_DATA, e);
}
throw new PrestoException(HIVE_CURSOR_ERROR, e);
}
loaded = true;
}
}
}