io.prestosql.parquet.writer.StructColumnWriter Maven / Gradle / Ivy
/*
* 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 io.prestosql.parquet.writer;
import com.google.common.collect.ImmutableList;
import io.prestosql.parquet.writer.repdef.DefLevelIterable;
import io.prestosql.parquet.writer.repdef.DefLevelIterables;
import io.prestosql.parquet.writer.repdef.RepLevelIterable;
import io.prestosql.parquet.writer.repdef.RepLevelIterables;
import io.prestosql.spi.block.Block;
import io.prestosql.spi.block.ColumnarRow;
import org.openjdk.jol.info.ClassLayout;
import java.io.IOException;
import java.util.List;
import static io.prestosql.spi.block.ColumnarRow.toColumnarRow;
import static java.util.Objects.requireNonNull;
import static org.apache.parquet.Preconditions.checkArgument;
public class StructColumnWriter
implements ColumnWriter
{
private static final int INSTANCE_SIZE = ClassLayout.parseClass(StructColumnWriter.class).instanceSize();
private final List columnWriters;
private final int maxDefinitionLevel;
private final int maxRepetitionLevel;
public StructColumnWriter(List columnWriters, int maxDefinitionLevel, int maxRepetitionLevel)
{
this.columnWriters = requireNonNull(columnWriters, "columnWriters is null");
this.maxDefinitionLevel = maxDefinitionLevel;
this.maxRepetitionLevel = maxRepetitionLevel;
}
@Override
public void writeBlock(ColumnChunk columnChunk)
throws IOException
{
ColumnarRow columnarRow = toColumnarRow(columnChunk.getBlock());
checkArgument(columnarRow.getFieldCount() == columnWriters.size(), "ColumnarRow field size %s is not equal to columnWriters size %s", columnarRow.getFieldCount(), columnWriters.size());
List defLevelIterables = ImmutableList.builder()
.addAll(columnChunk.getDefLevelIterables())
.add(DefLevelIterables.of(columnarRow, maxDefinitionLevel))
.build();
List repLevelIterables = ImmutableList.builder()
.addAll(columnChunk.getRepLevelIterables())
.add(RepLevelIterables.of(columnChunk.getBlock()))
.build();
for (int i = 0; i < columnWriters.size(); ++i) {
ColumnWriter columnWriter = columnWriters.get(i);
Block block = columnarRow.getField(i);
columnWriter.writeBlock(new ColumnChunk(block, defLevelIterables, repLevelIterables));
}
}
@Override
public void close()
{
columnWriters.forEach(ColumnWriter::close);
}
@Override
public List getBuffer()
throws IOException
{
ImmutableList.Builder builder = ImmutableList.builder();
for (ColumnWriter columnWriter : columnWriters) {
builder.addAll(columnWriter.getBuffer());
}
return builder.build();
}
@Override
public long getBufferedBytes()
{
return columnWriters.stream().mapToLong(ColumnWriter::getBufferedBytes).sum();
}
@Override
public long getRetainedBytes()
{
return INSTANCE_SIZE +
columnWriters.stream().mapToLong(ColumnWriter::getRetainedBytes).sum();
}
@Override
public void reset()
{
columnWriters.forEach(ColumnWriter::reset);
}
}
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