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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
#ifndef ORC_COLUMN_WRITER_HH
#define ORC_COLUMN_WRITER_HH
#include "orc/Vector.hh"
#include "BloomFilter.hh"
#include "ByteRLE.hh"
#include "Compression.hh"
#include "orc/Exceptions.hh"
#include "Statistics.hh"
#include "wrap/orc-proto-wrapper.hh"
namespace orc {
class StreamsFactory {
public:
virtual ~StreamsFactory();
/**
* Get the stream for the given column/kind in this stripe.
* @param kind the kind of the stream
* @return the buffered output stream
*/
virtual std::unique_ptr<BufferedOutputStream>
createStream(proto::Stream_Kind kind) const = 0;
};
std::unique_ptr<StreamsFactory> createStreamsFactory(
const WriterOptions& options,
OutputStream * outStream);
/**
* record stream positions for row index
*/
class RowIndexPositionRecorder : public PositionRecorder {
public:
virtual ~RowIndexPositionRecorder() override;
RowIndexPositionRecorder(proto::RowIndexEntry& entry):
rowIndexEntry(entry) {}
virtual void add(uint64_t pos) override {
rowIndexEntry.add_positions(pos);
}
private:
proto::RowIndexEntry& rowIndexEntry;
};
/**
* The interface for writing ORC data types.
*/
class ColumnWriter {
protected:
std::unique_ptr<ByteRleEncoder> notNullEncoder;
uint64_t columnId;
std::unique_ptr<MutableColumnStatistics> colIndexStatistics;
std::unique_ptr<MutableColumnStatistics> colStripeStatistics;
std::unique_ptr<MutableColumnStatistics> colFileStatistics;
bool enableIndex;
// row index for this column, contains all RowIndexEntries in 1 stripe
std::unique_ptr<proto::RowIndex> rowIndex;
std::unique_ptr<proto::RowIndexEntry> rowIndexEntry;
std::unique_ptr<RowIndexPositionRecorder> rowIndexPosition;
// bloom filters are recorded per row group
bool enableBloomFilter;
std::unique_ptr<BloomFilterImpl> bloomFilter;
std::unique_ptr<proto::BloomFilterIndex> bloomFilterIndex;
public:
ColumnWriter(const Type& type, const StreamsFactory& factory,
const WriterOptions& options);
virtual ~ColumnWriter();
/**
* Write the next group of values from this rowBatch.
* @param rowBatch the row batch data to write
* @param offset the starting point of row batch to write
* @param numValues the number of values to write
* @param incomingMask if null, all values are not null. Otherwise, it is
* a mask (with at least numValues bytes) for which
* values to write.
*/
virtual void add(ColumnVectorBatch& rowBatch,
uint64_t offset,
uint64_t numValues,
const char * incomingMask);
/**
* Flush column writer output streams.
* @param streams vector to store streams generated by flush()
*/
virtual void flush(std::vector<proto::Stream>& streams);
/**
* Get estimated size of buffer used.
* @return estimated size of buffer used
*/
virtual uint64_t getEstimatedSize() const;
/**
* Get the encoding used by the writer for this column.
* @param encodings vector to store the returned ColumnEncoding info
*/
virtual void getColumnEncoding(
std::vector<proto::ColumnEncoding>& encodings) const = 0;
/**
* Get the stripe statistics for this column.
* @param stats vector to store the returned stripe statistics
*/
virtual void getStripeStatistics(
std::vector<proto::ColumnStatistics>& stats) const;
/**
* Get the file statistics for this column.
* @param stats vector to store the returned file statistics
*/
virtual void getFileStatistics(
std::vector<proto::ColumnStatistics>& stats) const;
/**
* Merge index stats into stripe stats and reset index stats.
*/
virtual void mergeRowGroupStatsIntoStripeStats();
/**
* Merge stripe stats into file stats and reset stripe stats.
*/
virtual void mergeStripeStatsIntoFileStats();
/**
* Create a row index entry with the previous location and the current
* index statistics. Also merges the index statistics into the stripe
* statistics before they are cleared. Finally, it records the start of the
* next index and ensures all of the children columns also create an entry.
*/
virtual void createRowIndexEntry();
/**
* Create a new BloomFilter entry and add the previous one to BloomFilterIndex
*/
virtual void addBloomFilterEntry();
/**
* Write row index streams for this column.
* @param streams output list of ROW_INDEX streams
*/
virtual void writeIndex(std::vector<proto::Stream> &streams) const;
/**
* Record positions for index.
*
* This function is called by createRowIndexEntry() and ColumnWriter's
* constructor. So base classes do not need to call inherited classes'
* recordPosition() function.
*/
virtual void recordPosition() const;
/**
* Reset positions for index.
*/
virtual void reset();
/**
* Write dictionary to streams for string columns
*/
virtual void writeDictionary();
protected:
/**
* Utility function to translate ColumnStatistics into protobuf form and
* add it to output list.
* @param statsList output list for protobuf stats
* @param stats ColumnStatistics to be transformed and added
*/
void getProtoBufStatistics(
std::vector<proto::ColumnStatistics>& statsList,
const MutableColumnStatistics* stats) const {
proto::ColumnStatistics pbStats;
stats->toProtoBuf(pbStats);
statsList.push_back(pbStats);
}
protected:
MemoryPool& memPool;
std::unique_ptr<BufferedOutputStream> indexStream;
std::unique_ptr<BufferedOutputStream> bloomFilterStream;
};
/**
* Create a writer for the given type.
*/
std::unique_ptr<ColumnWriter> buildWriter(
const Type& type,
const StreamsFactory& factory,
const WriterOptions& options);
}
#endif
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