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#pragma once
#include "clickhouse_config.h"
#if USE_ORC
#include <Processors/Formats/IInputFormat.h>
#include <Processors/Formats/ISchemaReader.h>
#include <Formats/FormatSettings.h>
#error #include <arrow/adapters/orc/adapter.h>
namespace arrow::adapters::orc
{
class ORCFileReader;
}
namespace DB
{
class ArrowColumnToCHColumn;
class ORCBlockInputFormat : public IInputFormat
{
public:
ORCBlockInputFormat(ReadBuffer & in_, Block header_, const FormatSettings & format_settings_);
String getName() const override { return "ORCBlockInputFormat"; }
void resetParser() override;
const BlockMissingValues & getMissingValues() const override;
size_t getApproxBytesReadForChunk() const override { return approx_bytes_read_for_chunk; }
protected:
Chunk generate() override;
void onCancel() override
{
is_stopped = 1;
}
private:
void prepareReader();
// TODO: check that this class implements every part of its parent
std::unique_ptr<arrow::adapters::orc::ORCFileReader> file_reader;
std::unique_ptr<ArrowColumnToCHColumn> arrow_column_to_ch_column;
// indices of columns to read from ORC file
std::vector<int> include_indices;
BlockMissingValues block_missing_values;
size_t approx_bytes_read_for_chunk = 0;
const FormatSettings format_settings;
const std::unordered_set<int> & skip_stripes;
int stripe_total = 0;
int stripe_current = 0;
std::atomic<int> is_stopped{0};
};
class ORCSchemaReader : public ISchemaReader
{
public:
ORCSchemaReader(ReadBuffer & in_, const FormatSettings & format_settings_);
NamesAndTypesList readSchema() override;
std::optional<size_t> readNumberOrRows() override;
private:
void initializeIfNeeded();
std::unique_ptr<arrow::adapters::orc::ORCFileReader> file_reader;
std::shared_ptr<arrow::Schema> schema;
const FormatSettings format_settings;
};
}
#endif
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