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