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67 lines
1.5 KiB
C++
67 lines
1.5 KiB
C++
#pragma once
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#include "config_formats.h"
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#if USE_PARQUET
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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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namespace parquet::arrow { class FileReader; }
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namespace arrow { class Buffer; }
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namespace DB
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{
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class ArrowColumnToCHColumn;
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class ParquetBlockInputFormat : public IInputFormat
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{
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public:
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ParquetBlockInputFormat(ReadBuffer & in_, Block header_, const FormatSettings & format_settings_);
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void resetParser() override;
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String getName() const override { return "ParquetBlockInputFormat"; }
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const BlockMissingValues & getMissingValues() const override;
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private:
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Chunk generate() override;
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void prepareReader();
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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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std::unique_ptr<parquet::arrow::FileReader> file_reader;
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int row_group_total = 0;
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int row_group_current = 0;
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// indices of columns to read from Parquet file
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std::vector<int> column_indices;
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std::unique_ptr<ArrowColumnToCHColumn> arrow_column_to_ch_column;
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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_row_groups;
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std::atomic<int> is_stopped{0};
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};
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class ParquetSchemaReader : public ISchemaReader
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{
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public:
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ParquetSchemaReader(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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