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103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
#include "ParquetBlockOutputFormat.h"
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#if USE_PARQUET
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#include <Formats/FormatFactory.h>
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#include <parquet/arrow/writer.h>
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#include "ArrowBufferedStreams.h"
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#include "CHColumnToArrowColumn.h"
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int UNKNOWN_EXCEPTION;
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}
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ParquetBlockOutputFormat::ParquetBlockOutputFormat(WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings_)
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: IOutputFormat(header_, out_), format_settings{format_settings_}
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{
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}
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void ParquetBlockOutputFormat::consume(Chunk chunk)
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{
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const size_t columns_num = chunk.getNumColumns();
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std::shared_ptr<arrow::Table> arrow_table;
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if (!ch_column_to_arrow_column)
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{
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const Block & header = getPort(PortKind::Main).getHeader();
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ch_column_to_arrow_column = std::make_unique<CHColumnToArrowColumn>(header, "Parquet", false);
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}
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ch_column_to_arrow_column->chChunkToArrowTable(arrow_table, chunk, columns_num);
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if (!file_writer)
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{
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auto sink = std::make_shared<ArrowBufferedOutputStream>(out);
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parquet::WriterProperties::Builder builder;
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#if USE_SNAPPY
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builder.compression(parquet::Compression::SNAPPY);
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#endif
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auto props = builder.build();
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auto status = parquet::arrow::FileWriter::Open(
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*arrow_table->schema(),
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arrow::default_memory_pool(),
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sink,
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props, /*parquet::default_writer_properties(),*/
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&file_writer);
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if (!status.ok())
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throw Exception{"Error while opening a table: " + status.ToString(), ErrorCodes::UNKNOWN_EXCEPTION};
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}
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// TODO: calculate row_group_size depending on a number of rows and table size
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auto status = file_writer->WriteTable(*arrow_table, format_settings.parquet.row_group_size);
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if (!status.ok())
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throw Exception{"Error while writing a table: " + status.ToString(), ErrorCodes::UNKNOWN_EXCEPTION};
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}
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void ParquetBlockOutputFormat::finalize()
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{
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if (!file_writer)
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{
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const Block & header = getPort(PortKind::Main).getHeader();
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consume(Chunk(header.getColumns(), 0));
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}
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auto status = file_writer->Close();
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if (!status.ok())
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throw Exception{"Error while closing a table: " + status.ToString(), ErrorCodes::UNKNOWN_EXCEPTION};
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}
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void registerOutputFormatParquet(FormatFactory & factory)
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{
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factory.registerOutputFormat(
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"Parquet",
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[](WriteBuffer & buf,
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const Block & sample,
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const RowOutputFormatParams &,
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const FormatSettings & format_settings)
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{
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return std::make_shared<ParquetBlockOutputFormat>(buf, sample, format_settings);
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});
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}
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}
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#else
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namespace DB
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{
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class FormatFactory;
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void registerOutputFormatParquet(FormatFactory &)
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{
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}
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}
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#endif
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