ClickHouse/src/Processors/Formats/Impl/ORCBlockInputFormat.cpp

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#include "ORCBlockInputFormat.h"
#include <boost/algorithm/string/case_conv.hpp>
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#if USE_ORC
#include <Formats/FormatFactory.h>
#include <IO/ReadBufferFromMemory.h>
#include <IO/WriteHelpers.h>
#include <IO/copyData.h>
#include "ArrowBufferedStreams.h"
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#include "ArrowColumnToCHColumn.h"
#include <DataTypes/NestedUtils.h>
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namespace DB
{
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namespace ErrorCodes
{
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extern const int BAD_ARGUMENTS;
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extern const int CANNOT_READ_ALL_DATA;
}
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ORCBlockInputFormat::ORCBlockInputFormat(ReadBuffer & in_, Block header_, const FormatSettings & format_settings_)
: IInputFormat(std::move(header_), in_), format_settings(format_settings_)
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{
}
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Chunk ORCBlockInputFormat::generate()
{
Chunk res;
block_missing_values.clear();
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if (!file_reader)
prepareReader();
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if (is_stopped)
return {};
std::shared_ptr<arrow::RecordBatchReader> batch_reader;
auto result = file_reader->NextStripeReader(format_settings.orc.row_batch_size, include_indices);
if (!result.ok())
throw ParsingException(ErrorCodes::CANNOT_READ_ALL_DATA, "Failed to create batch reader: {}", result.status().ToString());
batch_reader = std::move(result).ValueOrDie();
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if (!batch_reader)
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{
return res;
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}
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std::shared_ptr<arrow::Table> table;
arrow::Status table_status = batch_reader->ReadAll(&table);
if (!table_status.ok())
throw ParsingException(ErrorCodes::CANNOT_READ_ALL_DATA, "Error while reading batch of ORC data: {}", table_status.ToString());
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if (!table || !table->num_rows())
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return res;
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if (format_settings.use_lowercase_column_name)
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table = *table->RenameColumns(include_column_names);
arrow_column_to_ch_column->arrowTableToCHChunk(res, table);
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/// If defaults_for_omitted_fields is true, calculate the default values from default expression for omitted fields.
/// Otherwise fill the missing columns with zero values of its type.
if (format_settings.defaults_for_omitted_fields)
for (size_t row_idx = 0; row_idx < res.getNumRows(); ++row_idx)
for (const auto & column_idx : missing_columns)
block_missing_values.setBit(column_idx, row_idx);
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return res;
}
void ORCBlockInputFormat::resetParser()
{
IInputFormat::resetParser();
file_reader.reset();
include_indices.clear();
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include_column_names.clear();
block_missing_values.clear();
}
const BlockMissingValues & ORCBlockInputFormat::getMissingValues() const
{
return block_missing_values;
}
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static size_t countIndicesForType(std::shared_ptr<arrow::DataType> type)
{
if (type->id() == arrow::Type::LIST)
return countIndicesForType(static_cast<arrow::ListType *>(type.get())->value_type()) + 1;
if (type->id() == arrow::Type::STRUCT)
{
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int indices = 1;
auto * struct_type = static_cast<arrow::StructType *>(type.get());
for (int i = 0; i != struct_type->num_fields(); ++i)
indices += countIndicesForType(struct_type->field(i)->type());
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return indices;
}
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if (type->id() == arrow::Type::MAP)
{
auto * map_type = static_cast<arrow::MapType *>(type.get());
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return countIndicesForType(map_type->key_type()) + countIndicesForType(map_type->item_type());
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}
return 1;
}
static void getFileReaderAndSchema(
ReadBuffer & in,
std::unique_ptr<arrow::adapters::orc::ORCFileReader> & file_reader,
std::shared_ptr<arrow::Schema> & schema,
const FormatSettings & format_settings,
std::atomic<int> & is_stopped)
{
auto arrow_file = asArrowFile(in, format_settings, is_stopped);
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if (is_stopped)
return;
auto result = arrow::adapters::orc::ORCFileReader::Open(arrow_file, arrow::default_memory_pool());
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if (!result.ok())
throw Exception(result.status().ToString(), ErrorCodes::BAD_ARGUMENTS);
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file_reader = std::move(result).ValueOrDie();
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auto read_schema_result = file_reader->ReadSchema();
if (!read_schema_result.ok())
throw Exception(read_schema_result.status().ToString(), ErrorCodes::BAD_ARGUMENTS);
schema = std::move(read_schema_result).ValueOrDie();
if (format_settings.use_lowercase_column_name)
{
std::vector<std::shared_ptr<::arrow::Field>> fields;
fields.reserve(schema->num_fields());
for (int i = 0; i < schema->num_fields(); ++i)
{
const auto& field = schema->field(i);
auto name = field->name();
boost::to_lower(name);
fields.push_back(field->WithName(name));
}
schema = arrow::schema(fields, schema->metadata());
}
}
void ORCBlockInputFormat::prepareReader()
{
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std::shared_ptr<arrow::Schema> schema;
getFileReaderAndSchema(*in, file_reader, schema, format_settings, is_stopped);
if (is_stopped)
return;
arrow_column_to_ch_column = std::make_unique<ArrowColumnToCHColumn>(
getPort().getHeader(), "ORC", format_settings.orc.import_nested, format_settings.orc.allow_missing_columns);
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missing_columns = arrow_column_to_ch_column->getMissingColumns(*schema);
std::unordered_set<String> nested_table_names;
if (format_settings.orc.import_nested)
nested_table_names = Nested::getAllTableNames(getPort().getHeader());
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/// In ReadStripe column indices should be started from 1,
/// because 0 indicates to select all columns.
int index = 1;
for (int i = 0; i < schema->num_fields(); ++i)
{
/// LIST type require 2 indices, STRUCT - the number of elements + 1,
/// so we should recursively count the number of indices we need for this type.
int indexes_count = countIndicesForType(schema->field(i)->type());
const auto & name = schema->field(i)->name();
if (getPort().getHeader().has(name) || nested_table_names.contains(name))
{
for (int j = 0; j != indexes_count; ++j)
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{
include_indices.push_back(index + j);
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include_column_names.push_back(name);
}
}
index += indexes_count;
}
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}
ORCSchemaReader::ORCSchemaReader(ReadBuffer & in_, const FormatSettings & format_settings_) : ISchemaReader(in_), format_settings(format_settings_)
{
}
NamesAndTypesList ORCSchemaReader::readSchema()
{
std::unique_ptr<arrow::adapters::orc::ORCFileReader> file_reader;
std::shared_ptr<arrow::Schema> schema;
std::atomic<int> is_stopped = 0;
getFileReaderAndSchema(in, file_reader, schema, format_settings, is_stopped);
auto header = ArrowColumnToCHColumn::arrowSchemaToCHHeader(*schema, "ORC");
return header.getNamesAndTypesList();
}
void registerInputFormatORC(FormatFactory & factory)
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{
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factory.registerInputFormat(
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"ORC",
[](ReadBuffer &buf,
const Block &sample,
const RowInputFormatParams &,
const FormatSettings & settings)
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{
return std::make_shared<ORCBlockInputFormat>(buf, sample, settings);
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});
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factory.markFormatAsColumnOriented("ORC");
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}
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void registerORCSchemaReader(FormatFactory & factory)
{
factory.registerSchemaReader(
"ORC",
[](ReadBuffer & buf, const FormatSettings & settings, ContextPtr)
{
return std::make_shared<ORCSchemaReader>(buf, settings);
}
);
}
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}
#else
namespace DB
{
class FormatFactory;
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void registerInputFormatORC(FormatFactory &)
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{
}
void registerORCSchemaReader(FormatFactory &)
{
}
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}
#endif