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#include "DictionarySource.h"
#include <Dictionaries/DictionaryHelpers.h>
#include <Processors/ISource.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int NO_SUCH_COLUMN_IN_TABLE;
}
class DictionarySource : public ISource
{
public:
explicit DictionarySource(std::shared_ptr<DictionarySourceCoordinator> coordinator_)
: ISource(coordinator_->getHeader()), coordinator(std::move(coordinator_))
{
}
private:
String getName() const override { return "DictionarySource"; }
Chunk generate() override
{
ColumnsWithTypeAndName key_columns_to_read;
ColumnsWithTypeAndName data_columns;
if (!coordinator->getKeyColumnsNextRangeToRead(key_columns_to_read, data_columns))
return {};
const auto & header = coordinator->getHeader();
std::vector<ColumnPtr> key_columns;
std::vector<DataTypePtr> key_types;
key_columns.reserve(key_columns_to_read.size());
key_types.reserve(key_columns_to_read.size());
std::unordered_map<std::string_view, ColumnPtr> name_to_column;
for (const auto & key_column_to_read : key_columns_to_read)
{
key_columns.emplace_back(key_column_to_read.column);
key_types.emplace_back(key_column_to_read.type);
if (header.has(key_column_to_read.name))
name_to_column.emplace(key_column_to_read.name, key_column_to_read.column);
}
for (const auto & data_column : data_columns)
{
if (header.has(data_column.name))
name_to_column.emplace(data_column.name, data_column.column);
}
const auto & attributes_names_to_read = coordinator->getAttributesNamesToRead();
const auto & attributes_types_to_read = coordinator->getAttributesTypesToRead();
const auto & attributes_default_values_columns = coordinator->getAttributesDefaultValuesColumns();
const auto & read_columns_func = coordinator->getReadColumnsFunc();
auto attributes_columns = read_columns_func(
attributes_names_to_read,
attributes_types_to_read,
key_columns,
key_types,
attributes_default_values_columns);
for (size_t i = 0; i < attributes_names_to_read.size(); ++i)
{
const auto & attribute_name = attributes_names_to_read[i];
name_to_column.emplace(attribute_name, attributes_columns[i]);
}
std::vector<ColumnPtr> result_columns;
result_columns.reserve(header.columns());
for (const auto & column_with_type : header)
{
const auto & header_name = column_with_type.name;
auto it = name_to_column.find(header_name);
if (it == name_to_column.end())
throw Exception(ErrorCodes::LOGICAL_ERROR, "Column name {} not found in result columns", header_name);
result_columns.emplace_back(it->second);
}
size_t rows_size = result_columns[0]->size();
return Chunk(result_columns, rows_size);
}
std::shared_ptr<DictionarySourceCoordinator> coordinator;
};
bool DictionarySourceCoordinator::getKeyColumnsNextRangeToRead(ColumnsWithTypeAndName & key_columns, ColumnsWithTypeAndName & data_columns)
{
size_t read_block_index = parallel_read_block_index++;
size_t start = max_block_size * read_block_index;
size_t end = max_block_size * (read_block_index + 1);
size_t keys_size = key_columns_with_type[0].column->size();
if (start >= keys_size)
return false;
end = std::min(end, keys_size);
size_t length = end - start;
key_columns = cutColumns(key_columns_with_type, start, length);
data_columns = cutColumns(data_columns_with_type, start, length);
return true;
}
void DictionarySourceCoordinator::initialize(const Names & column_names)
{
ColumnsWithTypeAndName columns_with_type;
const auto & dictionary_structure = dictionary->getStructure();
for (const auto & column_name : column_names)
{
ColumnWithTypeAndName column_with_type;
column_with_type.name = column_name;
auto it = dictionary_structure.attribute_name_to_index.find(column_name);
if (it == dictionary_structure.attribute_name_to_index.end())
{
if (dictionary_structure.id.has_value() && column_name == dictionary_structure.id->name)
{
column_with_type.type = std::make_shared<DataTypeUInt64>();
}
else if (dictionary_structure.range_min.has_value() && column_name == dictionary_structure.range_min->name)
{
column_with_type.type = dictionary_structure.range_min->type;
}
else if (dictionary_structure.range_max.has_value() && column_name == dictionary_structure.range_max->name)
{
column_with_type.type = dictionary_structure.range_max->type;
}
else if (dictionary_structure.key.has_value())
{
const auto & dictionary_key_attributes = *dictionary_structure.key;
for (const auto & attribute : dictionary_key_attributes)
{
if (column_name == attribute.name)
{
column_with_type.type = attribute.type;
break;
}
}
}
}
else
{
const auto & attribute = dictionary_structure.attributes[it->second];
attributes_names_to_read.emplace_back(attribute.name);
attributes_types_to_read.emplace_back(attribute.type);
attributes_default_values_columns.emplace_back(nullptr);
column_with_type.type = attribute.type;
}
if (!column_with_type.type)
throw Exception(ErrorCodes::NO_SUCH_COLUMN_IN_TABLE, "No such column name {} in dictionary {}",
column_name,
dictionary->getDictionaryID().getNameForLogs());
column_with_type.column = column_with_type.type->createColumn();
columns_with_type.emplace_back(std::move(column_with_type));
}
header = Block(std::move(columns_with_type));
}
ColumnsWithTypeAndName
DictionarySourceCoordinator::cutColumns(const ColumnsWithTypeAndName & columns_with_type, size_t start, size_t length)
{
ColumnsWithTypeAndName result;
result.reserve(columns_with_type.size());
for (const auto & column_with_type : columns_with_type)
{
ColumnWithTypeAndName result_column_with_type;
result_column_with_type.column = column_with_type.column->cut(start, length);
result_column_with_type.type = column_with_type.type;
result_column_with_type.name = column_with_type.name;
result.emplace_back(std::move(result_column_with_type));
}
return result;
}
Pipe DictionarySourceCoordinator::read(size_t num_streams)
{
Pipes pipes;
pipes.reserve(num_streams);
auto coordinator = shared_from_this();
for (size_t i = 0; i < num_streams; ++i)
{
auto source = std::make_shared<DictionarySource>(coordinator);
pipes.emplace_back(Pipe(std::move(source)));
}
return Pipe::unitePipes(std::move(pipes));
}
}
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