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217 lines
7.4 KiB
C++
217 lines
7.4 KiB
C++
#include <DB/Storages/System/StorageSystemColumns.h>
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#include <DB/Storages/MergeTree/MergeTreeData.h>
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#include <DB/Storages/StorageMergeTree.h>
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#include <DB/Storages/StorageReplicatedMergeTree.h>
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#include <DB/Columns/ColumnString.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/DataStreams/OneBlockInputStream.h>
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#include <DB/Common/VirtualColumnUtils.h>
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#include <DB/Databases/IDatabase.h>
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namespace DB
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{
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StorageSystemColumns::StorageSystemColumns(const std::string & name_)
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: name(name_)
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, columns{
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{ "database", std::make_shared<DataTypeString>() },
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{ "table", std::make_shared<DataTypeString>() },
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{ "name", std::make_shared<DataTypeString>() },
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{ "type", std::make_shared<DataTypeString>() },
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{ "default_type", std::make_shared<DataTypeString>() },
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{ "default_expression", std::make_shared<DataTypeString>() },
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{ "bytes", std::make_shared<DataTypeUInt64>() },
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}
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{
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}
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StoragePtr StorageSystemColumns::create(const std::string & name_)
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{
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return make_shared(name_);
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}
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BlockInputStreams StorageSystemColumns::read(
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const Names & column_names,
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ASTPtr query,
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const Context & context,
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const Settings & settings,
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QueryProcessingStage::Enum & processed_stage,
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const size_t max_block_size,
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const unsigned threads)
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{
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check(column_names);
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processed_stage = QueryProcessingStage::FetchColumns;
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Block block;
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std::map<std::pair<std::string, std::string>, StoragePtr> storages;
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{
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Databases databases = context.getDatabases();
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/// Добавляем столбец database.
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ColumnPtr database_column = std::make_shared<ColumnString>();
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for (const auto & database : databases)
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database_column->insert(database.first);
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block.insert(ColumnWithTypeAndName(database_column, std::make_shared<DataTypeString>(), "database"));
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/// Отфильтруем блок со столбцом database.
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VirtualColumnUtils::filterBlockWithQuery(query, block, context);
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if (!block.rows())
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return BlockInputStreams();
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database_column = block.getByName("database").column;
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size_t rows = database_column->size();
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/// Добавляем столбец table.
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ColumnPtr table_column = std::make_shared<ColumnString>();
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IColumn::Offsets_t offsets(rows);
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for (size_t i = 0; i < rows; ++i)
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{
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const std::string database_name = (*database_column)[i].get<std::string>();
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const DatabasePtr database = databases.at(database_name);
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offsets[i] = i ? offsets[i - 1] : 0;
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for (auto iterator = database->getIterator(); iterator->isValid(); iterator->next())
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{
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const String & table_name = iterator->name();
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storages.emplace(std::piecewise_construct,
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std::forward_as_tuple(database_name, table_name),
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std::forward_as_tuple(iterator->table()));
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table_column->insert(table_name);
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offsets[i] += 1;
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}
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}
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for (size_t i = 0; i < block.columns(); ++i)
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{
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ColumnPtr & column = block.getByPosition(i).column;
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column = column->replicate(offsets);
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}
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block.insert(ColumnWithTypeAndName(table_column, std::make_shared<DataTypeString>(), "table"));
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}
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/// Отфильтруем блок со столбцами database и table.
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VirtualColumnUtils::filterBlockWithQuery(query, block, context);
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if (!block.rows())
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return BlockInputStreams();
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ColumnPtr filtered_database_column = block.getByName("database").column;
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ColumnPtr filtered_table_column = block.getByName("table").column;
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/// Составляем результат.
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ColumnPtr database_column = std::make_shared<ColumnString>();
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ColumnPtr table_column = std::make_shared<ColumnString>();
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ColumnPtr name_column = std::make_shared<ColumnString>();
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ColumnPtr type_column = std::make_shared<ColumnString>();
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ColumnPtr default_type_column = std::make_shared<ColumnString>();
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ColumnPtr default_expression_column = std::make_shared<ColumnString>();
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ColumnPtr bytes_column = std::make_shared<ColumnUInt64>();
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size_t rows = filtered_database_column->size();
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for (size_t i = 0; i < rows; ++i)
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{
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const std::string database_name = (*filtered_database_column)[i].get<std::string>();
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const std::string table_name = (*filtered_table_column)[i].get<std::string>();
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NamesAndTypesList columns;
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ColumnDefaults column_defaults;
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std::unordered_map<String, size_t> column_sizes;
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{
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StoragePtr storage = storages.at(std::make_pair(database_name, table_name));
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IStorage::TableStructureReadLockPtr table_lock;
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try
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{
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table_lock = storage->lockStructure(false);
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}
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catch (const Exception & e)
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{
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/** There are case when IStorage::drop was called,
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* but we still own the object.
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* Then table will throw exception at attempt to lock it.
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* Just skip the table.
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*/
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if (e.code() == ErrorCodes::TABLE_IS_DROPPED)
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continue;
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else
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throw;
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}
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columns = storage->getColumnsList();
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columns.insert(std::end(columns), std::begin(storage->alias_columns), std::end(storage->alias_columns));
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column_defaults = storage->column_defaults;
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/** Данные о размерах столбцов для таблиц семейства MergeTree.
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* NOTE: В дальнейшем можно сделать интерфейс, позволяющий получить размеры столбцов у IStorage.
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*/
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if (auto storage_concrete = dynamic_cast<StorageMergeTree *>(storage.get()))
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{
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column_sizes = storage_concrete->getData().getColumnSizes();
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}
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else if (auto storage_concrete = dynamic_cast<StorageReplicatedMergeTree *>(storage.get()))
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{
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column_sizes = storage_concrete->getData().getColumnSizes();
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auto unreplicated_data = storage_concrete->getUnreplicatedData();
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if (unreplicated_data)
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{
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auto unreplicated_column_sizes = unreplicated_data->getColumnSizes();
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for (const auto & name_size : unreplicated_column_sizes)
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column_sizes[name_size.first] += name_size.second;
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}
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}
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}
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for (const auto & column : columns)
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{
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database_column->insert(database_name);
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table_column->insert(table_name);
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name_column->insert(column.name);
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type_column->insert(column.type->getName());
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{
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const auto it = column_defaults.find(column.name);
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if (it == std::end(column_defaults))
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{
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default_type_column->insertDefault();
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default_expression_column->insertDefault();
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}
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else
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{
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default_type_column->insert(toString(it->second.type));
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default_expression_column->insert(queryToString(it->second.expression));
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}
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}
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{
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const auto it = column_sizes.find(column.name);
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if (it == std::end(column_sizes))
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bytes_column->insertDefault();
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else
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bytes_column->insert(it->second);
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}
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}
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}
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block.clear();
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block.insert(ColumnWithTypeAndName(database_column, std::make_shared<DataTypeString>(), "database"));
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block.insert(ColumnWithTypeAndName(table_column, std::make_shared<DataTypeString>(), "table"));
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block.insert(ColumnWithTypeAndName(name_column, std::make_shared<DataTypeString>(), "name"));
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block.insert(ColumnWithTypeAndName(type_column, std::make_shared<DataTypeString>(), "type"));
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block.insert(ColumnWithTypeAndName(default_type_column, std::make_shared<DataTypeString>(), "default_type"));
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block.insert(ColumnWithTypeAndName(default_expression_column, std::make_shared<DataTypeString>(), "default_expression"));
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block.insert(ColumnWithTypeAndName(bytes_column, std::make_shared<DataTypeUInt64>(), "bytes"));
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return BlockInputStreams{ 1, std::make_shared<OneBlockInputStream>(block) };
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}
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}
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