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293 lines
10 KiB
C++
293 lines
10 KiB
C++
#include <Storages/ColumnsDescription.h>
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#include <Storages/System/StorageSystemPartsBase.h>
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#include <Common/escapeForFileName.h>
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#include <Columns/ColumnString.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypeDate.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <Storages/MergeTree/MergeTreeData.h>
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#include <Storages/VirtualColumnUtils.h>
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#include <Access/ContextAccess.h>
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#include <Databases/IDatabase.h>
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#include <Parsers/queryToString.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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#include <Interpreters/Context.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 LOGICAL_ERROR;
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extern const int TABLE_IS_DROPPED;
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}
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bool StorageSystemPartsBase::hasStateColumn(const Names & column_names, const StorageMetadataPtr & metadata_snapshot) const
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{
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bool has_state_column = false;
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Names real_column_names;
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for (const String & column_name : column_names)
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{
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if (column_name == "_state")
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has_state_column = true;
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else
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real_column_names.emplace_back(column_name);
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}
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/// Do not check if only _state column is requested
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if (!(has_state_column && real_column_names.empty()))
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metadata_snapshot->check(real_column_names, {}, getStorageID());
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return has_state_column;
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}
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MergeTreeData::DataPartsVector
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StoragesInfo::getParts(MergeTreeData::DataPartStateVector & state, bool has_state_column) const
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{
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using State = MergeTreeData::DataPartState;
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if (need_inactive_parts)
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{
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/// If has_state_column is requested, return all states.
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if (!has_state_column)
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return data->getDataPartsVector({State::Committed, State::Outdated}, &state);
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return data->getAllDataPartsVector(&state);
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}
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return data->getDataPartsVector({State::Committed}, &state);
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}
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StoragesInfoStream::StoragesInfoStream(const SelectQueryInfo & query_info, const Context & context)
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: query_id(context.getCurrentQueryId()), settings(context.getSettings())
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{
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/// Will apply WHERE to subset of columns and then add more columns.
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/// This is kind of complicated, but we use WHERE to do less work.
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Block block_to_filter;
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MutableColumnPtr table_column_mut = ColumnString::create();
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MutableColumnPtr engine_column_mut = ColumnString::create();
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MutableColumnPtr active_column_mut = ColumnUInt8::create();
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const auto access = context.getAccess();
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const bool check_access_for_tables = !access->isGranted(AccessType::SHOW_TABLES);
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{
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Databases databases = DatabaseCatalog::instance().getDatabases();
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/// Add column 'database'.
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MutableColumnPtr database_column_mut = ColumnString::create();
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for (const auto & database : databases)
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{
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/// Lazy database can not contain MergeTree tables
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/// and it's unnecessary to load all tables of Lazy database just to filter all of them.
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if (database.second->getEngineName() != "Lazy")
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database_column_mut->insert(database.first);
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}
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block_to_filter.insert(ColumnWithTypeAndName(
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std::move(database_column_mut), std::make_shared<DataTypeString>(), "database"));
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/// Filter block_to_filter with column 'database'.
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VirtualColumnUtils::filterBlockWithQuery(query_info.query, block_to_filter, context);
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rows = block_to_filter.rows();
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/// Block contains new columns, update database_column.
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ColumnPtr database_column_for_filter = block_to_filter.getByName("database").column;
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if (rows)
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{
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/// Add columns 'table', 'engine', 'active'
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IColumn::Offsets offsets(rows);
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for (size_t i = 0; i < rows; ++i)
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{
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String database_name = (*database_column_for_filter)[i].get<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->getTablesIterator(context); iterator->isValid(); iterator->next())
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{
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String table_name = iterator->name();
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StoragePtr storage = iterator->table();
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if (!storage)
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continue;
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String engine_name = storage->getName();
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if (!dynamic_cast<MergeTreeData *>(storage.get()))
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continue;
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if (check_access_for_tables && !access->isGranted(AccessType::SHOW_TABLES, database_name, table_name))
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continue;
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storages[std::make_pair(database_name, iterator->name())] = storage;
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/// Add all combinations of flag 'active'.
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for (UInt64 active : {0, 1})
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{
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table_column_mut->insert(table_name);
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engine_column_mut->insert(engine_name);
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active_column_mut->insert(active);
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}
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offsets[i] += 2;
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}
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}
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for (size_t i = 0; i < block_to_filter.columns(); ++i)
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{
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ColumnPtr & column = block_to_filter.safeGetByPosition(i).column;
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column = column->replicate(offsets);
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}
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}
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}
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block_to_filter.insert(ColumnWithTypeAndName(std::move(table_column_mut), std::make_shared<DataTypeString>(), "table"));
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block_to_filter.insert(ColumnWithTypeAndName(std::move(engine_column_mut), std::make_shared<DataTypeString>(), "engine"));
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block_to_filter.insert(ColumnWithTypeAndName(std::move(active_column_mut), std::make_shared<DataTypeUInt8>(), "active"));
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if (rows)
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{
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/// Filter block_to_filter with columns 'database', 'table', 'engine', 'active'.
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VirtualColumnUtils::filterBlockWithQuery(query_info.query, block_to_filter, context);
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rows = block_to_filter.rows();
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}
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database_column = block_to_filter.getByName("database").column;
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table_column = block_to_filter.getByName("table").column;
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active_column = block_to_filter.getByName("active").column;
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next_row = 0;
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}
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StoragesInfo StoragesInfoStream::next()
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{
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while (next_row < rows)
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{
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StoragesInfo info;
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info.database = (*database_column)[next_row].get<String>();
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info.table = (*table_column)[next_row].get<String>();
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auto is_same_table = [&info, this] (size_t row) -> bool
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{
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return (*database_column)[row].get<String>() == info.database &&
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(*table_column)[row].get<String>() == info.table;
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};
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/// We may have two rows per table which differ in 'active' value.
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/// If rows with 'active = 0' were not filtered out, this means we
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/// must collect the inactive parts. Remember this fact in StoragesInfo.
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for (; next_row < rows && is_same_table(next_row); ++next_row)
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{
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const auto active = (*active_column)[next_row].get<UInt64>();
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if (active == 0)
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info.need_inactive_parts = true;
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}
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info.storage = storages.at(std::make_pair(info.database, info.table));
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try
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{
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/// For table not to be dropped and set of columns to remain constant.
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info.table_lock = info.storage->lockForShare(query_id, settings.lock_acquire_timeout);
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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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throw;
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}
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info.engine = info.storage->getName();
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info.data = dynamic_cast<MergeTreeData *>(info.storage.get());
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if (!info.data)
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throw Exception("Unknown engine " + info.engine, ErrorCodes::LOGICAL_ERROR);
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return info;
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}
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return {};
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}
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Pipes StorageSystemPartsBase::read(
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const Names & column_names,
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const StorageMetadataPtr & metadata_snapshot,
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const SelectQueryInfo & query_info,
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const Context & context,
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QueryProcessingStage::Enum /*processed_stage*/,
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const size_t /*max_block_size*/,
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const unsigned /*num_streams*/)
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{
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bool has_state_column = hasStateColumn(column_names, metadata_snapshot);
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StoragesInfoStream stream(query_info, context);
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/// Create the result.
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MutableColumns res_columns = metadata_snapshot->getSampleBlock().cloneEmptyColumns();
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if (has_state_column)
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res_columns.push_back(ColumnString::create());
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while (StoragesInfo info = stream.next())
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{
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processNextStorage(res_columns, info, has_state_column);
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}
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Block header = metadata_snapshot->getSampleBlock();
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if (has_state_column)
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header.insert(ColumnWithTypeAndName(std::make_shared<DataTypeString>(), "_state"));
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UInt64 num_rows = res_columns.at(0)->size();
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Chunk chunk(std::move(res_columns), num_rows);
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Pipes pipes;
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pipes.emplace_back(std::make_shared<SourceFromSingleChunk>(std::move(header), std::move(chunk)));
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return pipes;
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}
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StorageSystemPartsBase::StorageSystemPartsBase(std::string name_, NamesAndTypesList && columns_)
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: IStorage(StorageID{"system", name_})
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{
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ColumnsDescription tmp_columns(std::move(columns_));
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auto add_alias = [&](const String & alias_name, const String & column_name)
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{
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ColumnDescription column(alias_name, tmp_columns.get(column_name).type);
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column.default_desc.kind = ColumnDefaultKind::Alias;
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column.default_desc.expression = std::make_shared<ASTIdentifier>(column_name);
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tmp_columns.add(column);
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};
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/// Add aliases for old column names for backwards compatibility.
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add_alias("bytes", "bytes_on_disk");
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add_alias("marks_size", "marks_bytes");
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StorageInMemoryMetadata storage_metadata;
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storage_metadata.setColumns(tmp_columns);
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setInMemoryMetadata(storage_metadata);
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}
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NamesAndTypesList StorageSystemPartsBase::getVirtuals() const
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{
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return NamesAndTypesList{
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NameAndTypePair("_state", std::make_shared<DataTypeString>())
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};
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}
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}
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