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294 lines
10 KiB
C++
294 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 <Databases/IDatabase.h>
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#include <Parsers/queryToString.h>
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#include <Parsers/ASTIdentifier.h>
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namespace DB
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{
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bool StorageSystemPartsBase::hasStateColumn(const Names & column_names)
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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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check(real_column_names);
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return has_state_column;
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}
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class StoragesInfoStream
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{
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public:
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StoragesInfoStream(const SelectQueryInfo & query_info, const Context & context, bool has_state_column)
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: query_id(context.getCurrentQueryId())
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, has_state_column(has_state_column)
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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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{
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Databases databases = context.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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if (context.hasDatabaseAccessRights(database.first))
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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_ = 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_)[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->getIterator(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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String engine_name = storage->getName();
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if (!dynamic_cast<MergeTreeData *>(storage.get()))
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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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StorageSystemPartsBase::StoragesInfo next()
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{
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StorageSystemPartsBase::StoragesInfo info;
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info.storage = nullptr;
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while (next_row < rows)
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{
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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 isSameTable = [&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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/// What 'active' value we need.
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bool need[2]{}; /// [active]
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for (; next_row < rows && isSameTable(next_row); ++next_row)
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{
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bool active = (*active_column)[next_row].get<UInt64>() != 0;
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need[active] = 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->lockStructureForShare(false, query_id);
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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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using State = MergeTreeDataPart::State;
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auto & all_parts_state = info.all_parts_state;
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auto & all_parts = info.all_parts;
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if (need[0])
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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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all_parts = info.data->getDataPartsVector({State::Committed, State::Outdated}, &all_parts_state);
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else
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all_parts = info.data->getAllDataPartsVector(&all_parts_state);
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}
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else
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all_parts = info.data->getDataPartsVector({State::Committed}, &all_parts_state);
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break;
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}
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return info;
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}
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private:
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String query_id;
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bool has_state_column;
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ColumnPtr database_column;
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ColumnPtr table_column;
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ColumnPtr active_column;
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size_t next_row;
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size_t rows;
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using StoragesMap = std::map<std::pair<String, String>, StoragePtr>;
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StoragesMap storages;
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};
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BlockInputStreams StorageSystemPartsBase::read(
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const Names & column_names,
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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);
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StoragesInfoStream stream(query_info, context, has_state_column);
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/// Create the result.
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MutableColumns res_columns = 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 block = getSampleBlock();
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if (has_state_column)
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block.insert(ColumnWithTypeAndName(std::make_shared<DataTypeString>(), "_state"));
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return BlockInputStreams(1, std::make_shared<OneBlockInputStream>(block.cloneWithColumns(std::move(res_columns))));
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}
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NameAndTypePair StorageSystemPartsBase::getColumn(const String & column_name) const
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{
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if (column_name == "_state")
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return NameAndTypePair("_state", std::make_shared<DataTypeString>());
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return ITableDeclaration::getColumn(column_name);
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}
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bool StorageSystemPartsBase::hasColumn(const String & column_name) const
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{
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if (column_name == "_state")
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return true;
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return ITableDeclaration::hasColumn(column_name);
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}
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StorageSystemPartsBase::StorageSystemPartsBase(std::string name_, NamesAndTypesList && columns_)
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: name(std::move(name_))
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{
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ColumnsDescription 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, 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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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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setColumns(columns);
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}
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}
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