mirror of
https://github.com/ClickHouse/ClickHouse.git
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357 lines
13 KiB
C++
357 lines
13 KiB
C++
#include <Columns/ColumnString.h>
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#include <Columns/ColumnsNumber.h>
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#include <DataTypes/DataTypeString.h>
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#include <DataTypes/DataTypeDateTime.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <Storages/System/StorageSystemTables.h>
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#include <Storages/VirtualColumnUtils.h>
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#include <Databases/IDatabase.h>
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#include <Interpreters/Context.h>
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#include <Parsers/ASTCreateQuery.h>
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#include <Parsers/queryToString.h>
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#include <Common/typeid_cast.h>
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#include <Common/StringUtils/StringUtils.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <DataTypes/DataTypeArray.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 CANNOT_GET_CREATE_TABLE_QUERY;
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extern const int TABLE_IS_DROPPED;
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}
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StorageSystemTables::StorageSystemTables(const std::string & name_)
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: name(name_)
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{
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setColumns(ColumnsDescription(
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{
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{"database", std::make_shared<DataTypeString>()},
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{"name", std::make_shared<DataTypeString>()},
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{"engine", std::make_shared<DataTypeString>()},
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{"is_temporary", std::make_shared<DataTypeUInt8>()},
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{"data_path", std::make_shared<DataTypeString>()},
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{"metadata_path", std::make_shared<DataTypeString>()},
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{"metadata_modification_time", std::make_shared<DataTypeDateTime>()},
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{"dependencies_database", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
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{"dependencies_table", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
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{"create_table_query", std::make_shared<DataTypeString>()},
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{"engine_full", std::make_shared<DataTypeString>()},
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{"partition_key", std::make_shared<DataTypeString>()},
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{"sorting_key", std::make_shared<DataTypeString>()},
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{"primary_key", std::make_shared<DataTypeString>()},
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{"sampling_key", std::make_shared<DataTypeString>()},
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}));
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}
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static ColumnPtr getFilteredDatabases(const ASTPtr & query, const Context & context)
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{
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MutableColumnPtr column = ColumnString::create();
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for (const auto & db : context.getDatabases())
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column->insert(db.first);
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Block block { ColumnWithTypeAndName(std::move(column), std::make_shared<DataTypeString>(), "database") };
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VirtualColumnUtils::filterBlockWithQuery(query, block, context);
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return block.getByPosition(0).column;
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}
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class TablesBlockInputStream : public IBlockInputStream
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{
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public:
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TablesBlockInputStream(
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std::vector<UInt8> columns_mask_,
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Block header_,
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UInt64 max_block_size_,
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ColumnPtr databases_,
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const Context & context_)
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: columns_mask(std::move(columns_mask_)), header(std::move(header_)), max_block_size(max_block_size_), databases(std::move(databases_)), context(context_) {}
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String getName() const override { return "Tables"; }
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Block getHeader() const override { return header; }
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protected:
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Block readImpl() override
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{
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if (done)
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return {};
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Block res = header;
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MutableColumns res_columns = header.cloneEmptyColumns();
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size_t rows_count = 0;
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while (rows_count < max_block_size)
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{
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if (tables_it && !tables_it->isValid())
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++database_idx;
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while (database_idx < databases->size() && (!tables_it || !tables_it->isValid()))
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{
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database_name = databases->getDataAt(database_idx).toString();
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database = context.tryGetDatabase(database_name);
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if (!database || !context.hasDatabaseAccessRights(database_name))
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{
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/// Database was deleted just now or the user has no access.
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++database_idx;
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continue;
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}
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break;
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}
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/// This is for temporary tables. They are output in single block regardless to max_block_size.
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if (database_idx >= databases->size())
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{
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if (context.hasSessionContext())
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{
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Tables external_tables = context.getSessionContext().getExternalTables();
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for (auto table : external_tables)
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{
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size_t src_index = 0;
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size_t res_index = 0;
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(table.first);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(table.second->getName());
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(1u);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(table.second->getName());
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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if (columns_mask[src_index++])
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res_columns[res_index++]->insertDefault();
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}
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}
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res.setColumns(std::move(res_columns));
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done = true;
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return res;
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}
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if (!tables_it || !tables_it->isValid())
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tables_it = database->getIterator(context);
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for (; rows_count < max_block_size && tables_it->isValid(); tables_it->next())
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{
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auto table_name = tables_it->name();
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const StoragePtr & table = tables_it->table();
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TableStructureReadLockHolder lock;
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try
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{
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lock = table->lockStructureForShare(false, context.getCurrentQueryId());
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}
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catch (const Exception & e)
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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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++rows_count;
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size_t src_index = 0;
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size_t res_index = 0;
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(database_name);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(table_name);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(table->getName());
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(0u); // is_temporary
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(table->getDataPath());
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(database->getTableMetadataPath(table_name));
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(static_cast<UInt64>(database->getTableMetadataModificationTime(context, table_name)));
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{
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Array dependencies_table_name_array;
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Array dependencies_database_name_array;
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if (columns_mask[src_index] || columns_mask[src_index + 1])
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{
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const auto dependencies = context.getDependencies(database_name, table_name);
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dependencies_table_name_array.reserve(dependencies.size());
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dependencies_database_name_array.reserve(dependencies.size());
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for (const auto & dependency : dependencies)
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{
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dependencies_table_name_array.push_back(dependency.second);
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dependencies_database_name_array.push_back(dependency.first);
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}
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}
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(dependencies_database_name_array);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(dependencies_table_name_array);
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}
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if (columns_mask[src_index] || columns_mask[src_index + 1])
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{
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ASTPtr ast = database->tryGetCreateTableQuery(context, table_name);
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if (columns_mask[src_index++])
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res_columns[res_index++]->insert(ast ? queryToString(ast) : "");
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if (columns_mask[src_index++])
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{
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String engine_full;
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if (ast)
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{
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const auto & ast_create = ast->as<ASTCreateQuery &>();
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if (ast_create.storage)
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{
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engine_full = queryToString(*ast_create.storage);
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static const char * const extra_head = " ENGINE = ";
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if (startsWith(engine_full, extra_head))
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engine_full = engine_full.substr(strlen(extra_head));
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}
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}
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res_columns[res_index++]->insert(engine_full);
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}
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}
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else
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src_index += 2;
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ASTPtr expression_ptr;
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if (columns_mask[src_index++])
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{
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if ((expression_ptr = table->getPartitionKeyAST()))
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res_columns[res_index++]->insert(queryToString(expression_ptr));
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else
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res_columns[res_index++]->insertDefault();
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}
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if (columns_mask[src_index++])
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{
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if ((expression_ptr = table->getSortingKeyAST()))
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res_columns[res_index++]->insert(queryToString(expression_ptr));
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else
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res_columns[res_index++]->insertDefault();
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}
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if (columns_mask[src_index++])
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{
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if ((expression_ptr = table->getPrimaryKeyAST()))
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res_columns[res_index++]->insert(queryToString(expression_ptr));
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else
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res_columns[res_index++]->insertDefault();
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}
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if (columns_mask[src_index++])
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{
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if ((expression_ptr = table->getSamplingKeyAST()))
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res_columns[res_index++]->insert(queryToString(expression_ptr));
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else
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res_columns[res_index++]->insertDefault();
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}
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}
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}
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res.setColumns(std::move(res_columns));
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return res;
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}
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private:
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std::vector<UInt8> columns_mask;
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Block header;
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UInt64 max_block_size;
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ColumnPtr databases;
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size_t database_idx = 0;
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DatabaseIteratorPtr tables_it;
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const Context context;
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bool done = false;
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DatabasePtr database;
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std::string database_name;
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};
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BlockInputStreams StorageSystemTables::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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check(column_names);
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/// Create a mask of what columns are needed in the result.
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NameSet names_set(column_names.begin(), column_names.end());
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Block sample_block = getSampleBlock();
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Block res_block;
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std::vector<UInt8> columns_mask(sample_block.columns());
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for (size_t i = 0, size = columns_mask.size(); i < size; ++i)
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{
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if (names_set.count(sample_block.getByPosition(i).name))
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{
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columns_mask[i] = 1;
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res_block.insert(sample_block.getByPosition(i));
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}
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}
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ColumnPtr filtered_databases_column = getFilteredDatabases(query_info.query, context);
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return {std::make_shared<TablesBlockInputStream>(
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std::move(columns_mask), std::move(res_block), max_block_size, std::move(filtered_databases_column), context)};
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}
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}
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