#include #include #include #include #include #include #include #include #include namespace DB { /** * Implements system table 'detached_parts' which allows to get information * about detached data parts for tables of MergeTree family. * We don't use StorageSystemPartsBase, because it introduces virtual _state * column and column aliases which we don't need. */ class StorageSystemDetachedParts final : public ext::shared_ptr_helper, public IStorage { friend struct ext::shared_ptr_helper; public: std::string getName() const override { return "SystemDetachedParts"; } protected: explicit StorageSystemDetachedParts() : IStorage({"system", "detached_parts"}) { setColumns(ColumnsDescription{{ {"database", std::make_shared()}, {"table", std::make_shared()}, {"partition_id", std::make_shared(std::make_shared())}, {"name", std::make_shared()}, {"disk", std::make_shared()}, {"reason", std::make_shared(std::make_shared())}, {"min_block_number", std::make_shared(std::make_shared())}, {"max_block_number", std::make_shared(std::make_shared())}, {"level", std::make_shared(std::make_shared())} }}); } Pipes read( const Names & /* column_names */, const SelectQueryInfo & query_info, const Context & context, QueryProcessingStage::Enum /*processed_stage*/, const size_t /*max_block_size*/, const unsigned /*num_streams*/) override { StoragesInfoStream stream(query_info, context); /// Create the result. Block block = getSampleBlock(); MutableColumns new_columns = block.cloneEmptyColumns(); while (StoragesInfo info = stream.next()) { const auto parts = info.data->getDetachedParts(); for (const auto & p : parts) { size_t i = 0; new_columns[i++]->insert(info.database); new_columns[i++]->insert(info.table); new_columns[i++]->insert(p.valid_name ? p.partition_id : Field()); new_columns[i++]->insert(p.dir_name); new_columns[i++]->insert(p.disk); new_columns[i++]->insert(p.valid_name ? p.prefix : Field()); new_columns[i++]->insert(p.valid_name ? p.min_block : Field()); new_columns[i++]->insert(p.valid_name ? p.max_block : Field()); new_columns[i++]->insert(p.valid_name ? p.level : Field()); } } UInt64 num_rows = new_columns.at(0)->size(); Chunk chunk(std::move(new_columns), num_rows); Pipes pipes; pipes.emplace_back(std::make_shared(std::move(block), std::move(chunk))); return pipes; } }; StoragePtr createDetachedPartsTable() { return StorageSystemDetachedParts::create(); } }