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ClickHouse/src/Storages/System/StorageSystemTables.cpp
Alexander Tokmakov 128b19fdba Merge branch 'master' into use_atomic_engine_for_system_db
2020-08-14 13:47:44 +03:00

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#include <Columns/ColumnString.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataStreams/OneBlockInputStream.h>
#include <Storages/System/StorageSystemTables.h>
#include <Storages/VirtualColumnUtils.h>
#include <Databases/IDatabase.h>
#include <Access/ContextAccess.h>
#include <Interpreters/Context.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/queryToString.h>
#include <Common/typeid_cast.h>
#include <Common/StringUtils/StringUtils.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeArray.h>
#include <Disks/StoragePolicy.h>
#include <Processors/Sources/SourceWithProgress.h>
#include <Processors/Pipe.h>
#include <DataTypes/DataTypeUUID.h>
namespace DB
{
namespace ErrorCodes
{
extern const int TABLE_IS_DROPPED;
}
StorageSystemTables::StorageSystemTables(const StorageID & table_id_)
: IStorage(table_id_)
{
StorageInMemoryMetadata storage_metadata;
storage_metadata.setColumns(ColumnsDescription(
{
{"database", std::make_shared<DataTypeString>()},
{"name", std::make_shared<DataTypeString>()},
{"uuid", std::make_shared<DataTypeUUID>()},
{"engine", std::make_shared<DataTypeString>()},
{"is_temporary", std::make_shared<DataTypeUInt8>()},
{"data_paths", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
{"metadata_path", std::make_shared<DataTypeString>()},
{"metadata_modification_time", std::make_shared<DataTypeDateTime>()},
{"dependencies_database", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
{"dependencies_table", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
{"create_table_query", std::make_shared<DataTypeString>()},
{"engine_full", std::make_shared<DataTypeString>()},
{"partition_key", std::make_shared<DataTypeString>()},
{"sorting_key", std::make_shared<DataTypeString>()},
{"primary_key", std::make_shared<DataTypeString>()},
{"sampling_key", std::make_shared<DataTypeString>()},
{"storage_policy", std::make_shared<DataTypeString>()},
{"total_rows", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeUInt64>())},
{"total_bytes", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeUInt64>())},
{"lifetime_rows", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeUInt64>())},
{"lifetime_bytes", std::make_shared<DataTypeNullable>(std::make_shared<DataTypeUInt64>())},
}));
setInMemoryMetadata(storage_metadata);
}
static ColumnPtr getFilteredDatabases(const ASTPtr & query, const Context & context)
{
MutableColumnPtr column = ColumnString::create();
for (const auto & db : DatabaseCatalog::instance().getDatabases())
column->insert(db.first);
Block block { ColumnWithTypeAndName(std::move(column), std::make_shared<DataTypeString>(), "database") };
VirtualColumnUtils::filterBlockWithQuery(query, block, context);
return block.getByPosition(0).column;
}
/// Avoid heavy operation on tables if we only queried columns that we can get without table object.
/// Otherwise it will require table initialization for Lazy database.
static bool needLockStructure(const DatabasePtr & database, const Block & header)
{
if (database->getEngineName() != "Lazy")
return true;
static const std::set<std::string> columns_without_lock = { "database", "name", "uuid", "metadata_modification_time" };
for (const auto & column : header.getColumnsWithTypeAndName())
{
if (columns_without_lock.find(column.name) == columns_without_lock.end())
return true;
}
return false;
}
class TablesBlockSource : public SourceWithProgress
{
public:
TablesBlockSource(
std::vector<UInt8> columns_mask_,
Block header,
UInt64 max_block_size_,
ColumnPtr databases_,
const Context & context_)
: SourceWithProgress(std::move(header))
, columns_mask(std::move(columns_mask_))
, max_block_size(max_block_size_)
, databases(std::move(databases_))
, context(context_) {}
String getName() const override { return "Tables"; }
protected:
Chunk generate() override
{
if (done)
return {};
MutableColumns res_columns = getPort().getHeader().cloneEmptyColumns();
const auto access = context.getAccess();
const bool check_access_for_databases = !access->isGranted(AccessType::SHOW_TABLES);
size_t rows_count = 0;
while (rows_count < max_block_size)
{
if (tables_it && !tables_it->isValid())
++database_idx;
while (database_idx < databases->size() && (!tables_it || !tables_it->isValid()))
{
database_name = databases->getDataAt(database_idx).toString();
database = DatabaseCatalog::instance().tryGetDatabase(database_name);
if (!database)
{
/// Database was deleted just now or the user has no access.
++database_idx;
continue;
}
break;
}
/// This is for temporary tables. They are output in single block regardless to max_block_size.
if (database_idx >= databases->size())
{
if (context.hasSessionContext())
{
Tables external_tables = context.getSessionContext().getExternalTables();
for (auto & table : external_tables)
{
size_t src_index = 0;
size_t res_index = 0;
// database
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// name
if (columns_mask[src_index++])
res_columns[res_index++]->insert(table.first);
// uuid
if (columns_mask[src_index++])
res_columns[res_index++]->insert(table.second->getStorageID().uuid);
// engine
if (columns_mask[src_index++])
res_columns[res_index++]->insert(table.second->getName());
// is_temporary
if (columns_mask[src_index++])
res_columns[res_index++]->insert(1u);
// data_paths
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// metadata_path
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// metadata_modification_time
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// dependencies_database
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// dependencies_table
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// create_table_query
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// engine_full
if (columns_mask[src_index++])
res_columns[res_index++]->insert(table.second->getName());
// partition_key
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// sorting_key
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// primary_key
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// sampling_key
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// storage_policy
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// total_rows
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// total_bytes
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// lifetime_rows
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
// lifetime_bytes
if (columns_mask[src_index++])
res_columns[res_index++]->insertDefault();
}
}
UInt64 num_rows = res_columns.at(0)->size();
done = true;
return Chunk(std::move(res_columns), num_rows);
}
const bool check_access_for_tables = check_access_for_databases && !access->isGranted(AccessType::SHOW_TABLES, database_name);
if (!tables_it || !tables_it->isValid())
tables_it = database->getTablesIterator(context);
const bool need_lock_structure = needLockStructure(database, getPort().getHeader());
for (; rows_count < max_block_size && tables_it->isValid(); tables_it->next())
{
auto table_name = tables_it->name();
if (check_access_for_tables && !access->isGranted(AccessType::SHOW_TABLES, database_name, table_name))
continue;
StoragePtr table = nullptr;
TableLockHolder lock;
if (need_lock_structure)
{
table = tables_it->table();
if (table == nullptr)
{
// Table might have just been removed or detached for Lazy engine (see DatabaseLazy::tryGetTable())
continue;
}
try
{
lock = table->lockForShare(context.getCurrentQueryId(), context.getSettingsRef().lock_acquire_timeout);
}
catch (const Exception & e)
{
if (e.code() == ErrorCodes::TABLE_IS_DROPPED)
continue;
throw;
}
}
++rows_count;
size_t src_index = 0;
size_t res_index = 0;
if (columns_mask[src_index++])
res_columns[res_index++]->insert(database_name);
if (columns_mask[src_index++])
res_columns[res_index++]->insert(table_name);
if (columns_mask[src_index++])
res_columns[res_index++]->insert(tables_it->uuid());
if (columns_mask[src_index++])
{
assert(table != nullptr);
res_columns[res_index++]->insert(table->getName());
}
if (columns_mask[src_index++])
res_columns[res_index++]->insert(0u); // is_temporary
if (columns_mask[src_index++])
{
assert(table != nullptr);
Array table_paths_array;
auto paths = table->getDataPaths();
table_paths_array.reserve(paths.size());
for (const String & path : paths)
table_paths_array.push_back(path);
res_columns[res_index++]->insert(table_paths_array);
}
if (columns_mask[src_index++])
res_columns[res_index++]->insert(database->getObjectMetadataPath(table_name));
if (columns_mask[src_index++])
res_columns[res_index++]->insert(static_cast<UInt64>(database->getObjectMetadataModificationTime(table_name)));
{
Array dependencies_table_name_array;
Array dependencies_database_name_array;
if (columns_mask[src_index] || columns_mask[src_index + 1])
{
const auto dependencies = DatabaseCatalog::instance().getDependencies(StorageID(database_name, table_name));
dependencies_table_name_array.reserve(dependencies.size());
dependencies_database_name_array.reserve(dependencies.size());
for (const auto & dependency : dependencies)
{
dependencies_table_name_array.push_back(dependency.table_name);
dependencies_database_name_array.push_back(dependency.database_name);
}
}
if (columns_mask[src_index++])
res_columns[res_index++]->insert(dependencies_database_name_array);
if (columns_mask[src_index++])
res_columns[res_index++]->insert(dependencies_table_name_array);
}
if (columns_mask[src_index] || columns_mask[src_index + 1])
{
ASTPtr ast = database->tryGetCreateTableQuery(table_name, context);
if (columns_mask[src_index++])
res_columns[res_index++]->insert(ast ? queryToString(ast) : "");
if (columns_mask[src_index++])
{
String engine_full;
if (ast)
{
const auto & ast_create = ast->as<ASTCreateQuery &>();
if (ast_create.storage)
{
engine_full = queryToString(*ast_create.storage);
static const char * const extra_head = " ENGINE = ";
if (startsWith(engine_full, extra_head))
engine_full = engine_full.substr(strlen(extra_head));
}
}
res_columns[res_index++]->insert(engine_full);
}
}
else
src_index += 2;
StorageMetadataPtr metadata_snapshot;
if (table != nullptr)
metadata_snapshot = table->getInMemoryMetadataPtr();
ASTPtr expression_ptr;
if (columns_mask[src_index++])
{
assert(metadata_snapshot != nullptr);
if ((expression_ptr = metadata_snapshot->getPartitionKeyAST()))
res_columns[res_index++]->insert(queryToString(expression_ptr));
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(metadata_snapshot != nullptr);
if ((expression_ptr = metadata_snapshot->getSortingKey().expression_list_ast))
res_columns[res_index++]->insert(queryToString(expression_ptr));
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(metadata_snapshot != nullptr);
if ((expression_ptr = metadata_snapshot->getPrimaryKey().expression_list_ast))
res_columns[res_index++]->insert(queryToString(expression_ptr));
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(metadata_snapshot != nullptr);
if ((expression_ptr = metadata_snapshot->getSamplingKeyAST()))
res_columns[res_index++]->insert(queryToString(expression_ptr));
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(table != nullptr);
auto policy = table->getStoragePolicy();
if (policy)
res_columns[res_index++]->insert(policy->getName());
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(table != nullptr);
auto total_rows = table->totalRows();
if (total_rows)
res_columns[res_index++]->insert(*total_rows);
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(table != nullptr);
auto total_bytes = table->totalBytes();
if (total_bytes)
res_columns[res_index++]->insert(*total_bytes);
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(table != nullptr);
auto lifetime_rows = table->lifetimeRows();
if (lifetime_rows)
res_columns[res_index++]->insert(*lifetime_rows);
else
res_columns[res_index++]->insertDefault();
}
if (columns_mask[src_index++])
{
assert(table != nullptr);
auto lifetime_bytes = table->lifetimeBytes();
if (lifetime_bytes)
res_columns[res_index++]->insert(*lifetime_bytes);
else
res_columns[res_index++]->insertDefault();
}
}
}
UInt64 num_rows = res_columns.at(0)->size();
return Chunk(std::move(res_columns), num_rows);
}
private:
std::vector<UInt8> columns_mask;
UInt64 max_block_size;
ColumnPtr databases;
size_t database_idx = 0;
DatabaseTablesIteratorPtr tables_it;
const Context context;
bool done = false;
DatabasePtr database;
std::string database_name;
};
Pipe StorageSystemTables::read(
const Names & column_names,
const StorageMetadataPtr & metadata_snapshot,
const SelectQueryInfo & query_info,
const Context & context,
QueryProcessingStage::Enum /*processed_stage*/,
const size_t max_block_size,
const unsigned /*num_streams*/)
{
metadata_snapshot->check(column_names, getVirtuals(), getStorageID());
/// Create a mask of what columns are needed in the result.
NameSet names_set(column_names.begin(), column_names.end());
Block sample_block = metadata_snapshot->getSampleBlock();
Block res_block;
std::vector<UInt8> columns_mask(sample_block.columns());
for (size_t i = 0, size = columns_mask.size(); i < size; ++i)
{
if (names_set.count(sample_block.getByPosition(i).name))
{
columns_mask[i] = 1;
res_block.insert(sample_block.getByPosition(i));
}
}
ColumnPtr filtered_databases_column = getFilteredDatabases(query_info.query, context);
return Pipe(std::make_shared<TablesBlockSource>(
std::move(columns_mask), std::move(res_block), max_block_size, std::move(filtered_databases_column), context));
}
}
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