ClickHouse/dbms/src/Storages/StorageMaterializedView.cpp
2020-02-25 17:35:37 +03:00

440 lines
15 KiB
C++

#include <Storages/StorageMaterializedView.h>
#include <Parsers/ASTSelectQuery.h>
#include <Parsers/ASTSelectWithUnionQuery.h>
#include <Parsers/ASTCreateQuery.h>
#include <Parsers/ASTDropQuery.h>
#include <Interpreters/Context.h>
#include <Interpreters/InterpreterCreateQuery.h>
#include <Interpreters/InterpreterDropQuery.h>
#include <Interpreters/InterpreterRenameQuery.h>
#include <Interpreters/getTableExpressions.h>
#include <Interpreters/AddDefaultDatabaseVisitor.h>
#include <Access/AccessFlags.h>
#include <DataStreams/IBlockInputStream.h>
#include <DataStreams/IBlockOutputStream.h>
#include <Storages/AlterCommands.h>
#include <Storages/StorageFactory.h>
#include <Storages/ReadInOrderOptimizer.h>
#include <Common/typeid_cast.h>
#include <Processors/Sources/SourceFromInputStream.h>
namespace DB
{
namespace ErrorCodes
{
extern const int LOGICAL_ERROR;
extern const int INCORRECT_QUERY;
extern const int QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW;
}
static inline String generateInnerTableName(const String & table_name)
{
return ".inner." + table_name;
}
static StorageID extractDependentTableFromSelectQuery(ASTSelectQuery & query, const Context & context, bool add_default_db = true)
{
if (add_default_db)
{
AddDefaultDatabaseVisitor visitor(context.getCurrentDatabase(), nullptr);
visitor.visit(query);
}
if (auto db_and_table = getDatabaseAndTable(query, 0))
{
return StorageID(db_and_table->database, db_and_table->table/*, db_and_table->uuid*/);
}
else if (auto subquery = extractTableExpression(query, 0))
{
auto * ast_select = subquery->as<ASTSelectWithUnionQuery>();
if (!ast_select)
throw Exception("Logical error while creating StorageMaterializedView. "
"Could not retrieve table name from select query.",
DB::ErrorCodes::LOGICAL_ERROR);
if (ast_select->list_of_selects->children.size() != 1)
throw Exception("UNION is not supported for MATERIALIZED VIEW",
ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW);
auto & inner_query = ast_select->list_of_selects->children.at(0);
return extractDependentTableFromSelectQuery(inner_query->as<ASTSelectQuery &>(), context, false);
}
else
return StorageID::createEmpty();
}
static void checkAllowedQueries(const ASTSelectQuery & query)
{
if (query.prewhere() || query.final() || query.sample_size())
throw Exception("MATERIALIZED VIEW cannot have PREWHERE, SAMPLE or FINAL.", DB::ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW);
ASTPtr subquery = extractTableExpression(query, 0);
if (!subquery)
return;
if (const auto * ast_select = subquery->as<ASTSelectWithUnionQuery>())
{
if (ast_select->list_of_selects->children.size() != 1)
throw Exception("UNION is not supported for MATERIALIZED VIEW", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW);
const auto & inner_query = ast_select->list_of_selects->children.at(0);
checkAllowedQueries(inner_query->as<ASTSelectQuery &>());
}
}
StorageMaterializedView::StorageMaterializedView(
const StorageID & table_id_,
Context & local_context,
const ASTCreateQuery & query,
const ColumnsDescription & columns_,
bool attach_)
: IStorage(table_id_), global_context(local_context.getGlobalContext())
{
setColumns(columns_);
if (!query.select)
throw Exception("SELECT query is not specified for " + getName(), ErrorCodes::INCORRECT_QUERY);
/// If the destination table is not set, use inner table
has_inner_table = query.to_table.empty();
if (has_inner_table && !query.storage)
throw Exception(
"You must specify where to save results of a MaterializedView query: either ENGINE or an existing table in a TO clause",
ErrorCodes::INCORRECT_QUERY);
if (query.select->list_of_selects->children.size() != 1)
throw Exception("UNION is not supported for MATERIALIZED VIEW", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW);
select = query.select->clone();
inner_query = query.select->list_of_selects->children.at(0);
auto & select_query = inner_query->as<ASTSelectQuery &>();
checkAllowedQueries(select_query);
select_table_id = extractDependentTableFromSelectQuery(select_query, local_context);
if (!has_inner_table)
target_table_id = StorageID(query.to_database, query.to_table);
else if (attach_)
{
/// If there is an ATTACH request, then the internal table must already be created.
target_table_id = StorageID(getStorageID().database_name, generateInnerTableName(getStorageID().table_name));
}
else
{
/// We will create a query to create an internal table.
auto manual_create_query = std::make_shared<ASTCreateQuery>();
manual_create_query->database = getStorageID().database_name;
manual_create_query->table = generateInnerTableName(getStorageID().table_name);
auto new_columns_list = std::make_shared<ASTColumns>();
new_columns_list->set(new_columns_list->columns, query.columns_list->columns->ptr());
manual_create_query->set(manual_create_query->columns_list, new_columns_list);
manual_create_query->set(manual_create_query->storage, query.storage->ptr());
InterpreterCreateQuery create_interpreter(manual_create_query, local_context);
create_interpreter.setInternal(true);
create_interpreter.execute();
target_table_id = global_context.getTable(manual_create_query->database, manual_create_query->table)->getStorageID();
}
if (!select_table_id.empty())
global_context.addDependency(select_table_id, getStorageID());
}
NameAndTypePair StorageMaterializedView::getColumn(const String & column_name) const
{
return getTargetTable()->getColumn(column_name);
}
bool StorageMaterializedView::hasColumn(const String & column_name) const
{
return getTargetTable()->hasColumn(column_name);
}
StorageInMemoryMetadata StorageMaterializedView::getInMemoryMetadata() const
{
return
{
.columns = getColumns(),
.indices = getIndices(),
.constraints = getConstraints(),
.select = getSelectQuery(),
};
}
QueryProcessingStage::Enum StorageMaterializedView::getQueryProcessingStage(const Context & context) const
{
return getTargetTable()->getQueryProcessingStage(context);
}
Pipes StorageMaterializedView::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)
{
auto storage = getTargetTable();
auto lock = storage->lockStructureForShare(false, context.getCurrentQueryId());
if (query_info.order_by_optimizer)
query_info.input_sorting_info = query_info.order_by_optimizer->getInputOrder(storage);
Pipes pipes = storage->read(column_names, query_info, context, processed_stage, max_block_size, num_streams);
for (auto & pipe : pipes)
pipe.addTableLock(lock);
return pipes;
}
BlockOutputStreamPtr StorageMaterializedView::write(const ASTPtr & query, const Context & context)
{
auto storage = getTargetTable();
auto lock = storage->lockStructureForShare(true, context.getCurrentQueryId());
auto stream = storage->write(query, context);
stream->addTableLock(lock);
return stream;
}
static void executeDropQuery(ASTDropQuery::Kind kind, Context & global_context, const StorageID & target_table_id)
{
if (global_context.tryGetTable(target_table_id))
{
/// We create and execute `drop` query for internal table.
auto drop_query = std::make_shared<ASTDropQuery>();
drop_query->database = target_table_id.database_name;
drop_query->table = target_table_id.table_name;
drop_query->kind = kind;
ASTPtr ast_drop_query = drop_query;
InterpreterDropQuery drop_interpreter(ast_drop_query, global_context);
drop_interpreter.execute();
}
}
void StorageMaterializedView::drop(TableStructureWriteLockHolder &)
{
auto table_id = getStorageID();
if (!select_table_id.empty())
global_context.removeDependency(select_table_id, table_id);
if (has_inner_table && tryGetTargetTable())
executeDropQuery(ASTDropQuery::Kind::Drop, global_context, target_table_id);
}
void StorageMaterializedView::truncate(const ASTPtr &, const Context &, TableStructureWriteLockHolder &)
{
if (has_inner_table)
executeDropQuery(ASTDropQuery::Kind::Truncate, global_context, target_table_id);
}
void StorageMaterializedView::checkStatementCanBeForwarded() const
{
if (!has_inner_table)
throw Exception(
"MATERIALIZED VIEW targets existing table " + target_table_id.getNameForLogs() + ". "
+ "Execute the statement directly on it.", ErrorCodes::INCORRECT_QUERY);
}
bool StorageMaterializedView::optimize(const ASTPtr & query, const ASTPtr & partition, bool final, bool deduplicate, const Context & context)
{
checkStatementCanBeForwarded();
return getTargetTable()->optimize(query, partition, final, deduplicate, context);
}
void StorageMaterializedView::alter(
const AlterCommands & params,
const Context & context,
TableStructureWriteLockHolder & table_lock_holder)
{
lockStructureExclusively(table_lock_holder, context.getCurrentQueryId());
auto table_id = getStorageID();
StorageInMemoryMetadata metadata = getInMemoryMetadata();
params.apply(metadata);
/// start modify query
if (context.getSettingsRef().allow_experimental_alter_materialized_view_structure)
{
auto & new_select = metadata.select->as<ASTSelectWithUnionQuery &>();
if (new_select.list_of_selects->children.size() != 1)
throw Exception("UNION is not supported for MATERIALIZED VIEW", ErrorCodes::QUERY_IS_NOT_SUPPORTED_IN_MATERIALIZED_VIEW);
auto & new_inner_query = new_select.list_of_selects->children.at(0);
auto & select_query = new_inner_query->as<ASTSelectQuery &>();
checkAllowedQueries(select_query);
auto new_select_table_id = extractDependentTableFromSelectQuery(select_query, context);
{
auto context_lock = global_context.getLock();
if (!select_table_id.empty())
global_context.removeDependency(select_table_id, getStorageID());
if (!new_select_table_id.empty())
global_context.addDependency(new_select_table_id, getStorageID());
select_table_id = new_select_table_id;
select = metadata.select;
inner_query = new_inner_query;
}
}
/// end modify query
context.getDatabase(table_id.database_name)->alterTable(context, table_id.table_name, metadata);
setColumns(std::move(metadata.columns));
}
void StorageMaterializedView::checkAlterIsPossible(const AlterCommands & commands, const Settings & settings)
{
if (settings.allow_experimental_alter_materialized_view_structure)
{
for (const auto & command : commands)
{
if (!command.isCommentAlter() && command.type != AlterCommand::MODIFY_QUERY)
throw Exception(
"Alter of type '" + alterTypeToString(command.type) + "' is not supported by storage " + getName(),
ErrorCodes::NOT_IMPLEMENTED);
}
}
else
{
for (const auto & command : commands)
{
if (!command.isCommentAlter())
throw Exception(
"Alter of type '" + alterTypeToString(command.type) + "' is not supported by storage " + getName(),
ErrorCodes::NOT_IMPLEMENTED);
}
}
}
void StorageMaterializedView::alterPartition(const ASTPtr & query, const PartitionCommands &commands, const Context &context)
{
checkStatementCanBeForwarded();
getTargetTable()->alterPartition(query, commands, context);
}
void StorageMaterializedView::mutate(const MutationCommands & commands, const Context & context)
{
checkStatementCanBeForwarded();
getTargetTable()->mutate(commands, context);
}
void StorageMaterializedView::rename(
const String & /*new_path_to_db*/, const String & new_database_name, const String & new_table_name, TableStructureWriteLockHolder &)
{
if (has_inner_table && tryGetTargetTable())
{
auto new_target_table_name = generateInnerTableName(new_table_name);
auto rename = std::make_shared<ASTRenameQuery>();
ASTRenameQuery::Table from;
from.database = target_table_id.database_name;
from.table = target_table_id.table_name;
ASTRenameQuery::Table to;
to.database = target_table_id.database_name;
to.table = new_target_table_name;
ASTRenameQuery::Element elem;
elem.from = from;
elem.to = to;
rename->elements.emplace_back(elem);
InterpreterRenameQuery(rename, global_context).execute();
target_table_id.table_name = new_target_table_name;
}
auto lock = global_context.getLock();
if (!select_table_id.empty())
global_context.removeDependencyUnsafe(select_table_id, getStorageID());
IStorage::renameInMemory(new_database_name, new_table_name);
if (!select_table_id.empty())
global_context.addDependencyUnsafe(select_table_id, getStorageID());
}
void StorageMaterializedView::shutdown()
{
/// Make sure the dependency is removed after DETACH TABLE
if (!select_table_id.empty())
global_context.removeDependency(select_table_id, getStorageID());
}
StoragePtr StorageMaterializedView::getTargetTable() const
{
return global_context.getTable(target_table_id);
}
StoragePtr StorageMaterializedView::tryGetTargetTable() const
{
return global_context.tryGetTable(target_table_id);
}
Strings StorageMaterializedView::getDataPaths() const
{
if (auto table = tryGetTargetTable())
return table->getDataPaths();
return {};
}
void StorageMaterializedView::checkTableCanBeDropped() const
{
/// Don't drop the target table if it was created manually via 'TO inner_table' statement
if (!has_inner_table)
return;
auto target_table = tryGetTargetTable();
if (!target_table)
return;
target_table->checkTableCanBeDropped();
}
void StorageMaterializedView::checkPartitionCanBeDropped(const ASTPtr & partition)
{
/// Don't drop the partition in target table if it was created manually via 'TO inner_table' statement
if (!has_inner_table)
return;
auto target_table = tryGetTargetTable();
if (!target_table)
return;
target_table->checkPartitionCanBeDropped(partition);
}
ActionLock StorageMaterializedView::getActionLock(StorageActionBlockType type)
{
return has_inner_table ? getTargetTable()->getActionLock(type) : ActionLock{};
}
void registerStorageMaterializedView(StorageFactory & factory)
{
factory.registerStorage("MaterializedView", [](const StorageFactory::Arguments & args)
{
/// Pass local_context here to convey setting for inner table
return StorageMaterializedView::create(
args.table_id, args.local_context, args.query,
args.columns, args.attach);
});
}
}