ClickHouse/src/Interpreters/InterpreterDropQuery.cpp

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#include <Poco/File.h>
#include <Databases/IDatabase.h>
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#include <Interpreters/Context.h>
#include <Interpreters/DDLWorker.h>
#include <Interpreters/InterpreterDropQuery.h>
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#include <Interpreters/ExternalDictionariesLoader.h>
#include <Access/AccessRightsElement.h>
#include <Parsers/ASTDropQuery.h>
#include <Storages/IStorage.h>
#include <Common/escapeForFileName.h>
#include <Common/quoteString.h>
#include <Common/typeid_cast.h>
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#include <Databases/DatabaseAtomic.h>
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namespace DB
{
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namespace ErrorCodes
{
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extern const int LOGICAL_ERROR;
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extern const int SYNTAX_ERROR;
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extern const int UNKNOWN_TABLE;
extern const int UNKNOWN_DICTIONARY;
}
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static DatabasePtr tryGetDatabase(const String & database_name, bool if_exists)
{
return if_exists ? DatabaseCatalog::instance().tryGetDatabase(database_name) : DatabaseCatalog::instance().getDatabase(database_name);
}
InterpreterDropQuery::InterpreterDropQuery(const ASTPtr & query_ptr_, Context & context_) : query_ptr(query_ptr_), context(context_) {}
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BlockIO InterpreterDropQuery::execute()
{
auto & drop = query_ptr->as<ASTDropQuery &>();
if (!drop.cluster.empty())
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return executeDDLQueryOnCluster(query_ptr, context, getRequiredAccessForDDLOnCluster());
if (!drop.table.empty())
{
if (!drop.is_dictionary)
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return executeToTable({drop.database, drop.table, drop.uuid}, drop);
else
return executeToDictionary(drop.database, drop.table, drop.kind, drop.if_exists, drop.temporary, drop.no_ddl_lock);
}
else if (!drop.database.empty())
return executeToDatabase(drop.database, drop.kind, drop.if_exists);
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else
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throw Exception("Nothing to drop, both names are empty", ErrorCodes::LOGICAL_ERROR);
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}
BlockIO InterpreterDropQuery::executeToTable(
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const StorageID & table_id_,
const ASTDropQuery & query)
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{
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if (query.temporary || table_id_.database_name.empty())
{
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if (context.tryResolveStorageID(table_id_, Context::ResolveExternal))
return executeToTemporaryTable(table_id_.getTableName(), query.kind);
}
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if (query.temporary)
{
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if (query.if_exists)
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return {};
throw Exception("Temporary table " + backQuoteIfNeed(table_id_.table_name) + " doesn't exist",
ErrorCodes::UNKNOWN_TABLE);
}
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/// If table was already dropped by anyone, an exception will be thrown
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auto table_id = query.if_exists ? context.tryResolveStorageID(table_id_, Context::ResolveOrdinary)
: context.resolveStorageID(table_id_, Context::ResolveOrdinary);
if (!table_id)
return {};
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auto ddl_guard = (!query.no_ddl_lock ? DatabaseCatalog::instance().getDDLGuard(table_id.database_name, table_id.table_name) : nullptr);
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auto [database, table] = DatabaseCatalog::instance().getDatabaseAndTable(table_id);
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if (database && table)
{
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if (query_ptr->as<ASTDropQuery &>().is_view && !table->isView())
throw Exception("Table " + table_id.getNameForLogs() + " is not a View", ErrorCodes::LOGICAL_ERROR);
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if (query.kind == ASTDropQuery::Kind::Detach)
{
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context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
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table->shutdown();
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TableStructureWriteLockHolder table_lock;
if (database->getEngineName() != "Atomic")
table_lock = table->lockExclusively(context.getCurrentQueryId());
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/// Drop table from memory, don't touch data and metadata
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database->detachTable(table_id.table_name);
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}
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else if (query.kind == ASTDropQuery::Kind::Truncate)
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{
context.checkAccess(AccessType::TRUNCATE, table_id);
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table->checkTableCanBeDropped();
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auto table_lock = table->lockExclusively(context.getCurrentQueryId());
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/// Drop table data, don't touch metadata
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table->truncate(query_ptr, context, table_lock);
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}
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else if (query.kind == ASTDropQuery::Kind::Drop)
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{
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context.checkAccess(table->isView() ? AccessType::DROP_VIEW : AccessType::DROP_TABLE, table_id);
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table->checkTableCanBeDropped();
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table->shutdown();
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TableStructureWriteLockHolder table_lock;
if (database->getEngineName() != "Atomic")
table_lock = table->lockExclusively(context.getCurrentQueryId());
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database->dropTable(context, table_id.table_name, query.no_delay);
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}
}
return {};
}
BlockIO InterpreterDropQuery::executeToDictionary(
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const String & database_name_,
const String & dictionary_name,
ASTDropQuery::Kind kind,
bool if_exists,
bool is_temporary,
bool no_ddl_lock)
{
if (is_temporary)
throw Exception("Temporary dictionaries are not possible.", ErrorCodes::SYNTAX_ERROR);
String database_name = context.resolveDatabase(database_name_);
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auto ddl_guard = (!no_ddl_lock ? DatabaseCatalog::instance().getDDLGuard(database_name, dictionary_name) : nullptr);
DatabasePtr database = tryGetDatabase(database_name, if_exists);
if (!database || !database->isDictionaryExist(context, dictionary_name))
{
if (!if_exists)
throw Exception(
"Dictionary " + backQuoteIfNeed(database_name) + "." + backQuoteIfNeed(dictionary_name) + " doesn't exist.",
ErrorCodes::UNKNOWN_DICTIONARY);
else
return {};
}
if (kind == ASTDropQuery::Kind::Detach)
{
/// Drop dictionary from memory, don't touch data and metadata
context.checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
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database->detachDictionary(dictionary_name, context);
}
else if (kind == ASTDropQuery::Kind::Truncate)
{
throw Exception("Cannot TRUNCATE dictionary", ErrorCodes::SYNTAX_ERROR);
}
else if (kind == ASTDropQuery::Kind::Drop)
{
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context.checkAccess(AccessType::DROP_DICTIONARY, database_name, dictionary_name);
database->removeDictionary(context, dictionary_name);
}
return {};
}
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BlockIO InterpreterDropQuery::executeToTemporaryTable(const String & table_name, ASTDropQuery::Kind kind)
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{
if (kind == ASTDropQuery::Kind::Detach)
throw Exception("Unable to detach temporary table.", ErrorCodes::SYNTAX_ERROR);
else
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{
auto & context_handle = context.hasSessionContext() ? context.getSessionContext() : context;
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auto resolved_id = context_handle.tryResolveStorageID(StorageID("", table_name), Context::ResolveExternal);
if (resolved_id)
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{
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StoragePtr table = DatabaseCatalog::instance().getTable(resolved_id);
if (kind == ASTDropQuery::Kind::Truncate)
{
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auto table_lock = table->lockExclusively(context.getCurrentQueryId());
/// Drop table data, don't touch metadata
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table->truncate(query_ptr, context, table_lock);
}
else if (kind == ASTDropQuery::Kind::Drop)
{
context_handle.removeExternalTable(table_name);
table->shutdown();
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auto table_lock = table->lockExclusively(context.getCurrentQueryId());
/// Delete table data
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table->drop();
table->is_dropped = true;
}
}
}
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return {};
}
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BlockIO InterpreterDropQuery::executeToDatabase(const String & database_name, ASTDropQuery::Kind kind, bool if_exists)
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{
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auto ddl_guard = DatabaseCatalog::instance().getDDLGuard(database_name, "");
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if (auto database = tryGetDatabase(database_name, if_exists))
{
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if (kind == ASTDropQuery::Kind::Truncate)
{
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throw Exception("Unable to truncate database", ErrorCodes::SYNTAX_ERROR);
}
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else if (kind == ASTDropQuery::Kind::Detach || kind == ASTDropQuery::Kind::Drop)
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{
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bool drop = kind == ASTDropQuery::Kind::Drop;
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context.checkAccess(AccessType::DROP_DATABASE, database_name);
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/// DETACH or DROP all tables and dictionaries inside database
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ASTDropQuery query;
query.kind = kind;
query.database = database_name;
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for (auto iterator = database->getTablesIterator(); iterator->isValid(); iterator->next())
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{
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query.table = iterator->name();
executeToTable({query.database, query.table}, query);
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}
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for (auto iterator = database->getDictionariesIterator(); iterator->isValid(); iterator->next())
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{
String current_dictionary = iterator->name();
executeToDictionary(database_name, current_dictionary, kind, false, false, false);
}
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auto database_atomic = typeid_cast<DatabaseAtomic *>(database.get());
if (!drop && database_atomic)
database_atomic->assertCanBeDetached(true);
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/// DETACH or DROP database itself
DatabaseCatalog::instance().detachDatabase(database_name, drop);
}
}
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return {};
}
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AccessRightsElements InterpreterDropQuery::getRequiredAccessForDDLOnCluster() const
{
AccessRightsElements required_access;
const auto & drop = query_ptr->as<const ASTDropQuery &>();
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if (drop.table.empty())
{
if (drop.kind == ASTDropQuery::Kind::Detach)
required_access.emplace_back(AccessType::DROP_DATABASE, drop.database);
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else if (drop.kind == ASTDropQuery::Kind::Drop)
required_access.emplace_back(AccessType::DROP_DATABASE, drop.database);
}
else if (drop.is_dictionary)
{
if (drop.kind == ASTDropQuery::Kind::Detach)
required_access.emplace_back(AccessType::DROP_DICTIONARY, drop.database, drop.table);
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else if (drop.kind == ASTDropQuery::Kind::Drop)
required_access.emplace_back(AccessType::DROP_DICTIONARY, drop.database, drop.table);
}
else if (!drop.temporary)
{
/// It can be view or table.
if (drop.kind == ASTDropQuery::Kind::Drop)
required_access.emplace_back(AccessType::DROP_TABLE | AccessType::DROP_VIEW, drop.database, drop.table);
else if (drop.kind == ASTDropQuery::Kind::Truncate)
required_access.emplace_back(AccessType::TRUNCATE, drop.database, drop.table);
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else if (drop.kind == ASTDropQuery::Kind::Detach)
required_access.emplace_back(AccessType::DROP_TABLE | AccessType::DROP_VIEW, drop.database, drop.table);
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}
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return required_access;
}
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}