ClickHouse/dbms/src/Databases/DatabasesCommon.cpp

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#include <Databases/DatabasesCommon.h>
#include <Interpreters/InterpreterCreateQuery.h>
#include <Parsers/ParserCreateQuery.h>
#include <Parsers/formatAST.h>
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#include <Storages/StorageDictionary.h>
#include <Storages/StorageFactory.h>
#include <Common/typeid_cast.h>
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#include <TableFunctions/TableFunctionFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int TABLE_ALREADY_EXISTS;
extern const int UNKNOWN_TABLE;
}
DatabaseWithOwnTablesBase::DatabaseWithOwnTablesBase(const String & name_, const String & logger)
: IDatabase(name_), log(&Logger::get(logger))
{
}
bool DatabaseWithOwnTablesBase::isTableExist(
const Context & /*context*/,
const String & table_name) const
{
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std::lock_guard lock(mutex);
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return tables.find(table_name) != tables.end() || dictionaries.find(table_name) != dictionaries.end();
}
StoragePtr DatabaseWithOwnTablesBase::tryGetTable(
const Context & /*context*/,
const String & table_name) const
{
std::lock_guard lock(mutex);
auto it = tables.find(table_name);
if (it != tables.end())
return it->second;
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return {};
}
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DatabaseTablesIteratorPtr DatabaseWithOwnTablesBase::getTablesIterator(const Context & /*context*/, const FilterByNameFunction & filter_by_table_name)
{
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std::lock_guard lock(mutex);
if (!filter_by_table_name)
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return std::make_unique<DatabaseTablesSnapshotIterator>(tables);
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Tables filtered_tables;
for (const auto & [table_name, storage] : tables)
if (filter_by_table_name(table_name))
filtered_tables.emplace(table_name, storage);
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return std::make_unique<DatabaseTablesSnapshotIterator>(std::move(filtered_tables));
}
bool DatabaseWithOwnTablesBase::empty(const Context & /*context*/) const
{
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std::lock_guard lock(mutex);
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return tables.empty() && dictionaries.empty();
}
StoragePtr DatabaseWithOwnTablesBase::detachTable(const String & table_name)
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{
std::lock_guard lock(mutex);
return detachTableUnlocked(table_name);
}
StoragePtr DatabaseWithOwnTablesBase::detachTableUnlocked(const String & table_name)
{
StoragePtr res;
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if (dictionaries.count(table_name))
throw Exception("Cannot detach dictionary " + database_name + "." + table_name + " as table, use DETACH DICTIONARY query.", ErrorCodes::UNKNOWN_TABLE);
auto it = tables.find(table_name);
if (it == tables.end())
throw Exception("Table " + backQuote(database_name) + "." + backQuote(table_name) + " doesn't exist.", ErrorCodes::UNKNOWN_TABLE);
res = it->second;
tables.erase(it);
return res;
}
void DatabaseWithOwnTablesBase::attachTable(const String & table_name, const StoragePtr & table)
{
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std::lock_guard lock(mutex);
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attachTableUnlocked(table_name, table);
}
void DatabaseWithOwnTablesBase::attachTableUnlocked(const String & table_name, const StoragePtr & table)
{
if (!tables.emplace(table_name, table).second)
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throw Exception("Table " + database_name + "." + table_name + " already exists.", ErrorCodes::TABLE_ALREADY_EXISTS);
}
void DatabaseWithOwnTablesBase::shutdown()
{
/// You can not hold a lock during shutdown.
/// Because inside `shutdown` function tables can work with database, and mutex is not recursive.
Tables tables_snapshot;
{
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std::lock_guard lock(mutex);
tables_snapshot = tables;
}
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for (const auto & kv : tables_snapshot)
{
kv.second->shutdown();
}
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std::lock_guard lock(mutex);
tables.clear();
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dictionaries.clear();
}
DatabaseWithOwnTablesBase::~DatabaseWithOwnTablesBase()
{
try
{
DatabaseWithOwnTablesBase::shutdown();
}
catch (...)
{
tryLogCurrentException(__PRETTY_FUNCTION__);
}
}
}