mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-03 13:02:00 +00:00
212686c5c4
Basically `DATABASE()` and `SCHEMA()` are aliases in MySQL. This helps with allowing MySQL Shell to get one step closer to a functioning connection. To see what MySQL Shell does: ``` mysqlsh --verbose=4 --log-sql=unfiltered mysql://default@127.0.0.1:9004 ``` This might also bring other tools a step closer to working with the MySQL compatibility of ClickHouse. Ref: #9336 Signed-off-by: Daniël van Eeden <git@myname.nl>
63 lines
1.7 KiB
C++
63 lines
1.7 KiB
C++
#include <Functions/IFunction.h>
|
|
#include <Functions/FunctionFactory.h>
|
|
#include <Interpreters/Context.h>
|
|
#include <DataTypes/DataTypeString.h>
|
|
#include <Core/Field.h>
|
|
|
|
|
|
namespace DB
|
|
{
|
|
namespace
|
|
{
|
|
|
|
class FunctionCurrentDatabase : public IFunction
|
|
{
|
|
const String db_name;
|
|
|
|
public:
|
|
static constexpr auto name = "currentDatabase";
|
|
static FunctionPtr create(ContextPtr context)
|
|
{
|
|
return std::make_shared<FunctionCurrentDatabase>(context->getCurrentDatabase());
|
|
}
|
|
|
|
explicit FunctionCurrentDatabase(const String & db_name_) : db_name{db_name_}
|
|
{
|
|
}
|
|
|
|
String getName() const override
|
|
{
|
|
return name;
|
|
}
|
|
size_t getNumberOfArguments() const override
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
|
|
{
|
|
return std::make_shared<DataTypeString>();
|
|
}
|
|
|
|
bool isDeterministic() const override { return false; }
|
|
|
|
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
|
|
|
|
ColumnPtr executeImpl(const ColumnsWithTypeAndName &, const DataTypePtr &, size_t input_rows_count) const override
|
|
{
|
|
return DataTypeString().createColumnConst(input_rows_count, db_name);
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
REGISTER_FUNCTION(CurrentDatabase)
|
|
{
|
|
factory.registerFunction<FunctionCurrentDatabase>();
|
|
factory.registerAlias("DATABASE", FunctionCurrentDatabase::name, FunctionFactory::CaseInsensitive);
|
|
factory.registerAlias("SCHEMA", FunctionCurrentDatabase::name, FunctionFactory::CaseInsensitive);
|
|
factory.registerAlias("current_database", FunctionCurrentDatabase::name, FunctionFactory::CaseInsensitive);
|
|
}
|
|
|
|
}
|