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#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);
}
}
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