ClickHouse/dbms/Functions/currentUser.cpp

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#include <Functions/IFunctionImpl.h>
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#include <Functions/FunctionFactory.h>
#include <Interpreters/Context.h>
#include <DataTypes/DataTypeString.h>
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#include <Core/Field.h>
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namespace DB
{
class FunctionCurrentUser : public IFunction
{
const String user_name;
public:
static constexpr auto name = "currentUser";
static FunctionPtr create(const Context & context)
{
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return std::make_shared<FunctionCurrentUser>(context.getClientInfo().initial_user);
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}
explicit FunctionCurrentUser(const String & user_name_) : user_name{user_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; }
void executeImpl(Block & block, const ColumnNumbers &, size_t result, size_t input_rows_count) override
{
block.getByPosition(result).column = DataTypeString().createColumnConst(input_rows_count, user_name);
}
};
void registerFunctionCurrentUser(FunctionFactory & factory)
{
factory.registerFunction<FunctionCurrentUser>();
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factory.registerAlias("user", FunctionCurrentUser::name, FunctionFactory::CaseInsensitive);
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}
}