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#include <Functions/FunctionFactory.h>
#include <Interpreters/Context.h>
#include <Common/Exception.h>
#include <Common/CurrentThread.h>
#include <Poco/String.h>
#include <IO/WriteHelpers.h>
#include <AggregateFunctions/AggregateFunctionFactory.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_FUNCTION;
extern const int LOGICAL_ERROR;
}
const String & getFunctionCanonicalNameIfAny(const String & name)
{
return FunctionFactory::instance().getCanonicalNameIfAny(name);
}
void FunctionFactory::registerFunction(
const std::string & name,
FunctionCreator creator,
FunctionDocumentation doc,
CaseSensitiveness case_sensitiveness)
{
if (!functions.emplace(name, FunctionFactoryData{creator, doc}).second)
throw Exception(ErrorCodes::LOGICAL_ERROR, "FunctionFactory: the function name '{}' is not unique", name);
String function_name_lowercase = Poco::toLower(name);
if (isAlias(name) || isAlias(function_name_lowercase))
throw Exception(ErrorCodes::LOGICAL_ERROR, "FunctionFactory: the function name '{}' is already registered as alias",
name);
if (case_sensitiveness == CaseInsensitive)
{
if (!case_insensitive_functions.emplace(function_name_lowercase, FunctionFactoryData{creator, doc}).second)
throw Exception(ErrorCodes::LOGICAL_ERROR, "FunctionFactory: the case insensitive function name '{}' is not unique",
name);
case_insensitive_name_mapping[function_name_lowercase] = name;
}
}
FunctionOverloadResolverPtr FunctionFactory::getImpl(
const std::string & name,
ContextPtr context) const
{
auto res = tryGetImpl(name, context);
if (!res)
{
String extra_info;
if (AggregateFunctionFactory::instance().hasNameOrAlias(name))
extra_info = ". There is an aggregate function with the same name, but ordinary function is expected here";
auto hints = this->getHints(name);
if (!hints.empty())
throw Exception(ErrorCodes::UNKNOWN_FUNCTION, "Unknown function {}{}. Maybe you meant: {}", name, extra_info, toString(hints));
else
throw Exception(ErrorCodes::UNKNOWN_FUNCTION, "Unknown function {}{}", name, extra_info);
}
return res;
}
std::vector<std::string> FunctionFactory::getAllNames() const
{
std::vector<std::string> res;
res.reserve(functions.size());
for (const auto & func : functions)
res.emplace_back(func.first);
return res;
}
FunctionOverloadResolverPtr FunctionFactory::get(
const std::string & name,
ContextPtr context) const
{
return getImpl(name, context);
}
bool FunctionFactory::has(const std::string & name) const
{
String canonical_name = getAliasToOrName(name);
if (functions.contains(canonical_name))
return true;
canonical_name = Poco::toLower(canonical_name);
return case_insensitive_functions.contains(canonical_name);
}
FunctionOverloadResolverPtr FunctionFactory::tryGetImpl(
const std::string & name_param,
ContextPtr context) const
{
String name = getAliasToOrName(name_param);
FunctionOverloadResolverPtr res;
auto it = functions.find(name);
if (functions.end() != it)
res = it->second.first(context);
else
{
name = Poco::toLower(name);
it = case_insensitive_functions.find(name);
if (case_insensitive_functions.end() != it)
res = it->second.first(context);
}
if (!res)
return nullptr;
if (CurrentThread::isInitialized())
{
auto query_context = CurrentThread::get().getQueryContext();
if (query_context && query_context->getSettingsRef().log_queries)
query_context->addQueryFactoriesInfo(Context::QueryLogFactories::Function, name);
}
return res;
}
FunctionOverloadResolverPtr FunctionFactory::tryGet(
const std::string & name,
ContextPtr context) const
{
auto impl = tryGetImpl(name, context);
return impl ? std::move(impl) : nullptr;
}
FunctionFactory & FunctionFactory::instance()
{
static FunctionFactory ret;
return ret;
}
FunctionDocumentation FunctionFactory::getDocumentation(const std::string & name) const
{
auto it = functions.find(name);
if (it == functions.end())
throw Exception(ErrorCodes::UNKNOWN_FUNCTION, "Unknown function {}", name);
return it->second.second;
}
}
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