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#include <TableFunctions/TableFunctionFactory.h>
#include <Interpreters/Context.h>
#include <Common/CurrentThread.h>
#include <Common/Exception.h>
#include <Common/KnownObjectNames.h>
#include <IO/WriteHelpers.h>
#include <Parsers/ASTFunction.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_FUNCTION;
extern const int LOGICAL_ERROR;
}
void TableFunctionFactory::registerFunction(
const std::string & name, Value value, CaseSensitiveness case_sensitiveness)
{
if (!table_functions.emplace(name, value).second)
throw Exception(ErrorCodes::LOGICAL_ERROR, "TableFunctionFactory: the table function name '{}' is not unique", name);
if (case_sensitiveness == CaseInsensitive
&& !case_insensitive_table_functions.emplace(Poco::toLower(name), value).second)
throw Exception(ErrorCodes::LOGICAL_ERROR, "TableFunctionFactory: "
"the case insensitive table function name '{}' is not unique", name);
KnownTableFunctionNames::instance().add(name, (case_sensitiveness == CaseInsensitive));
}
TableFunctionPtr TableFunctionFactory::get(
const ASTPtr & ast_function,
ContextPtr context) const
{
const auto * table_function = ast_function->as<ASTFunction>();
auto res = tryGet(table_function->name, context);
if (!res)
{
auto hints = getHints(table_function->name);
if (!hints.empty())
throw Exception(ErrorCodes::UNKNOWN_FUNCTION, "Unknown table function {}. Maybe you meant: {}", table_function->name, toString(hints));
else
throw Exception(ErrorCodes::UNKNOWN_FUNCTION, "Unknown table function {}", table_function->name);
}
res->parseArguments(ast_function, context);
return res;
}
TableFunctionPtr TableFunctionFactory::tryGet(
const std::string & name_param,
ContextPtr) const
{
String name = getAliasToOrName(name_param);
TableFunctionPtr res;
auto it = table_functions.find(name);
if (table_functions.end() != it)
{
res = it->second.creator();
}
else
{
it = case_insensitive_table_functions.find(Poco::toLower(name));
if (case_insensitive_table_functions.end() != it)
res = it->second.creator();
}
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::TableFunction, name);
}
return res;
}
bool TableFunctionFactory::isTableFunctionName(const std::string & name) const
{
return table_functions.contains(name);
}
std::optional<TableFunctionProperties> TableFunctionFactory::tryGetProperties(const String & name) const
{
return tryGetPropertiesImpl(name);
}
std::optional<TableFunctionProperties> TableFunctionFactory::tryGetPropertiesImpl(const String & name_param) const
{
String name = getAliasToOrName(name_param);
Value found;
/// Find by exact match.
if (auto it = table_functions.find(name); it != table_functions.end())
{
found = it->second;
}
if (auto jt = case_insensitive_table_functions.find(Poco::toLower(name)); jt != case_insensitive_table_functions.end())
found = jt->second;
if (found.creator)
return found.properties;
return {};
}
TableFunctionFactory & TableFunctionFactory::instance()
{
static TableFunctionFactory ret;
return ret;
}
}
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