ClickHouse/src/Interpreters/InterpreterCreateFunctionQuery.cpp

118 lines
4.0 KiB
C++
Raw Normal View History

2021-07-19 23:34:04 +00:00
#include <Access/ContextAccess.h>
2021-08-23 14:31:58 +00:00
#include <Parsers/ASTCreateFunctionQuery.h>
#include <Parsers/ASTIdentifier.h>
2021-07-19 23:34:04 +00:00
#include <Interpreters/Context.h>
#include <Interpreters/ExpressionActions.h>
#include <Interpreters/ExpressionAnalyzer.h>
#include <Interpreters/InterpreterCreateFunctionQuery.h>
#include <Interpreters/FunctionNameNormalizer.h>
2021-08-18 09:29:52 +00:00
#include <Interpreters/UserDefinedObjectsLoader.h>
#include <Interpreters/UserDefinedFunctionFactory.h>
2021-08-23 14:31:58 +00:00
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_IDENTIFIER;
extern const int CANNOT_CREATE_RECURSIVE_FUNCTION;
extern const int UNSUPPORTED_METHOD;
}
BlockIO InterpreterCreateFunctionQuery::execute()
{
2021-08-24 16:13:38 +00:00
auto current_context = getContext();
current_context->checkAccess(AccessType::CREATE_FUNCTION);
2021-08-23 14:31:58 +00:00
FunctionNameNormalizer().visit(query_ptr.get());
2021-08-18 09:29:52 +00:00
auto * create_function_query = query_ptr->as<ASTCreateFunctionQuery>();
if (!create_function_query)
throw Exception(ErrorCodes::UNSUPPORTED_METHOD, "Expected CREATE FUNCTION query");
2021-08-18 09:29:52 +00:00
auto & function_name = create_function_query->function_name;
validateFunction(create_function_query->function_core, function_name);
UserDefinedFunctionFactory::instance().registerFunction(function_name, query_ptr);
if (!is_internal)
{
try
{
2021-08-24 16:13:38 +00:00
UserDefinedObjectsLoader::instance().storeObject(current_context, UserDefinedObjectType::Function, function_name, *query_ptr);
}
2021-08-23 14:31:58 +00:00
catch (Exception & exception)
{
UserDefinedFunctionFactory::instance().unregisterFunction(function_name);
2021-08-23 14:31:58 +00:00
exception.addMessage(fmt::format("while storing user defined function {} on disk", backQuote(function_name)));
throw;
}
}
2021-08-18 09:29:52 +00:00
return {};
}
void InterpreterCreateFunctionQuery::validateFunction(ASTPtr function, const String & name)
{
const auto * args_tuple = function->as<ASTFunction>()->arguments->children.at(0)->as<ASTFunction>();
std::unordered_set<String> arguments;
for (const auto & argument : args_tuple->arguments->children)
{
const auto & argument_name = argument->as<ASTIdentifier>()->name();
auto [_, inserted] = arguments.insert(argument_name);
if (!inserted)
throw Exception(ErrorCodes::UNSUPPORTED_METHOD, "Identifier {} already used as function parameter", argument_name);
}
ASTPtr function_body = function->as<ASTFunction>()->children.at(0)->children.at(1);
std::unordered_set<String> identifiers_in_body = getIdentifiers(function_body);
for (const auto & identifier : identifiers_in_body)
{
if (!arguments.contains(identifier))
2021-08-18 09:29:52 +00:00
throw Exception(ErrorCodes::UNKNOWN_IDENTIFIER, "Identifier {} does not exist in arguments", backQuote(identifier));
}
validateFunctionRecursiveness(function_body, name);
}
std::unordered_set<String> InterpreterCreateFunctionQuery::getIdentifiers(ASTPtr node)
{
std::unordered_set<String> identifiers;
std::stack<ASTPtr> ast_nodes_to_process;
ast_nodes_to_process.push(node);
while (!ast_nodes_to_process.empty())
{
auto ast_node_to_process = ast_nodes_to_process.top();
ast_nodes_to_process.pop();
for (const auto & child : ast_node_to_process->children)
{
auto identifier_name_opt = tryGetIdentifierName(child);
if (identifier_name_opt)
identifiers.insert(identifier_name_opt.value());
ast_nodes_to_process.push(child);
}
}
return identifiers;
}
void InterpreterCreateFunctionQuery::validateFunctionRecursiveness(ASTPtr node, const String & function_to_create)
{
for (const auto & child : node->children)
{
auto function_name_opt = tryGetFunctionName(child);
if (function_name_opt && function_name_opt.value() == function_to_create)
2021-08-18 09:29:52 +00:00
throw Exception(ErrorCodes::CANNOT_CREATE_RECURSIVE_FUNCTION, "You cannot create recursive function");
validateFunctionRecursiveness(child, function_to_create);
}
}
}