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87 lines
3.1 KiB
C++
87 lines
3.1 KiB
C++
#include <Interpreters/InterpreterCreateFunctionQuery.h>
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#include <Access/ContextAccess.h>
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#include <Interpreters/Context.h>
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#include <Interpreters/ExpressionActions.h>
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#include <Interpreters/ExpressionAnalyzer.h>
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#include <Interpreters/FunctionNameNormalizer.h>
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#include <Interpreters/UserDefinedSQLFunctionFactory.h>
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#include <Interpreters/UserDefinedSQLObjectsLoader.h>
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#include <Interpreters/executeDDLQueryOnCluster.h>
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#include <Parsers/ASTCreateFunctionQuery.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTIdentifier.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int CANNOT_CREATE_RECURSIVE_FUNCTION;
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extern const int UNSUPPORTED_METHOD;
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}
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BlockIO InterpreterCreateFunctionQuery::execute()
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{
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FunctionNameNormalizer().visit(query_ptr.get());
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ASTCreateFunctionQuery & create_function_query = query_ptr->as<ASTCreateFunctionQuery &>();
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AccessRightsElements access_rights_elements;
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access_rights_elements.emplace_back(AccessType::CREATE_FUNCTION);
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if (create_function_query.or_replace)
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access_rights_elements.emplace_back(AccessType::DROP_FUNCTION);
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if (!create_function_query.cluster.empty())
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return executeDDLQueryOnCluster(query_ptr, getContext(), access_rights_elements);
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auto current_context = getContext();
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current_context->checkAccess(access_rights_elements);
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auto & user_defined_function_factory = UserDefinedSQLFunctionFactory::instance();
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auto & function_name = create_function_query.function_name;
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bool if_not_exists = create_function_query.if_not_exists;
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bool replace = create_function_query.or_replace;
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create_function_query.if_not_exists = false;
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create_function_query.or_replace = false;
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validateFunction(create_function_query.function_core, function_name);
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user_defined_function_factory.registerFunction(current_context, function_name, query_ptr, replace, if_not_exists, persist_function);
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return {};
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}
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void InterpreterCreateFunctionQuery::validateFunction(ASTPtr function, const String & name)
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{
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const auto * args_tuple = function->as<ASTFunction>()->arguments->children.at(0)->as<ASTFunction>();
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std::unordered_set<String> arguments;
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for (const auto & argument : args_tuple->arguments->children)
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{
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const auto & argument_name = argument->as<ASTIdentifier>()->name();
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auto [_, inserted] = arguments.insert(argument_name);
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if (!inserted)
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throw Exception(ErrorCodes::UNSUPPORTED_METHOD, "Identifier {} already used as function parameter", argument_name);
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}
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ASTPtr function_body = function->as<ASTFunction>()->children.at(0)->children.at(1);
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validateFunctionRecursiveness(function_body, name);
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}
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void InterpreterCreateFunctionQuery::validateFunctionRecursiveness(ASTPtr node, const String & function_to_create)
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{
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for (const auto & child : node->children)
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{
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auto function_name_opt = tryGetFunctionName(child);
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if (function_name_opt && function_name_opt.value() == function_to_create)
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throw Exception(ErrorCodes::CANNOT_CREATE_RECURSIVE_FUNCTION, "You cannot create recursive function");
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validateFunctionRecursiveness(child, function_to_create);
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}
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}
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}
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