bakaid commented on a change in pull request #732: MINIFICPP-1013 URL: https://github.com/apache/nifi-minifi-cpp/pull/732#discussion_r379325208
########## File path: extensions/sql/data/MaxCollector.h ########## @@ -0,0 +1,155 @@ +/** + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#pragma once + +#include <string> +#include <unordered_map> +#include <tuple> + +#include "SQLRowSubscriber.h" + +namespace org { +namespace apache { +namespace nifi { +namespace minifi { +namespace sql { + +class MaxCollector: public SQLRowSubscriber { + void beginProcessRow() override {} + + void endProcessRow() override { + if (columnsVerified_) { + return; + } + + if (countColumns_ != mapState_.size()) + throw minifi::Exception(PROCESSOR_EXCEPTION, "MaxCollector: Column(s) '" + maxValueColumnNames_ + "' are not found in the columns of '" + selectQuery_ + "' result."); + + columnsVerified_ = true; + } + + void processColumnName(const std::string& name) override { + if (columnsVerified_) { + return; + } + + if (mapState_.count(name)) { + countColumns_++; + } + } + + void processColumn(const std::string& name, const std::string& value) override { + updateMaxValue(name, '\'' + value + '\''); + } + + void processColumn(const std::string& name, double value) override { + updateMaxValue(name, value); + } + + void processColumn(const std::string& name, int value) override { + updateMaxValue(name, value); + } + + void processColumn(const std::string& name, long long value) override { + updateMaxValue(name, value); + } + + void processColumn(const std::string& name, unsigned long long value) override { + updateMaxValue(name, value); + } + + void processColumn(const std::string& name, const char* value) override {} + + template <typename T> + struct MaxValue { + void updateMaxValue(const std::string& name, const T& value) { + const auto it = mapColumnNameValue_.find(name); + if (it == mapColumnNameValue_.end()) { + mapColumnNameValue_.insert({ name, value }); + } else { + if (value > it->second) { + it->second = value; + } + } + } + + std::unordered_map<std::string, T> mapColumnNameValue_; + }; + + template <typename Tuple, int Index> + struct UpdateMapState { + UpdateMapState(const Tuple& tpl, std::unordered_map<std::string, std::string>& mapState) { + for (auto& el : mapState) { + const auto& maxVal = std::get<Index>(tpl); + + const auto it = maxVal.mapColumnNameValue_.find(el.first); + if (it != maxVal.mapColumnNameValue_.end()) { + std::stringstream ss; + ss << it->second; + el.second = ss.str(); + } + } + + UpdateMapState<Tuple, Index - 1>(tpl, mapState); Review comment: Build fails on macOS with: ``` /Users/danielbakai/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:109:40: error: cannot pass object of non-trivial type 'const org::apache::nifi::minifi::sql::MaxCollector::MaxValues<std::__1::basic_string<char>, double, int, long long, unsigned long long>' through variadic constructor; call will abort at runtime [-Wnon-pod-varargs] UpdateMapState<Tuple, Index - 1>(tpl, mapState); ^ ``` And on Linux with clang with: ``` In file included from /home/bakaid/nifi-minifi-cpp/extensions/sql/processors/QueryDatabaseTable.cpp:47: /home/bakaid/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:109:40: error: cannot pass object of non-trivial type 'const org::apache::nifi::minifi::sql::MaxCollector::MaxValues<std::__cxx11::basic_string<char>, double, int, long long, unsigned long long>' through variadic constructor; call will abort at runtime [-Wnon-pod-varargs] UpdateMapState<Tuple, Index - 1>(tpl, mapState); ^ /home/bakaid/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:109:7: note: in instantiation of member function 'org::apache::nifi::minifi::sql::MaxCollector::UpdateMapState<org::apache::nifi::minifi::sql::MaxCollector::MaxValues<std::__cxx11::basic_string<char>, double, int, long long, unsigned long long>, 0>::UpdateMapState' requested here UpdateMapState<Tuple, Index - 1>(tpl, mapState); ^ /home/bakaid/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:109:7: note: in instantiation of member function 'org::apache::nifi::minifi::sql::MaxCollector::UpdateMapState<org::apache::nifi::minifi::sql::MaxCollector::MaxValues<std::__cxx11::basic_string<char>, double, int, long long, unsigned long long>, 1>::UpdateMapState' requested here /home/bakaid/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:109:7: note: in instantiation of member function 'org::apache::nifi::minifi::sql::MaxCollector::UpdateMapState<org::apache::nifi::minifi::sql::MaxCollector::MaxValues<std::__cxx11::basic_string<char>, double, int, long long, unsigned long long>, 2>::UpdateMapState' requested here /home/bakaid/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:109:7: note: in instantiation of member function 'org::apache::nifi::minifi::sql::MaxCollector::UpdateMapState<org::apache::nifi::minifi::sql::MaxCollector::MaxValues<std::__cxx11::basic_string<char>, double, int, long long, unsigned long long>, 3>::UpdateMapState' requested here /home/bakaid/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:137:5: note: in instantiation of member function 'org::apache::nifi::minifi::sql::MaxCollector::UpdateMapState<org::apache::nifi::minifi::sql::MaxCollector::MaxValues<std::__cxx11::basic_string<char>, double, int, long long, unsigned long long>, 4>::UpdateMapState' requested here UpdateMapState<decltype(maxValues_), decltype(maxValues_)::size - 1>(maxValues_, mapState_); ^ /home/bakaid/nifi-minifi-cpp/extensions/sql/./data/MaxCollector.h:109:45: error: cannot pass object of non-trivial type 'std::unordered_map<std::string, std::string>' (aka 'unordered_map<basic_string<char>, basic_string<char> >') through variadic constructor; call will abort at runtime [-Wnon-pod-varargs] UpdateMapState<Tuple, Index - 1>(tpl, mapState); ^ 2 errors generated. extensions/sql/CMakeFiles/minifi-sql.dir/build.make:206: recipe for target 'extensions/sql/CMakeFiles/minifi-sql.dir/processors/QueryDatabaseTable.cpp.o' failed make[2]: *** [extensions/sql/CMakeFiles/minifi-sql.dir/processors/QueryDatabaseTable.cpp.o] Error 1 CMakeFiles/Makefile2:3863: recipe for target 'extensions/sql/CMakeFiles/minifi-sql.dir/all' failed ``` The changes introduced are not portable. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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