diff options
Diffstat (limited to 'src/mongo/db/exec/sbe/stages/branch.h')
| -rw-r--r-- | src/mongo/db/exec/sbe/stages/branch.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/src/mongo/db/exec/sbe/stages/branch.h b/src/mongo/db/exec/sbe/stages/branch.h new file mode 100644 index 00000000000..9d9005e6d9f --- /dev/null +++ b/src/mongo/db/exec/sbe/stages/branch.h @@ -0,0 +1,80 @@ +/** + * Copyright (C) 2019-present MongoDB, Inc. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the Server Side Public License, version 1, + * as published by MongoDB, Inc. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * Server Side Public License for more details. + * + * You should have received a copy of the Server Side Public License + * along with this program. If not, see + * <http://www.mongodb.com/licensing/server-side-public-license>. + * + * As a special exception, the copyright holders give permission to link the + * code of portions of this program with the OpenSSL library under certain + * conditions as described in each individual source file and distribute + * linked combinations including the program with the OpenSSL library. You + * must comply with the Server Side Public License in all respects for + * all of the code used other than as permitted herein. If you modify file(s) + * with this exception, you may extend this exception to your version of the + * file(s), but you are not obligated to do so. If you do not wish to do so, + * delete this exception statement from your version. If you delete this + * exception statement from all source files in the program, then also delete + * it in the license file. + */ + +#pragma once + +#include "mongo/db/exec/sbe/expressions/expression.h" +#include "mongo/db/exec/sbe/stages/stages.h" +#include "mongo/db/exec/sbe/vm/vm.h" + +namespace mongo::sbe { +/** + * This stage delivers results from either 'then' or 'else' branch depending on the value of the + * 'filer' expression as evaluated during the open() call. + */ +class BranchStage final : public PlanStage { +public: + BranchStage(std::unique_ptr<PlanStage> inputThen, + std::unique_ptr<PlanStage> inputElse, + std::unique_ptr<EExpression> filter, + value::SlotVector inputThenVals, + value::SlotVector inputElseVals, + value::SlotVector outputVals); + + std::unique_ptr<PlanStage> clone() const final; + + void prepare(CompileCtx& ctx) final; + value::SlotAccessor* getAccessor(CompileCtx& ctx, value::SlotId slot) final; + void open(bool reOpen) final; + PlanState getNext() final; + void close() final; + + std::unique_ptr<PlanStageStats> getStats() const final; + const SpecificStats* getSpecificStats() const final; + std::vector<DebugPrinter::Block> debugPrint() const final; + +private: + const std::unique_ptr<EExpression> _filter; + const value::SlotVector _inputThenVals; + const value::SlotVector _inputElseVals; + const value::SlotVector _outputVals; + std::unique_ptr<vm::CodeFragment> _filterCode; + + std::vector<value::SlotAccessor*> _inputThenAccessors; + std::vector<value::SlotAccessor*> _inputElseAccessors; + std::vector<value::ViewOfValueAccessor> _outValueAccessors; + + boost::optional<int> _activeBranch; + bool _thenOpened{false}; + bool _elseOpened{false}; + + vm::ByteCode _bytecode; + FilterStats _specificStats; +}; +} // namespace mongo::sbe
\ No newline at end of file |