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Pipeline: optimize part scan (#7723)
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2023 PingCAP, Ltd. | ||
| // | ||
| // Licensed 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 | ||
|
|
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| #include <Common/Exception.h> | ||
| #include <Flash/Pipeline/Exec/PipelineExec.h> | ||
| #include <Flash/Pipeline/Exec/PipelineExecBuilder.h> | ||
| #include <Operators/Operator.h> | ||
|
|
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| #include <memory> | ||
|
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| namespace DB | ||
| { | ||
| class SetBlockSinkOp : public SinkOp | ||
| { | ||
| public: | ||
| SetBlockSinkOp( | ||
| PipelineExecutorStatus & exec_status_, | ||
| const String & req_id, | ||
| Block & res_) | ||
| : SinkOp(exec_status_, req_id) | ||
| , res(res_) | ||
| { | ||
| } | ||
|
|
||
| String getName() const override | ||
| { | ||
| return "SetBlockSinkOp"; | ||
| } | ||
|
|
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| protected: | ||
| OperatorStatus writeImpl(Block && block) override | ||
| { | ||
| if unlikely (!block) | ||
| return OperatorStatus::FINISHED; | ||
|
|
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| assert(!res); | ||
| res = std::move(block); | ||
| return OperatorStatus::NEED_INPUT; | ||
| } | ||
|
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| private: | ||
| Block & res; | ||
| }; | ||
|
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| /// Used to merge multiple partitioned tables of storage layer. | ||
| class ConcatSourceOp : public SourceOp | ||
| { | ||
| public: | ||
| ConcatSourceOp( | ||
| PipelineExecutorStatus & exec_status_, | ||
| const String & req_id, | ||
| std::vector<PipelineExecBuilder> & exec_builder_pool) | ||
| : SourceOp(exec_status_, req_id) | ||
| { | ||
| RUNTIME_CHECK(!exec_builder_pool.empty()); | ||
| setHeader(exec_builder_pool.back().getCurrentHeader()); | ||
| for (auto & exec_builder : exec_builder_pool) | ||
| { | ||
| exec_builder.setSinkOp(std::make_unique<SetBlockSinkOp>(exec_status_, req_id, res)); | ||
| exec_pool.push_back(exec_builder.build()); | ||
| } | ||
| } | ||
|
|
||
| String getName() const override | ||
| { | ||
| return "ConcatSourceOp"; | ||
| } | ||
|
|
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| // ConcatSourceOp is used to merge multiple partitioned tables of storage layer, so override `getIOProfileInfo` is needed here. | ||
| IOProfileInfoPtr getIOProfileInfo() const override { return IOProfileInfo::createForLocal(profile_info_ptr); } | ||
|
|
||
| protected: | ||
| void operatePrefixImpl() override | ||
| { | ||
| if (!popExec()) | ||
| done = true; | ||
| } | ||
|
|
||
| void operateSuffixImpl() override | ||
| { | ||
| if (cur_exec) | ||
| { | ||
| cur_exec->executeSuffix(); | ||
| cur_exec.reset(); | ||
| } | ||
| exec_pool.clear(); | ||
| } | ||
|
|
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| OperatorStatus readImpl(Block & block) override | ||
| { | ||
| if unlikely (done) | ||
| return OperatorStatus::HAS_OUTPUT; | ||
|
|
||
| if unlikely (res) | ||
| { | ||
| std::swap(block, res); | ||
| return OperatorStatus::HAS_OUTPUT; | ||
| } | ||
|
|
||
| while (true) | ||
| { | ||
| assert(cur_exec); | ||
| auto status = cur_exec->execute(); | ||
| switch (status) | ||
| { | ||
| case OperatorStatus::NEED_INPUT: | ||
| assert(res); | ||
| std::swap(block, res); | ||
| return OperatorStatus::HAS_OUTPUT; | ||
| case OperatorStatus::FINISHED: | ||
| cur_exec->executeSuffix(); | ||
| cur_exec.reset(); | ||
| if (!popExec()) | ||
| { | ||
| done = true; | ||
| return OperatorStatus::HAS_OUTPUT; | ||
| } | ||
| break; | ||
| default: | ||
| return status; | ||
| } | ||
| } | ||
| } | ||
|
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| OperatorStatus executeIOImpl() override | ||
| { | ||
| if unlikely (done || res) | ||
| return OperatorStatus::HAS_OUTPUT; | ||
|
|
||
| assert(cur_exec); | ||
| auto status = cur_exec->executeIO(); | ||
| assert(status != OperatorStatus::FINISHED); | ||
| return status; | ||
| } | ||
|
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| OperatorStatus awaitImpl() override | ||
| { | ||
| if unlikely (done || res) | ||
| return OperatorStatus::HAS_OUTPUT; | ||
|
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| assert(cur_exec); | ||
| auto status = cur_exec->await(); | ||
| assert(status != OperatorStatus::FINISHED); | ||
| return status; | ||
| } | ||
|
|
||
| private: | ||
| bool popExec() | ||
| { | ||
| assert(!cur_exec); | ||
| if (exec_pool.empty()) | ||
| { | ||
| return false; | ||
| } | ||
| else | ||
| { | ||
| cur_exec = std::move(exec_pool.front()); | ||
| exec_pool.pop_front(); | ||
| cur_exec->executePrefix(); | ||
| return true; | ||
| } | ||
| } | ||
|
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| private: | ||
| std::deque<PipelineExecPtr> exec_pool; | ||
| PipelineExecPtr cur_exec; | ||
|
|
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| Block res; | ||
| bool done = false; | ||
| }; | ||
|
|
||
| class ConcatBuilderPool | ||
| { | ||
| public: | ||
| explicit ConcatBuilderPool(size_t expect_size) | ||
| { | ||
| RUNTIME_CHECK(expect_size > 0); | ||
| pool.resize(expect_size); | ||
| } | ||
|
|
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| void add(PipelineExecGroupBuilder & group_builder) | ||
| { | ||
| RUNTIME_CHECK(group_builder.groupCnt() == 1); | ||
| for (size_t i = 0; i < group_builder.concurrency(); ++i) | ||
| { | ||
| pool[pre_index++].push_back(std::move(group_builder.getCurBuilder(i))); | ||
| if (pre_index == pool.size()) | ||
| pre_index = 0; | ||
| } | ||
| } | ||
|
|
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| void generate(PipelineExecGroupBuilder & result_builder, PipelineExecutorStatus & exec_status, const String & req_id) | ||
| { | ||
| RUNTIME_CHECK(result_builder.empty()); | ||
| for (auto & builders : pool) | ||
| { | ||
| if (builders.empty()) | ||
| { | ||
| continue; | ||
| } | ||
| else if (builders.size() == 1) | ||
| { | ||
| result_builder.addConcurrency(std::move(builders.back())); | ||
| } | ||
| else | ||
| { | ||
| result_builder.addConcurrency(std::make_unique<ConcatSourceOp>(exec_status, req_id, builders)); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private: | ||
| std::vector<std::vector<PipelineExecBuilder>> pool; | ||
| size_t pre_index = 0; | ||
| }; | ||
| } // namespace DB |
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