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Support _state/_union/_merge aggregate funciton combinator
Signed-off-by: shuming.li <[email protected]>
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| // Copyright 2021-present StarRocks, Inc. All rights reserved. | ||
| // | ||
| // 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 | ||
| // | ||
| // https://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. | ||
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| #pragma once | ||
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| #include "column/vectorized_fwd.h" | ||
| #include "exprs/agg/aggregate.h" | ||
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| namespace starrocks { | ||
| struct AggStateMergeState {}; | ||
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| /** | ||
| * @brief Merge combinator for aggregate function to merge the agg state to return the final result of aggregate function. | ||
| * DESC: return_type {agg_func}_merge(immediate_type) | ||
| * input type : aggregate function's immediate_type | ||
| * intermediate type : aggregate function's immediate_type | ||
| * return type : aggregate function's return type | ||
| */ | ||
| class AggStateMerge final : public AggregateFunctionBatchHelper<AggStateMergeState, AggStateMerge> { | ||
| public: | ||
| AggStateMerge(AggStateDesc agg_state_desc, const AggregateFunction* function) | ||
| : _agg_state_desc(std::move(agg_state_desc)), _function(function) { | ||
| DCHECK(_function != nullptr); | ||
| } | ||
| const AggStateDesc* get_agg_state_desc() const { return &_agg_state_desc; } | ||
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| void create(FunctionContext* ctx, AggDataPtr __restrict ptr) const override { _function->create(ctx, ptr); } | ||
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| void destroy(FunctionContext* ctx, AggDataPtr __restrict ptr) const override { _function->destroy(ctx, ptr); } | ||
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| size_t size() const override { return _function->size(); } | ||
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| size_t alignof_size() const override { return _function->alignof_size(); } | ||
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| bool is_pod_state() const override { return _function->is_pod_state(); } | ||
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| void reset(FunctionContext* ctx, const Columns& args, AggDataPtr state) const override { | ||
| _function->reset(ctx, args, state); | ||
| } | ||
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| void update(FunctionContext* ctx, const Column** columns, AggDataPtr __restrict state, | ||
| size_t row_num) const override { | ||
| _function->merge(ctx, columns[0], state, row_num); | ||
| } | ||
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| void merge(FunctionContext* ctx, const Column* column, AggDataPtr __restrict state, size_t row_num) const override { | ||
| _function->merge(ctx, column, state, row_num); | ||
| } | ||
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| void get_values(FunctionContext* ctx, ConstAggDataPtr __restrict state, Column* dst, size_t start, | ||
| size_t end) const override { | ||
| DCHECK_GT(end, start); | ||
| _function->get_values(ctx, state, dst, start, end); | ||
| } | ||
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| void serialize_to_column([[maybe_unused]] FunctionContext* ctx, ConstAggDataPtr __restrict state, | ||
| Column* to) const override { | ||
| _function->serialize_to_column(ctx, state, to); | ||
| } | ||
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| void convert_to_serialize_format([[maybe_unused]] FunctionContext* ctx, const Columns& srcs, size_t chunk_size, | ||
| ColumnPtr* dst) const override { | ||
| DCHECK_EQ(1, srcs.size()); | ||
| *dst = srcs[0]; | ||
| } | ||
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| void finalize_to_column(FunctionContext* ctx __attribute__((unused)), ConstAggDataPtr __restrict state, | ||
| Column* to) const override { | ||
| _function->finalize_to_column(ctx, state, to); | ||
| } | ||
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| std::string get_name() const override { return "agg_state_merge"; } | ||
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| private: | ||
| const AggStateDesc _agg_state_desc; | ||
| const AggregateFunction* _function; | ||
| }; | ||
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| } // namespace starrocks |
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