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[Enhancement] Support aggregate function map_agg.
Signed-off-by: Song Jiacheng <[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 <fmt/format.h> | ||
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| #include "column/binary_column.h" | ||
| #include "column/column.h" | ||
| #include "column/column_helper.h" | ||
| #include "column/fixed_length_column.h" | ||
| #include "column/hash_set.h" | ||
| #include "column/map_column.h" | ||
| #include "column/type_traits.h" | ||
| #include "exprs/agg/aggregate.h" | ||
| #include "exprs/function_context.h" | ||
| #include "gutil/casts.h" | ||
| #include "util/phmap/phmap.h" | ||
| #include "util/time.h" | ||
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| namespace starrocks { | ||
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| template <LogicalType KT, typename MyHashMap = std::map<int, size_t>> | ||
| struct MapAggAggregateFunctionState : public AggregateFunctionEmptyState { | ||
| using KeyColumnType = RunTimeColumnType<KT>; | ||
| using KeyType = typename SliceHashSet::key_type; | ||
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| MyHashMap hash_map; | ||
| // Use column to store the values in case that the reference of the Slices disappears. | ||
| ColumnPtr value_column; | ||
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| void update(MemPool* mem_pool, const KeyColumnType& arg_key_column, const Column& arg_value_column, size_t offset, | ||
| size_t count) { | ||
| if constexpr (!lt_is_string<KT>) { | ||
| for (int i = offset; i < offset + count; i++) { | ||
| auto key = arg_key_column.get_data()[i]; | ||
| if (!hash_map.contains(key)) { | ||
| auto value = arg_value_column.get(i); | ||
| value_column->append_datum(value); | ||
| hash_map.emplace(key, value_column->size() - 1); | ||
| } | ||
| } | ||
| } else { | ||
| for (int i = offset; i < offset + count; i++) { | ||
| auto raw_key = arg_key_column.get_slice(i); | ||
| KeyType key(raw_key); | ||
| if (!hash_map.contains(key)) { | ||
| uint8_t* pos = mem_pool->allocate(key.size); | ||
| memcpy(pos, key.data, key.size); | ||
| auto value = arg_value_column.get(i); | ||
| value_column->append_datum(value); | ||
| hash_map.emplace(Slice(pos, key.size), value_column->size() - 1); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| }; | ||
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| template <LogicalType KT, typename MyHashMap = std::map<int, size_t>> | ||
| class MapAggAggregateFunction final : public AggregateFunctionBatchHelper<MapAggAggregateFunctionState<KT, MyHashMap>, | ||
| MapAggAggregateFunction<KT, MyHashMap>> { | ||
| public: | ||
| using KeyColumnType = RunTimeColumnType<KT>; | ||
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| void create(FunctionContext* ctx, AggDataPtr __restrict ptr) const override { | ||
| auto* state = new (ptr) MapAggAggregateFunctionState<KT, MyHashMap>; | ||
| state->value_column = ctx->create_column(*ctx->get_arg_type(1), true); | ||
| } | ||
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| void update(FunctionContext* ctx, const Column** columns, AggDataPtr __restrict state, | ||
| size_t row_num) const override { | ||
| // Key could not be null. | ||
| if ((columns[0]->is_nullable() && columns[0]->is_null(row_num)) || columns[0]->only_null()) { | ||
| return; | ||
| } | ||
| const auto& key_column = down_cast<const KeyColumnType&>(*ColumnHelper::get_data_column(columns[0])); | ||
| this->data(state).update(ctx->mem_pool(), key_column, *columns[1], row_num, 1); | ||
| } | ||
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| void merge(FunctionContext* ctx, const Column* column, AggDataPtr __restrict state, size_t row_num) const override { | ||
| auto map_column = down_cast<const MapColumn*>(ColumnHelper::get_data_column(column)); | ||
| auto& offsets = map_column->offsets().get_data(); | ||
| if (offsets[row_num + 1] > offsets[row_num]) { | ||
| this->data(state).update( | ||
| ctx->mem_pool(), | ||
| *down_cast<KeyColumnType*>(ColumnHelper::get_data_column(map_column->keys_column().get())), | ||
| map_column->values(), offsets[row_num], offsets[row_num + 1] - offsets[row_num]); | ||
| } | ||
| } | ||
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| void serialize_to_column(FunctionContext* ctx, ConstAggDataPtr __restrict state, Column* to) const override { | ||
| auto& state_impl = this->data(state); | ||
| auto* map_column = down_cast<MapColumn*>(ColumnHelper::get_data_column(to)); | ||
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| auto elem_size = state_impl.hash_map.size(); | ||
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| auto* key_column = down_cast<KeyColumnType*>(ColumnHelper::get_data_column(map_column->keys_column().get())); | ||
| if constexpr (lt_is_string<KT>) { | ||
| for (const auto& entry : state_impl.hash_map) { | ||
| key_column->append(Slice(entry.first.data, entry.first.size)); | ||
| map_column->values_column()->append_datum(state_impl.value_column->get(entry.second)); | ||
| } | ||
| } else { | ||
| for (const auto& entry : state_impl.hash_map) { | ||
| key_column->append(entry.first); | ||
| map_column->values_column()->append_datum(state_impl.value_column->get(entry.second)); | ||
| } | ||
| } | ||
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| if (to->is_nullable()) { | ||
| down_cast<NullableColumn*>(to)->null_column_data().emplace_back(0); | ||
| } | ||
| if (map_column->keys_column()->is_nullable()) { | ||
| // Key could not be NULL. | ||
| auto* nullable_column = down_cast<NullableColumn*>(map_column->keys_column().get()); | ||
| nullable_column->null_column_data().resize(nullable_column->null_column_data().size() + elem_size); | ||
| } | ||
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| auto& offsets = map_column->offsets_column()->get_data(); | ||
| offsets.push_back(offsets.back() + elem_size); | ||
| } | ||
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| void finalize_to_column(FunctionContext* ctx, ConstAggDataPtr __restrict state, Column* to) const override { | ||
| serialize_to_column(ctx, state, to); | ||
| } | ||
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| void convert_to_serialize_format(FunctionContext* ctx, const Columns& src, size_t chunk_size, | ||
| ColumnPtr* dst) const override { | ||
| auto* column = down_cast<MapColumn*>(ColumnHelper::get_data_column(dst->get())); | ||
| auto key_column = column->keys_column(); | ||
| auto value_column = column->values_column(); | ||
| auto& offsets = column->offsets_column()->get_data(); | ||
| for (size_t i = 0; i < chunk_size; i++) { | ||
| if ((src[0]->is_nullable() && src[0]->is_null(i)) || src[0]->only_null()) { | ||
| offsets.push_back(offsets.back()); | ||
| continue; | ||
| } | ||
| key_column->append(*src[0], i, 1); | ||
| value_column->append(*src[1], i, 1); | ||
| offsets.push_back(offsets.back() + 1); | ||
| } | ||
| } | ||
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| std::string get_name() const override { return "map_agg"; } | ||
| }; | ||
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| } // namespace starrocks |
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