| /** |
| * 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. |
| **/ |
| |
| #include "expressions/aggregation/AggregationHandleAvg.hpp" |
| |
| #include <cstddef> |
| #include <cstdint> |
| #include <memory> |
| #include <vector> |
| |
| #include "catalog/CatalogTypedefs.hpp" |
| #include "expressions/aggregation/AggregationID.hpp" |
| #include "storage/ValueAccessorMultiplexer.hpp" |
| #include "threading/SpinMutex.hpp" |
| #include "types/Type.hpp" |
| #include "types/TypeFactory.hpp" |
| #include "types/TypeID.hpp" |
| #include "types/TypedValue.hpp" |
| #include "types/operations/binary_operations/BinaryOperation.hpp" |
| #include "types/operations/binary_operations/BinaryOperationFactory.hpp" |
| #include "types/operations/binary_operations/BinaryOperationID.hpp" |
| |
| #include "glog/logging.h" |
| |
| namespace quickstep { |
| |
| class ColumnVector; |
| |
| AggregationHandleAvg::AggregationHandleAvg(const Type &type) |
| : AggregationConcreteHandle(AggregationID::kAvg), |
| argument_type_(type) { |
| // We sum Int as Long and Float as Double so that we have more headroom when |
| // adding many values. |
| TypeID type_precision_id; |
| switch (type.getTypeID()) { |
| case kInt: |
| case kLong: |
| type_precision_id = kLong; |
| break; |
| case kFloat: |
| case kDouble: |
| type_precision_id = kDouble; |
| break; |
| default: |
| type_precision_id = type.getTypeID(); |
| break; |
| } |
| |
| const Type &sum_type = TypeFactory::GetType(type_precision_id); |
| blank_state_.sum_ = sum_type.makeZeroValue(); |
| blank_state_.count_ = 0; |
| |
| // Make operators to do arithmetic: |
| // Add operator for summing argument values. |
| fast_add_operator_.reset( |
| BinaryOperationFactory::GetBinaryOperation(BinaryOperationID::kAdd) |
| .makeUncheckedBinaryOperatorForTypes(sum_type, argument_type_)); |
| // Add operator for merging states. |
| merge_add_operator_.reset( |
| BinaryOperationFactory::GetBinaryOperation(BinaryOperationID::kAdd) |
| .makeUncheckedBinaryOperatorForTypes(sum_type, sum_type)); |
| // Divide operator for dividing sum by count to get final average. |
| divide_operator_.reset( |
| BinaryOperationFactory::GetBinaryOperation(BinaryOperationID::kDivide) |
| .makeUncheckedBinaryOperatorForTypes(sum_type, |
| TypeFactory::GetType(kDouble))); |
| |
| // Result is nullable, because AVG() over 0 values (or all NULL values) is |
| // NULL. |
| result_type_ = |
| &(BinaryOperationFactory::GetBinaryOperation(BinaryOperationID::kDivide) |
| .resultTypeForArgumentTypes(sum_type, TypeFactory::GetType(kDouble)) |
| ->getNullableVersion()); |
| } |
| |
| AggregationState* AggregationHandleAvg::accumulateValueAccessor( |
| const std::vector<MultiSourceAttributeId> &argument_ids, |
| const ValueAccessorMultiplexer &accessor_mux) const { |
| DCHECK_EQ(1u, argument_ids.size()) |
| << "Got wrong number of attributes for AVG: " << argument_ids.size(); |
| |
| const ValueAccessorSource argument_source = argument_ids.front().source; |
| const attribute_id argument_id = argument_ids.front().attr_id; |
| |
| DCHECK(argument_source != ValueAccessorSource::kInvalid); |
| DCHECK_NE(argument_id, kInvalidAttributeID); |
| |
| AggregationStateAvg *state = new AggregationStateAvg(blank_state_); |
| std::size_t count = 0; |
| state->sum_ = |
| fast_add_operator_->accumulateValueAccessor( |
| state->sum_, |
| accessor_mux.getValueAccessorBySource(argument_source), |
| argument_id, |
| &count); |
| state->count_ = count; |
| return state; |
| } |
| |
| void AggregationHandleAvg::mergeStates(const AggregationState &source, |
| AggregationState *destination) const { |
| const AggregationStateAvg &avg_source = |
| static_cast<const AggregationStateAvg &>(source); |
| AggregationStateAvg *avg_destination = |
| static_cast<AggregationStateAvg *>(destination); |
| |
| SpinMutexLock lock(avg_destination->mutex_); |
| avg_destination->count_ += avg_source.count_; |
| avg_destination->sum_ = merge_add_operator_->applyToTypedValues( |
| avg_destination->sum_, avg_source.sum_); |
| } |
| |
| void AggregationHandleAvg::mergeStates(const std::uint8_t *source, |
| std::uint8_t *destination) const { |
| const TypedValue *src_sum_ptr = |
| reinterpret_cast<const TypedValue *>(source + blank_state_.sum_offset_); |
| const std::int64_t *src_count_ptr = reinterpret_cast<const std::int64_t *>( |
| source + blank_state_.count_offset_); |
| TypedValue *dst_sum_ptr = |
| reinterpret_cast<TypedValue *>(destination + blank_state_.sum_offset_); |
| std::int64_t *dst_count_ptr = reinterpret_cast<std::int64_t *>( |
| destination + blank_state_.count_offset_); |
| (*dst_count_ptr) += (*src_count_ptr); |
| *dst_sum_ptr = |
| merge_add_operator_->applyToTypedValues(*dst_sum_ptr, *src_sum_ptr); |
| } |
| |
| TypedValue AggregationHandleAvg::finalize(const AggregationState &state) const { |
| const AggregationStateAvg &agg_state = |
| static_cast<const AggregationStateAvg &>(state); |
| if (agg_state.count_ == 0) { |
| // AVG() over no values is NULL. |
| return result_type_->makeNullValue(); |
| } else { |
| // Divide sum by count to get final average. |
| return divide_operator_->applyToTypedValues( |
| agg_state.sum_, TypedValue(static_cast<double>(agg_state.count_))); |
| } |
| } |
| |
| ColumnVector* AggregationHandleAvg::finalizeHashTable( |
| const AggregationStateHashTableBase &hash_table, |
| const std::size_t index, |
| std::vector<std::vector<TypedValue>> *group_by_keys) const { |
| return finalizeHashTableHelper<AggregationHandleAvg>( |
| *result_type_, hash_table, index, group_by_keys); |
| } |
| |
| AggregationState* AggregationHandleAvg::aggregateOnDistinctifyHashTableForSingle( |
| const AggregationStateHashTableBase &distinctify_hash_table) const { |
| return aggregateOnDistinctifyHashTableForSingleUnaryHelper< |
| AggregationHandleAvg, AggregationStateAvg>( |
| distinctify_hash_table); |
| } |
| |
| void AggregationHandleAvg::aggregateOnDistinctifyHashTableForGroupBy( |
| const AggregationStateHashTableBase &distinctify_hash_table, |
| const std::size_t index, |
| AggregationStateHashTableBase *aggregation_hash_table) const { |
| aggregateOnDistinctifyHashTableForGroupByUnaryHelper<AggregationHandleAvg>( |
| distinctify_hash_table, index, aggregation_hash_table); |
| } |
| |
| } // namespace quickstep |