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416 lines
17 KiB
C++
416 lines
17 KiB
C++
#include <AggregateFunctions/AggregateFunctionCombinatorFactory.h>
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#include <AggregateFunctions/AggregateFunctionIf.h>
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#include "AggregateFunctionNull.h"
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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extern const int ILLEGAL_AGGREGATION;
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}
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class AggregateFunctionCombinatorIf final : public IAggregateFunctionCombinator
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{
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public:
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String getName() const override { return "If"; }
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DataTypes transformArguments(const DataTypes & arguments) const override
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{
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if (arguments.empty())
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throw Exception("Incorrect number of arguments for aggregate function with " + getName() + " suffix",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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if (!isUInt8(arguments.back()))
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throw Exception("Illegal type " + arguments.back()->getName() + " of last argument for aggregate function with " + getName() + " suffix",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return DataTypes(arguments.begin(), std::prev(arguments.end()));
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}
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AggregateFunctionPtr transformAggregateFunction(
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const AggregateFunctionPtr & nested_function,
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const AggregateFunctionProperties &,
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const DataTypes & arguments,
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const Array & params) const override
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{
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if (nested_function->getName().find(getName()) != String::npos)
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{
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throw Exception(ErrorCodes::ILLEGAL_AGGREGATION, "nested function for {0}-combinator must not have {0}-combinator", getName());
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}
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return std::make_shared<AggregateFunctionIf>(nested_function, arguments, params);
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}
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};
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/** Given an array of flags, checks if it's all zeros
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* When the buffer is all zeros, this is slightly faster than doing a memcmp since doesn't require allocating memory
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* When the buffer has values, this is much faster since it avoids visiting all memory (and the allocation and function calls)
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*/
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static bool ALWAYS_INLINE inline is_all_zeros(const UInt8 * flags, size_t size)
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{
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size_t unroll_size = size - size % 8;
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size_t i = 0;
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while (i < unroll_size)
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{
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UInt64 v = *reinterpret_cast<const UInt64 *>(&flags[i]);
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if (v)
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return false;
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i += 8;
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}
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for (; i < size; i++)
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if (flags[i])
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return false;
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return true;
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}
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/** There are two cases: for single argument and variadic.
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* Code for single argument is much more efficient.
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*/
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template <bool result_is_nullable, bool serialize_flag>
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class AggregateFunctionIfNullUnary final
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: public AggregateFunctionNullBase<result_is_nullable, serialize_flag,
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AggregateFunctionIfNullUnary<result_is_nullable, serialize_flag>>
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{
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private:
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size_t num_arguments;
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/// The name of the nested function, including combinators (i.e. *If)
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///
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/// getName() from the nested_function cannot be used because in case of *If combinator
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/// with Nullable argument nested_function will point to the function w/o combinator.
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/// (I.e. sumIf(Nullable, 1) -> sum()), and distributed query processing will fail.
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///
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/// And nested_function cannot point to the function with *If since
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/// due to optimization in the add() which pass only one column with the result,
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/// and so AggregateFunctionIf::add() cannot be called this way
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/// (it write to the last argument -- num_arguments-1).
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///
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/// And to avoid extra level of indirection, the name of function is cached:
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///
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/// AggregateFunctionIfNullUnary::add -> [ AggregateFunctionIf::add -> ] AggregateFunctionSum::add
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String name;
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using Base = AggregateFunctionNullBase<result_is_nullable, serialize_flag,
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AggregateFunctionIfNullUnary<result_is_nullable, serialize_flag>>;
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public:
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String getName() const override
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{
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return name;
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}
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AggregateFunctionIfNullUnary(const String & name_, AggregateFunctionPtr nested_function_, const DataTypes & arguments, const Array & params)
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: Base(std::move(nested_function_), arguments, params)
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, num_arguments(arguments.size())
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, name(name_)
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{
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if (num_arguments == 0)
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throw Exception("Aggregate function " + getName() + " require at least one argument",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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}
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static inline bool singleFilter(const IColumn ** columns, size_t row_num, size_t num_arguments)
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{
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const IColumn * filter_column = columns[num_arguments - 1];
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if (const ColumnNullable * nullable_column = typeid_cast<const ColumnNullable *>(filter_column))
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filter_column = nullable_column->getNestedColumnPtr().get();
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return assert_cast<const ColumnUInt8 &>(*filter_column).getData()[row_num];
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}
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void add(AggregateDataPtr __restrict place, const IColumn ** columns, size_t row_num, Arena * arena) const override
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{
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const ColumnNullable * column = assert_cast<const ColumnNullable *>(columns[0]);
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const IColumn * nested_column = &column->getNestedColumn();
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if (!column->isNullAt(row_num) && singleFilter(columns, row_num, num_arguments))
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{
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this->setFlag(place);
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this->nested_function->add(this->nestedPlace(place), &nested_column, row_num, arena);
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}
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}
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void addBatchSinglePlace(size_t batch_size, AggregateDataPtr place, const IColumn ** columns, Arena * arena, ssize_t) const override
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{
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const ColumnNullable * column = assert_cast<const ColumnNullable *>(columns[0]);
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const UInt8 * null_map = column->getNullMapData().data();
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const IColumn * columns_param[] = {&column->getNestedColumn()};
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const IColumn * filter_column = columns[num_arguments - 1];
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if (const ColumnNullable * nullable_column = typeid_cast<const ColumnNullable *>(filter_column))
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filter_column = nullable_column->getNestedColumnPtr().get();
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if constexpr (result_is_nullable)
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{
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/// We need to check if there is work to do as otherwise setting the flag would be a mistake,
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/// it would mean that the return value would be the default value of the nested type instead of NULL
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if (is_all_zeros(assert_cast<const ColumnUInt8 *>(filter_column)->getData().data(), batch_size))
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return;
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}
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/// Combine the 2 flag arrays so we can call a simplified version (one check vs 2)
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/// Note that now the null map will contain 0 if not null and not filtered, or 1 for null or filtered (or both)
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const auto * filter_flags = assert_cast<const ColumnUInt8 *>(filter_column)->getData().data();
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auto final_nulls = std::make_unique<UInt8[]>(batch_size);
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for (size_t i = 0; i < batch_size; ++i)
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final_nulls[i] = (!!null_map[i]) | (!filter_flags[i]);
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this->nested_function->addBatchSinglePlaceNotNull(
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batch_size, this->nestedPlace(place), columns_param, final_nulls.get(), arena, -1);
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if constexpr (result_is_nullable)
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if (!memoryIsByte(null_map, batch_size, 1))
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this->setFlag(place);
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}
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#if USE_EMBEDDED_COMPILER
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void compileAdd(llvm::IRBuilderBase & builder, llvm::Value * aggregate_data_ptr, const DataTypes & arguments_types, const std::vector<llvm::Value *> & argument_values) const override
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{
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llvm::IRBuilder<> & b = static_cast<llvm::IRBuilder<> &>(builder);
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const auto & nullable_type = arguments_types[0];
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const auto & nullable_value = argument_values[0];
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auto * wrapped_value = b.CreateExtractValue(nullable_value, {0});
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auto * is_null_value = b.CreateExtractValue(nullable_value, {1});
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const auto & predicate_type = arguments_types[argument_values.size() - 1];
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auto * predicate_value = argument_values[argument_values.size() - 1];
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auto * is_predicate_true = nativeBoolCast(b, predicate_type, predicate_value);
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auto * head = b.GetInsertBlock();
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auto * join_block = llvm::BasicBlock::Create(head->getContext(), "join_block", head->getParent());
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auto * if_null = llvm::BasicBlock::Create(head->getContext(), "if_null", head->getParent());
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auto * if_not_null = llvm::BasicBlock::Create(head->getContext(), "if_not_null", head->getParent());
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b.CreateCondBr(b.CreateAnd(b.CreateNot(is_null_value), is_predicate_true), if_not_null, if_null);
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b.SetInsertPoint(if_null);
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b.CreateBr(join_block);
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b.SetInsertPoint(if_not_null);
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if constexpr (result_is_nullable)
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b.CreateStore(llvm::ConstantInt::get(b.getInt8Ty(), 1), aggregate_data_ptr);
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auto * aggregate_data_ptr_with_prefix_size_offset = b.CreateConstInBoundsGEP1_64(nullptr, aggregate_data_ptr, this->prefix_size);
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this->nested_function->compileAdd(b, aggregate_data_ptr_with_prefix_size_offset, { removeNullable(nullable_type) }, { wrapped_value });
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b.CreateBr(join_block);
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b.SetInsertPoint(join_block);
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}
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#endif
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};
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template <bool result_is_nullable, bool serialize_flag, bool null_is_skipped>
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class AggregateFunctionIfNullVariadic final
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: public AggregateFunctionNullBase<result_is_nullable, serialize_flag,
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AggregateFunctionIfNullVariadic<result_is_nullable, serialize_flag, null_is_skipped>>
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{
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public:
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String getName() const override
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{
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return Base::getName();
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}
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AggregateFunctionIfNullVariadic(AggregateFunctionPtr nested_function_, const DataTypes & arguments, const Array & params)
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: Base(std::move(nested_function_), arguments, params), number_of_arguments(arguments.size())
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{
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if (number_of_arguments == 1)
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throw Exception("Logical error: single argument is passed to AggregateFunctionIfNullVariadic", ErrorCodes::LOGICAL_ERROR);
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if (number_of_arguments > MAX_ARGS)
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throw Exception("Maximum number of arguments for aggregate function with Nullable types is " + toString(size_t(MAX_ARGS)),
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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for (size_t i = 0; i < number_of_arguments; ++i)
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is_nullable[i] = arguments[i]->isNullable();
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}
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static inline bool singleFilter(const IColumn ** columns, size_t row_num, size_t num_arguments)
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{
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return assert_cast<const ColumnUInt8 &>(*columns[num_arguments - 1]).getData()[row_num];
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}
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void add(AggregateDataPtr __restrict place, const IColumn ** columns, size_t row_num, Arena * arena) const override
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{
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/// This container stores the columns we really pass to the nested function.
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const IColumn * nested_columns[number_of_arguments];
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for (size_t i = 0; i < number_of_arguments; ++i)
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{
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if (is_nullable[i])
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{
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const ColumnNullable & nullable_col = assert_cast<const ColumnNullable &>(*columns[i]);
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if (null_is_skipped && nullable_col.isNullAt(row_num))
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{
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/// If at least one column has a null value in the current row,
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/// we don't process this row.
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return;
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}
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nested_columns[i] = &nullable_col.getNestedColumn();
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}
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else
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nested_columns[i] = columns[i];
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}
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if (singleFilter(nested_columns, row_num, number_of_arguments))
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{
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this->setFlag(place);
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this->nested_function->add(this->nestedPlace(place), nested_columns, row_num, arena);
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}
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}
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#if USE_EMBEDDED_COMPILER
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void compileAdd(llvm::IRBuilderBase & builder, llvm::Value * aggregate_data_ptr, const DataTypes & arguments_types, const std::vector<llvm::Value *> & argument_values) const override
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{
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/// TODO: Check
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llvm::IRBuilder<> & b = static_cast<llvm::IRBuilder<> &>(builder);
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size_t arguments_size = arguments_types.size();
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DataTypes non_nullable_types;
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std::vector<llvm::Value * > wrapped_values;
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std::vector<llvm::Value * > is_null_values;
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non_nullable_types.resize(arguments_size);
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wrapped_values.resize(arguments_size);
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is_null_values.resize(arguments_size);
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for (size_t i = 0; i < arguments_size; ++i)
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{
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const auto & argument_value = argument_values[i];
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if (is_nullable[i])
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{
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auto * wrapped_value = b.CreateExtractValue(argument_value, {0});
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if constexpr (null_is_skipped)
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is_null_values[i] = b.CreateExtractValue(argument_value, {1});
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wrapped_values[i] = wrapped_value;
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non_nullable_types[i] = removeNullable(arguments_types[i]);
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}
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else
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{
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wrapped_values[i] = argument_value;
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non_nullable_types[i] = arguments_types[i];
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}
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}
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auto * head = b.GetInsertBlock();
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auto * join_block = llvm::BasicBlock::Create(head->getContext(), "join_block", head->getParent());
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auto * join_block_after_null_checks = llvm::BasicBlock::Create(head->getContext(), "join_block_after_null_checks", head->getParent());
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if constexpr (null_is_skipped)
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{
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auto * values_have_null_ptr = b.CreateAlloca(b.getInt1Ty());
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b.CreateStore(b.getInt1(false), values_have_null_ptr);
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for (auto * is_null_value : is_null_values)
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{
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if (!is_null_value)
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continue;
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auto * values_have_null = b.CreateLoad(b.getInt1Ty(), values_have_null_ptr);
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b.CreateStore(b.CreateOr(values_have_null, is_null_value), values_have_null_ptr);
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}
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b.CreateCondBr(b.CreateLoad(b.getInt1Ty(), values_have_null_ptr), join_block, join_block_after_null_checks);
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}
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b.SetInsertPoint(join_block_after_null_checks);
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const auto & predicate_type = arguments_types[argument_values.size() - 1];
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auto * predicate_value = argument_values[argument_values.size() - 1];
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auto * is_predicate_true = nativeBoolCast(b, predicate_type, predicate_value);
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auto * if_true = llvm::BasicBlock::Create(head->getContext(), "if_true", head->getParent());
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auto * if_false = llvm::BasicBlock::Create(head->getContext(), "if_false", head->getParent());
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b.CreateCondBr(is_predicate_true, if_true, if_false);
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b.SetInsertPoint(if_false);
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b.CreateBr(join_block);
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b.SetInsertPoint(if_true);
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if constexpr (result_is_nullable)
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b.CreateStore(llvm::ConstantInt::get(b.getInt8Ty(), 1), aggregate_data_ptr);
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auto * aggregate_data_ptr_with_prefix_size_offset = b.CreateConstInBoundsGEP1_64(nullptr, aggregate_data_ptr, this->prefix_size);
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this->nested_function->compileAdd(b, aggregate_data_ptr_with_prefix_size_offset, non_nullable_types, wrapped_values);
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b.CreateBr(join_block);
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b.SetInsertPoint(join_block);
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}
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#endif
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private:
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using Base = AggregateFunctionNullBase<result_is_nullable, serialize_flag,
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AggregateFunctionIfNullVariadic<result_is_nullable, serialize_flag, null_is_skipped>>;
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enum { MAX_ARGS = 8 };
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size_t number_of_arguments = 0;
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std::array<char, MAX_ARGS> is_nullable; /// Plain array is better than std::vector due to one indirection less.
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};
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AggregateFunctionPtr AggregateFunctionIf::getOwnNullAdapter(
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const AggregateFunctionPtr & nested_function, const DataTypes & arguments,
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const Array & params, const AggregateFunctionProperties & properties) const
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{
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bool return_type_is_nullable = !properties.returns_default_when_only_null && getReturnType()->canBeInsideNullable();
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size_t nullable_size = std::count_if(arguments.begin(), arguments.end(), [](const auto & element) { return element->isNullable(); });
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return_type_is_nullable &= nullable_size != 1 || !arguments.back()->isNullable(); /// If only condition is nullable. we should non-nullable type.
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bool serialize_flag = return_type_is_nullable || properties.returns_default_when_only_null;
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if (arguments.size() <= 2 && arguments.front()->isNullable())
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{
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if (return_type_is_nullable)
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{
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return std::make_shared<AggregateFunctionIfNullUnary<true, true>>(nested_function->getName(), nested_func, arguments, params);
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}
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else
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{
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if (serialize_flag)
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return std::make_shared<AggregateFunctionIfNullUnary<false, true>>(nested_function->getName(), nested_func, arguments, params);
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else
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return std::make_shared<AggregateFunctionIfNullUnary<false, false>>(nested_function->getName(), nested_func, arguments, params);
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}
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}
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else
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{
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if (return_type_is_nullable)
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{
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return std::make_shared<AggregateFunctionIfNullVariadic<true, true, true>>(nested_function, arguments, params);
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}
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else
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{
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if (serialize_flag)
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return std::make_shared<AggregateFunctionIfNullVariadic<false, true, true>>(nested_function, arguments, params);
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else
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return std::make_shared<AggregateFunctionIfNullVariadic<false, false, true>>(nested_function, arguments, params);
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}
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}
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}
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void registerAggregateFunctionCombinatorIf(AggregateFunctionCombinatorFactory & factory)
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{
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factory.registerCombinator(std::make_shared<AggregateFunctionCombinatorIf>());
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}
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}
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