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https://github.com/ClickHouse/ClickHouse.git
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456 lines
14 KiB
C++
456 lines
14 KiB
C++
#pragma once
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#include <DataTypes/DataTypesNumber.h>
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#include <Columns/ColumnsNumber.h>
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#include <Columns/ColumnConst.h>
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#include <IO/WriteHelpers.h>
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#include <Functions/IFunction.h>
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#include <Functions/FunctionsArithmetic.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 NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
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}
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/** Functions are logical links: and, or, not, xor.
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* Accept any numeric types, return a UInt8 containing 0 or 1.
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*/
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template<typename B>
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struct AndImpl
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{
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static inline bool isSaturable()
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{
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return true;
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}
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static inline bool isSaturatedValue(UInt8 a)
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{
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return !a;
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}
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static inline UInt8 apply(UInt8 a, B b)
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{
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return a && b;
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}
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};
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template<typename B>
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struct OrImpl
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{
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static inline bool isSaturable()
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{
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return true;
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}
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static inline bool isSaturatedValue(UInt8 a)
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{
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return a;
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}
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static inline UInt8 apply(UInt8 a, B b)
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{
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return a || b;
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}
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};
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template<typename B>
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struct XorImpl
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{
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static inline bool isSaturable()
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{
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return false;
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}
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static inline bool isSaturatedValue(UInt8 a)
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{
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return false;
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}
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static inline UInt8 apply(UInt8 a, B b)
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{
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return (!a) != (!b);
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}
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};
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template<typename A>
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struct NotImpl
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{
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using ResultType = UInt8;
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static inline UInt8 apply(A a)
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{
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return !a;
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}
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};
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using UInt8Container = ColumnUInt8::Container_t;
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using UInt8ColumnPtrs = std::vector<const ColumnUInt8 *>;
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template <typename Op, size_t N>
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struct AssociativeOperationImpl
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{
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/// Erases the N last columns from `in` (if there are less, then all) and puts into `result` their combination.
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static void execute(UInt8ColumnPtrs & in, UInt8Container & result)
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{
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if (N > in.size())
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{
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AssociativeOperationImpl<Op, N - 1>::execute(in, result);
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return;
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}
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AssociativeOperationImpl<Op, N> operation(in);
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in.erase(in.end() - N, in.end());
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size_t n = result.size();
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for (size_t i = 0; i < n; ++i)
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{
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result[i] = operation.apply(i);
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}
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}
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const UInt8Container & vec;
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AssociativeOperationImpl<Op, N - 1> continuation;
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/// Remembers the last N columns from `in`.
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AssociativeOperationImpl(UInt8ColumnPtrs & in)
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: vec(in[in.size() - N]->getData()), continuation(in) {}
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/// Returns a combination of values in the i-th row of all columns stored in the constructor.
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inline UInt8 apply(size_t i) const
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{
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if (Op::isSaturable())
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{
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UInt8 a = vec[i];
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return Op::isSaturatedValue(a) ? a : continuation.apply(i);
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}
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else
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{
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return Op::apply(vec[i], continuation.apply(i));
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}
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}
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};
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template <typename Op>
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struct AssociativeOperationImpl<Op, 1>
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{
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static void execute(UInt8ColumnPtrs & in, UInt8Container & result)
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{
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throw Exception("Logical error: AssociativeOperationImpl<Op, 1>::execute called", ErrorCodes::LOGICAL_ERROR);
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}
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const UInt8Container & vec;
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AssociativeOperationImpl(UInt8ColumnPtrs & in)
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: vec(in[in.size() - 1]->getData()) {}
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inline UInt8 apply(size_t i) const
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{
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return vec[i];
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}
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};
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template <template <typename> class Impl, typename Name>
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class FunctionAnyArityLogical : public IFunction
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{
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public:
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static constexpr auto name = Name::name;
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static FunctionPtr create(const Context & context) { return std::make_shared<FunctionAnyArityLogical>(); };
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private:
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bool extractConstColumns(ColumnPlainPtrs & in, UInt8 & res)
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{
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bool has_res = false;
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for (int i = static_cast<int>(in.size()) - 1; i >= 0; --i)
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{
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if (in[i]->isConst())
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{
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Field val = (*in[i])[0];
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UInt8 x = !!val.get<UInt64>();
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if (has_res)
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{
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res = Impl<UInt8>::apply(res, x);
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}
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else
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{
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res = x;
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has_res = true;
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}
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in.erase(in.begin() + i);
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}
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}
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return has_res;
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}
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template <typename T>
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bool convertTypeToUInt8(const IColumn * column, UInt8Container & res)
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{
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auto col = typeid_cast<const ColumnVector<T> *>(column);
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if (!col)
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return false;
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const typename ColumnVector<T>::Container_t & vec = col->getData();
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size_t n = res.size();
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for (size_t i = 0; i < n; ++i)
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{
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res[i] = !!vec[i];
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}
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return true;
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}
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void convertToUInt8(const IColumn * column, UInt8Container & res)
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{
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if (!convertTypeToUInt8< Int8 >(column, res) &&
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!convertTypeToUInt8< Int16>(column, res) &&
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!convertTypeToUInt8< Int32>(column, res) &&
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!convertTypeToUInt8< Int64>(column, res) &&
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!convertTypeToUInt8< UInt16>(column, res) &&
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!convertTypeToUInt8< UInt32>(column, res) &&
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!convertTypeToUInt8< UInt64>(column, res) &&
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!convertTypeToUInt8<Float32>(column, res) &&
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!convertTypeToUInt8<Float64>(column, res))
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throw Exception("Unexpected type of column: " + column->getName(), ErrorCodes::ILLEGAL_COLUMN);
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}
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template <typename T>
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bool executeUInt8Type(const UInt8Container & uint8_vec, IColumn * column, UInt8Container & res)
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{
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auto col = typeid_cast<const ColumnVector<T> *>(column);
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if (!col)
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return false;
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const typename ColumnVector<T>::Container_t & other_vec = col->getData();
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size_t n = res.size();
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for (size_t i = 0; i < n; ++i)
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{
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res[i] = Impl<T>::apply(uint8_vec[i], other_vec[i]);
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}
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return true;
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}
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void executeUInt8Other(const UInt8Container & uint8_vec, IColumn * column, UInt8Container & res)
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{
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if (!executeUInt8Type< Int8 >(uint8_vec, column, res) &&
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!executeUInt8Type< Int16>(uint8_vec, column, res) &&
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!executeUInt8Type< Int32>(uint8_vec, column, res) &&
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!executeUInt8Type< Int64>(uint8_vec, column, res) &&
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!executeUInt8Type< UInt16>(uint8_vec, column, res) &&
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!executeUInt8Type< UInt32>(uint8_vec, column, res) &&
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!executeUInt8Type< UInt64>(uint8_vec, column, res) &&
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!executeUInt8Type<Float32>(uint8_vec, column, res) &&
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!executeUInt8Type<Float64>(uint8_vec, column, res))
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throw Exception("Unexpected type of column: " + column->getName(), ErrorCodes::ILLEGAL_COLUMN);
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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 name;
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}
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bool isVariadic() const override { return true; }
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size_t getNumberOfArguments() const override { return 0; }
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/// Get result types by argument types. If the function does not apply to these arguments, throw an exception.
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (arguments.size() < 2)
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throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
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+ toString(arguments.size()) + ", should be at least 2.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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for (size_t i = 0; i < arguments.size(); ++i)
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{
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if (!arguments[i]->isNumeric())
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throw Exception("Illegal type ("
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+ arguments[i]->getName()
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+ ") of " + toString(i + 1) + " argument of function " + getName(),
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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return std::make_shared<DataTypeUInt8>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override
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{
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ColumnPlainPtrs in(arguments.size());
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for (size_t i = 0; i < arguments.size(); ++i)
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{
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in[i] = block.safeGetByPosition(arguments[i]).column.get();
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}
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size_t n = in[0]->size();
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/// Combine all constant columns into a single value.
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UInt8 const_val = 0;
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bool has_consts = extractConstColumns(in, const_val);
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// If this value uniquely determines the result, return it.
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if (has_consts && (in.empty() || Impl<UInt8>::apply(const_val, 0) == Impl<UInt8>::apply(const_val, 1)))
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{
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if (!in.empty())
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const_val = Impl<UInt8>::apply(const_val, 0);
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auto col_res = std::make_shared<ColumnConst<UInt8>>(n, const_val);
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block.safeGetByPosition(result).column = col_res;
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return;
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}
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/// If this value is a neutral element, let's forget about it.
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if (has_consts && Impl<UInt8>::apply(const_val, 0) == 0 && Impl<UInt8>::apply(const_val, 1) == 1)
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has_consts = false;
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auto col_res = std::make_shared<ColumnUInt8>();
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block.safeGetByPosition(result).column = col_res;
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UInt8Container & vec_res = col_res->getData();
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if (has_consts)
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{
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vec_res.assign(n, const_val);
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in.push_back(col_res.get());
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}
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else
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{
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vec_res.resize(n);
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}
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/// Divide the input columns into UInt8 and the rest. The first will be processed more efficiently.
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/// col_res at each moment will either be at the end of uint8_in, or not contained in uint8_in.
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UInt8ColumnPtrs uint8_in;
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ColumnPlainPtrs other_in;
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for (IColumn * column : in)
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{
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if (auto uint8_column = typeid_cast<const ColumnUInt8 *>(column))
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uint8_in.push_back(uint8_column);
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else
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other_in.push_back(column);
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}
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/// You need at least one column in uint8_in, so that you can combine columns from other_in.
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if (uint8_in.empty())
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{
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if (other_in.empty())
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throw Exception("Hello, I'm a bug", ErrorCodes::LOGICAL_ERROR);
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convertToUInt8(other_in.back(), vec_res);
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other_in.pop_back();
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uint8_in.push_back(col_res.get());
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}
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/// Effectively combine all the columns of the correct type.
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while (uint8_in.size() > 1)
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{
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/// With a large block size, combining 6 columns per pass is the fastest.
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/// When small - more, is faster.
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AssociativeOperationImpl<Impl<UInt8>, 10>::execute(uint8_in, vec_res);
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uint8_in.push_back(col_res.get());
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}
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/// Add all the columns of the wrong type one at a time.
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while (!other_in.empty())
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{
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executeUInt8Other(uint8_in[0]->getData(), other_in.back(), vec_res);
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other_in.pop_back();
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uint8_in[0] = col_res.get();
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}
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/// This is possible if there is exactly one non-constant among the arguments, and it is of type UInt8.
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if (uint8_in[0] != col_res.get())
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{
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vec_res.assign(uint8_in[0]->getData());
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}
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}
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};
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template <template <typename> class Impl, typename Name>
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class FunctionUnaryLogical : public IFunction
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{
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public:
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static constexpr auto name = Name::name;
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static FunctionPtr create(const Context & context) { return std::make_shared<FunctionUnaryLogical>(); };
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private:
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template <typename T>
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bool executeType(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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if (ColumnVector<T> * col = typeid_cast<ColumnVector<T> *>(block.safeGetByPosition(arguments[0]).column.get()))
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{
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auto col_res = std::make_shared<ColumnUInt8>();
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block.safeGetByPosition(result).column = col_res;
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typename ColumnUInt8::Container_t & vec_res = col_res->getData();
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vec_res.resize(col->getData().size());
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UnaryOperationImpl<T, Impl<T> >::vector(col->getData(), vec_res);
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return true;
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}
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else if (ColumnConst<T> * col = typeid_cast<ColumnConst<T> *>(block.safeGetByPosition(arguments[0]).column.get()))
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{
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UInt8 res = 0;
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UnaryOperationImpl<T, Impl<T> >::constant(col->getData(), res);
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auto col_res = std::make_shared<ColumnConst<UInt8>>(col->size(), res);
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block.safeGetByPosition(result).column = col_res;
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return true;
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}
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return false;
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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 name;
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}
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size_t getNumberOfArguments() const override { return 1; }
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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (!arguments[0]->isNumeric())
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throw Exception("Illegal type ("
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+ arguments[0]->getName()
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+ ") of argument of function " + getName(),
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeUInt8>();
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}
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override
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{
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if (!( executeType<UInt8>(block, arguments, result)
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|| executeType<UInt16>(block, arguments, result)
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|| executeType<UInt32>(block, arguments, result)
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|| executeType<UInt64>(block, arguments, result)
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|| executeType<Int8>(block, arguments, result)
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|| executeType<Int16>(block, arguments, result)
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|| executeType<Int32>(block, arguments, result)
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|| executeType<Int64>(block, arguments, result)
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|| executeType<Float32>(block, arguments, result)
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|| executeType<Float64>(block, arguments, result)))
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throw Exception("Illegal column " + block.safeGetByPosition(arguments[0]).column->getName()
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+ " of argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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struct NameAnd { static constexpr auto name = "and"; };
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struct NameOr { static constexpr auto name = "or"; };
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struct NameXor { static constexpr auto name = "xor"; };
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struct NameNot { static constexpr auto name = "not"; };
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using FunctionAnd = FunctionAnyArityLogical <AndImpl, NameAnd>;
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using FunctionOr = FunctionAnyArityLogical <OrImpl, NameOr> ;
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using FunctionXor = FunctionAnyArityLogical <XorImpl, NameXor>;
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using FunctionNot = FunctionUnaryLogical <NotImpl, NameNot>;
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}
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