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313 lines
11 KiB
C++
313 lines
11 KiB
C++
#pragma once
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#include <common/arithmeticOverflow.h>
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#include <Core/Block.h>
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#include <Core/AccurateComparison.h>
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#include <Core/callOnTypeIndex.h>
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#include <DataTypes/DataTypesDecimal.h>
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#include <Columns/ColumnVector.h>
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#include <Columns/ColumnsNumber.h>
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#include <Columns/ColumnConst.h>
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#include <Functions/FunctionHelpers.h> /// TODO Core should not depend on Functions
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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 DECIMAL_OVERFLOW;
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}
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///
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inline bool allowDecimalComparison(const DataTypePtr & left_type, const DataTypePtr & right_type)
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{
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if (isDecimal(left_type))
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{
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if (isDecimal(right_type) || isNotDecimalButComparableToDecimal(right_type))
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return true;
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}
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else if (isNotDecimalButComparableToDecimal(left_type) && isDecimal(right_type))
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return true;
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return false;
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}
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template <size_t > struct ConstructDecInt { using Type = Int32; };
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template <> struct ConstructDecInt<8> { using Type = Int64; };
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template <> struct ConstructDecInt<16> { using Type = Int128; };
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template <typename T, typename U>
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struct DecCompareInt
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{
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using Type = typename ConstructDecInt<(!IsDecimalNumber<U> || sizeof(T) > sizeof(U)) ? sizeof(T) : sizeof(U)>::Type;
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using TypeA = Type;
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using TypeB = Type;
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};
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///
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template <typename A, typename B, template <typename, typename> typename Operation, bool _check_overflow = true,
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bool _actual = IsDecimalNumber<A> || IsDecimalNumber<B>>
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class DecimalComparison
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{
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public:
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using CompareInt = typename DecCompareInt<A, B>::Type;
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using Op = Operation<CompareInt, CompareInt>;
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using ColVecA = std::conditional_t<IsDecimalNumber<A>, ColumnDecimal<A>, ColumnVector<A>>;
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using ColVecB = std::conditional_t<IsDecimalNumber<B>, ColumnDecimal<B>, ColumnVector<B>>;
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using ArrayA = typename ColVecA::Container;
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using ArrayB = typename ColVecB::Container;
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DecimalComparison(Block & block, size_t result, const ColumnWithTypeAndName & col_left, const ColumnWithTypeAndName & col_right)
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{
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if (!apply(block, result, col_left, col_right))
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throw Exception("Wrong decimal comparison with " + col_left.type->getName() + " and " + col_right.type->getName(),
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ErrorCodes::LOGICAL_ERROR);
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}
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static bool apply(Block & block, size_t result [[maybe_unused]],
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const ColumnWithTypeAndName & col_left, const ColumnWithTypeAndName & col_right)
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{
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if constexpr (_actual)
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{
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ColumnPtr c_res;
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Shift shift = getScales<A, B>(col_left.type, col_right.type);
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c_res = applyWithScale(col_left.column, col_right.column, shift);
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if (c_res)
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block.getByPosition(result).column = std::move(c_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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static bool compare(A a, B b, UInt32 scale_a, UInt32 scale_b)
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{
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static const UInt32 max_scale = maxDecimalPrecision<Decimal128>();
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if (scale_a > max_scale || scale_b > max_scale)
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throw Exception("Bad scale of decimal field", ErrorCodes::DECIMAL_OVERFLOW);
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Shift shift;
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if (scale_a < scale_b)
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shift.a = DataTypeDecimal<B>(maxDecimalPrecision<B>(), scale_b).getScaleMultiplier(scale_b - scale_a);
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if (scale_a > scale_b)
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shift.b = DataTypeDecimal<A>(maxDecimalPrecision<A>(), scale_a).getScaleMultiplier(scale_a - scale_b);
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return applyWithScale(a, b, shift);
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}
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private:
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struct Shift
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{
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CompareInt a = 1;
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CompareInt b = 1;
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bool none() const { return a == 1 && b == 1; }
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bool left() const { return a != 1; }
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bool right() const { return b != 1; }
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};
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template <typename T, typename U>
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static auto applyWithScale(T a, U b, const Shift & shift)
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{
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if (shift.left())
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return apply<true, false>(a, b, shift.a);
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else if (shift.right())
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return apply<false, true>(a, b, shift.b);
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return apply<false, false>(a, b, 1);
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}
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template <typename T, typename U>
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static std::enable_if_t<IsDecimalNumber<T> && IsDecimalNumber<U>, Shift>
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getScales(const DataTypePtr & left_type, const DataTypePtr & right_type)
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{
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const DataTypeDecimal<T> * decimal0 = checkDecimal<T>(*left_type);
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const DataTypeDecimal<U> * decimal1 = checkDecimal<U>(*right_type);
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Shift shift;
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if (decimal0 && decimal1)
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{
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auto result_type = decimalResultType(*decimal0, *decimal1, false, false);
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shift.a = result_type.scaleFactorFor(*decimal0, false);
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shift.b = result_type.scaleFactorFor(*decimal1, false);
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}
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else if (decimal0)
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shift.b = decimal0->getScaleMultiplier();
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else if (decimal1)
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shift.a = decimal1->getScaleMultiplier();
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return shift;
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}
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template <typename T, typename U>
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static std::enable_if_t<IsDecimalNumber<T> && !IsDecimalNumber<U>, Shift>
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getScales(const DataTypePtr & left_type, const DataTypePtr &)
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{
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Shift shift;
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const DataTypeDecimal<T> * decimal0 = checkDecimal<T>(*left_type);
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if (decimal0)
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shift.b = decimal0->getScaleMultiplier();
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return shift;
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}
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template <typename T, typename U>
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static std::enable_if_t<!IsDecimalNumber<T> && IsDecimalNumber<U>, Shift>
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getScales(const DataTypePtr &, const DataTypePtr & right_type)
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{
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Shift shift;
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const DataTypeDecimal<U> * decimal1 = checkDecimal<U>(*right_type);
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if (decimal1)
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shift.a = decimal1->getScaleMultiplier();
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return shift;
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}
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template <bool scale_left, bool scale_right>
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static ColumnPtr apply(const ColumnPtr & c0, const ColumnPtr & c1, CompareInt scale)
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{
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auto c_res = ColumnUInt8::create();
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if constexpr (_actual)
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{
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bool c0_is_const = isColumnConst(*c0);
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bool c1_is_const = isColumnConst(*c1);
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if (c0_is_const && c1_is_const)
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{
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const ColumnConst * c0_const = checkAndGetColumnConst<ColVecA>(c0.get());
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const ColumnConst * c1_const = checkAndGetColumnConst<ColVecB>(c1.get());
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A a = c0_const->template getValue<A>();
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B b = c1_const->template getValue<B>();
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UInt8 res = apply<scale_left, scale_right>(a, b, scale);
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return DataTypeUInt8().createColumnConst(c0->size(), toField(res));
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}
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ColumnUInt8::Container & vec_res = c_res->getData();
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vec_res.resize(c0->size());
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if (c0_is_const)
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{
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const ColumnConst * c0_const = checkAndGetColumnConst<ColVecA>(c0.get());
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A a = c0_const->template getValue<A>();
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if (const ColVecB * c1_vec = checkAndGetColumn<ColVecB>(c1.get()))
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constant_vector<scale_left, scale_right>(a, c1_vec->getData(), vec_res, scale);
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else
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throw Exception("Wrong column in Decimal comparison", ErrorCodes::LOGICAL_ERROR);
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}
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else if (c1_is_const)
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{
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const ColumnConst * c1_const = checkAndGetColumnConst<ColVecB>(c1.get());
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B b = c1_const->template getValue<B>();
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if (const ColVecA * c0_vec = checkAndGetColumn<ColVecA>(c0.get()))
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vector_constant<scale_left, scale_right>(c0_vec->getData(), b, vec_res, scale);
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else
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throw Exception("Wrong column in Decimal comparison", ErrorCodes::LOGICAL_ERROR);
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}
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else
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{
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if (const ColVecA * c0_vec = checkAndGetColumn<ColVecA>(c0.get()))
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{
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if (const ColVecB * c1_vec = checkAndGetColumn<ColVecB>(c1.get()))
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vector_vector<scale_left, scale_right>(c0_vec->getData(), c1_vec->getData(), vec_res, scale);
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else
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throw Exception("Wrong column in Decimal comparison", ErrorCodes::LOGICAL_ERROR);
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}
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else
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throw Exception("Wrong column in Decimal comparison", ErrorCodes::LOGICAL_ERROR);
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}
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}
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return c_res;
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}
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template <bool scale_left, bool scale_right>
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static NO_INLINE UInt8 apply(A a, B b, CompareInt scale [[maybe_unused]])
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{
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CompareInt x = a;
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CompareInt y = b;
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if constexpr (_check_overflow)
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{
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bool overflow = false;
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if constexpr (sizeof(A) > sizeof(CompareInt))
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overflow |= (A(x) != a);
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if constexpr (sizeof(B) > sizeof(CompareInt))
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overflow |= (B(y) != b);
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if constexpr (is_unsigned_v<A>)
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overflow |= (x < 0);
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if constexpr (is_unsigned_v<B>)
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overflow |= (y < 0);
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if constexpr (scale_left)
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overflow |= common::mulOverflow(x, scale, x);
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if constexpr (scale_right)
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overflow |= common::mulOverflow(y, scale, y);
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if (overflow)
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throw Exception("Can't compare", ErrorCodes::DECIMAL_OVERFLOW);
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}
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else
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{
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if constexpr (scale_left)
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x *= scale;
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if constexpr (scale_right)
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y *= scale;
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}
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return Op::apply(x, y);
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}
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template <bool scale_left, bool scale_right>
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static void NO_INLINE vector_vector(const ArrayA & a, const ArrayB & b, PaddedPODArray<UInt8> & c,
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CompareInt scale)
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{
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size_t size = a.size();
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const A * a_pos = a.data();
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const B * b_pos = b.data();
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UInt8 * c_pos = c.data();
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const A * a_end = a_pos + size;
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while (a_pos < a_end)
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{
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*c_pos = apply<scale_left, scale_right>(*a_pos, *b_pos, scale);
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++a_pos;
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++b_pos;
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++c_pos;
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}
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}
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template <bool scale_left, bool scale_right>
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static void NO_INLINE vector_constant(const ArrayA & a, B b, PaddedPODArray<UInt8> & c, CompareInt scale)
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{
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size_t size = a.size();
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const A * a_pos = a.data();
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UInt8 * c_pos = c.data();
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const A * a_end = a_pos + size;
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while (a_pos < a_end)
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{
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*c_pos = apply<scale_left, scale_right>(*a_pos, b, scale);
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++a_pos;
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++c_pos;
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}
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}
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template <bool scale_left, bool scale_right>
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static void NO_INLINE constant_vector(A a, const ArrayB & b, PaddedPODArray<UInt8> & c, CompareInt scale)
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{
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size_t size = b.size();
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const B * b_pos = b.data();
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UInt8 * c_pos = c.data();
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const B * b_end = b_pos + size;
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while (b_pos < b_end)
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{
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*c_pos = apply<scale_left, scale_right>(a, *b_pos, scale);
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++b_pos;
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++c_pos;
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}
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}
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};
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}
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