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#include <Columns/ColumnDecimal.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypesDecimal.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include "FunctionArrayMapped.h"
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int ILLEGAL_COLUMN;
extern const int DECIMAL_OVERFLOW;
}
/** arrayDifference() - returns an array with the difference between all pairs of neighboring elements.
*/
struct ArrayDifferenceImpl
{
static bool needBoolean() { return false; }
static bool needExpression() { return false; }
static bool needOneArray() { return false; }
static DataTypePtr getReturnType(const DataTypePtr & expression_return, const DataTypePtr & /*array_element*/)
{
WhichDataType which(expression_return);
if (which.isUInt8() || which.isInt8())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt16>());
if (which.isUInt16() || which.isInt16() || which.isDate())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt32>());
if (which.isUInt32() || which.isUInt64() || which.isInt32() || which.isInt64() || which.isDate32() || which.isDateTime())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt64>());
if (which.isUInt128() || which.isInt128())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt128>());
if (which.isUInt256() || which.isInt256())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeInt256>());
if (which.isFloat32() || which.isFloat64())
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeFloat64>());
if (which.isDecimal())
return std::make_shared<DataTypeArray>(expression_return);
if (which.isDateTime64())
{
UInt32 scale = getDecimalScale(*expression_return);
UInt32 precision = getDecimalPrecision(*expression_return);
return std::make_shared<DataTypeArray>(std::make_shared<DataTypeDecimal<Decimal64>>(precision, scale));
}
throw Exception(
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT, "arrayDifference cannot process values of type {}", expression_return->getName());
}
template <typename Element, typename Result>
static void NO_SANITIZE_UNDEFINED impl(const Element * __restrict src, Result * __restrict dst, size_t begin, size_t end)
{
/// First element is zero, then the differences of ith and i-1th elements.
Element prev{};
for (size_t pos = begin; pos < end; ++pos)
{
if (pos == begin)
{
dst[pos] = {};
prev = src[pos];
}
else
{
Element curr = src[pos];
if constexpr (is_decimal<Element>)
{
using ResultNativeType = typename Result::NativeType;
ResultNativeType result_value;
bool overflow = common::subOverflow(
static_cast<ResultNativeType>(curr.value), static_cast<ResultNativeType>(prev.value), result_value);
if (overflow)
throw Exception(ErrorCodes::DECIMAL_OVERFLOW, "Decimal math overflow");
dst[pos] = Result(result_value);
}
else
{
dst[pos] = static_cast<Result>(curr) - static_cast<Result>(prev);
}
prev = curr;
}
}
}
template <typename Element, typename Result>
static bool executeType(const ColumnPtr & mapped, const ColumnArray & array, ColumnPtr & res_ptr)
{
using ColVecType = ColumnVectorOrDecimal<Element>;
using ColVecResult = ColumnVectorOrDecimal<Result>;
const ColVecType * column = checkAndGetColumn<ColVecType>(&*mapped);
if (!column)
return false;
const IColumn::Offsets & offsets = array.getOffsets();
const typename ColVecType::Container & data = column->getData();
typename ColVecResult::MutablePtr res_nested;
if constexpr (is_decimal<Element>)
res_nested = ColVecResult::create(0, column->getScale());
else
res_nested = ColVecResult::create();
typename ColVecResult::Container & res_values = res_nested->getData();
res_values.resize(data.size());
size_t pos = 0;
for (auto offset : offsets)
{
impl(data.data(), res_values.data(), pos, offset);
pos = offset;
}
res_ptr = ColumnArray::create(std::move(res_nested), array.getOffsetsPtr());
return true;
}
static ColumnPtr execute(const ColumnArray & array, ColumnPtr mapped)
{
ColumnPtr res;
mapped = mapped->convertToFullColumnIfConst();
if (executeType<UInt8, Int16>(mapped, array, res) || executeType<UInt16, Int32>(mapped, array, res)
|| executeType<UInt32, Int64>(mapped, array, res) || executeType<UInt64, Int64>(mapped, array, res)
|| executeType<Int8, Int16>(mapped, array, res) || executeType<Int16, Int32>(mapped, array, res)
|| executeType<Int32, Int64>(mapped, array, res) || executeType<Int64, Int64>(mapped, array, res)
|| executeType<UInt128, Int128>(mapped, array, res) || executeType<Int128, Int128>(mapped, array, res)
|| executeType<UInt256, Int256>(mapped, array, res) || executeType<Int256, Int256>(mapped, array, res)
|| executeType<Float32, Float64>(mapped, array, res) || executeType<Float64, Float64>(mapped, array, res)
|| executeType<Decimal32, Decimal32>(mapped, array, res) || executeType<Decimal64, Decimal64>(mapped, array, res)
|| executeType<Decimal128, Decimal128>(mapped, array, res) || executeType<Decimal256, Decimal256>(mapped, array, res)
|| executeType<DateTime64, Decimal64>(mapped, array, res))
return res;
else
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Unexpected column for arrayDifference: {}", mapped->getName());
}
};
struct NameArrayDifference
{
static constexpr auto name = "arrayDifference";
};
using FunctionArrayDifference = FunctionArrayMapped<ArrayDifferenceImpl, NameArrayDifference>;
REGISTER_FUNCTION(ArrayDifference)
{
factory.registerFunction<FunctionArrayDifference>();
}
}
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