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138 lines
4.3 KiB
C++
138 lines
4.3 KiB
C++
#pragma once
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#include <regex>
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#include <Columns/ColumnVector.h>
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#include <Columns/ColumnsNumber.h>
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#include <Core/Types.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/extractTimeZoneFromFunctionArguments.h>
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#include <Common/Exception.h>
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#include <common/DateLUTImpl.h>
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/// The default mode value to use for the WEEK() function
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#define DEFAULT_WEEK_MODE 0
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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 ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int ILLEGAL_COLUMN;
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}
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/**
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* CustomWeek Transformations.
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*/
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static inline UInt32 dateIsNotSupported(const char * name)
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{
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throw Exception("Illegal type Date of argument for function " + std::string(name), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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}
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/// This factor transformation will say that the function is monotone everywhere.
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struct ZeroTransform
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{
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static inline UInt16 execute(UInt32, UInt8, const DateLUTImpl &) { return 0; }
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static inline UInt16 execute(UInt16, UInt8, const DateLUTImpl &) { return 0; }
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};
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struct ToWeekImpl
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{
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static constexpr auto name = "toWeek";
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static inline UInt8 execute(UInt32 t, UInt8 week_mode, const DateLUTImpl & time_zone)
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{
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YearWeek yw = time_zone.toYearWeek(time_zone.toDayNum(t), week_mode);
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return yw.second;
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}
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static inline UInt8 execute(UInt16 d, UInt8 week_mode, const DateLUTImpl & time_zone)
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{
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YearWeek yw = time_zone.toYearWeek(DayNum(d), week_mode);
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return yw.second;
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}
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using FactorTransform = ZeroTransform;
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};
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struct ToYearWeekImpl
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{
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static constexpr auto name = "toYearWeek";
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static inline UInt32 execute(UInt32 t, UInt8 week_mode, const DateLUTImpl & time_zone)
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{
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YearWeek yw = time_zone.toYearWeek(time_zone.toDayNum(t), week_mode | static_cast<UInt32>(WeekModeFlag::YEAR));
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return yw.first * 100 + yw.second;
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}
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static inline UInt32 execute(UInt16 d, UInt8 week_mode, const DateLUTImpl & time_zone)
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{
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YearWeek yw = time_zone.toYearWeek(DayNum(d), week_mode | static_cast<UInt32>(WeekModeFlag::YEAR));
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return yw.first * 100 + yw.second;
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}
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using FactorTransform = ZeroTransform;
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};
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struct ToStartOfWeekImpl
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{
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static constexpr auto name = "toStartOfWeek";
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static inline UInt16 execute(UInt32 t, UInt8 week_mode, const DateLUTImpl & time_zone)
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{
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return time_zone.toFirstDayNumOfWeek(time_zone.toDayNum(t), week_mode);
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}
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static inline UInt16 execute(UInt16 d, UInt8 week_mode, const DateLUTImpl & time_zone)
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{
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return time_zone.toFirstDayNumOfWeek(DayNum(d), week_mode);
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}
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using FactorTransform = ZeroTransform;
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};
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template <typename FromType, typename ToType, typename Transform>
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struct Transformer
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{
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static void
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vector(const PaddedPODArray<FromType> & vec_from, PaddedPODArray<ToType> & vec_to, UInt8 week_mode, const DateLUTImpl & time_zone)
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{
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size_t size = vec_from.size();
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vec_to.resize(size);
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for (size_t i = 0; i < size; ++i)
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vec_to[i] = Transform::execute(vec_from[i], week_mode, time_zone);
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}
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};
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template <typename FromType, typename ToType, typename Transform>
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struct CustomWeekTransformImpl
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{
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static void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/)
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{
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using Op = Transformer<FromType, ToType, Transform>;
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UInt8 week_mode = DEFAULT_WEEK_MODE;
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if (arguments.size() > 1)
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{
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if (const auto week_mode_column = checkAndGetColumnConst<ColumnUInt8>(block.getByPosition(arguments[1]).column.get()))
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week_mode = week_mode_column->getValue<UInt8>();
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}
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const DateLUTImpl & time_zone = extractTimeZoneFromFunctionArguments(block, arguments, 2, 0);
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const ColumnPtr source_col = block.getByPosition(arguments[0]).column;
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if (const auto * sources = checkAndGetColumn<ColumnVector<FromType>>(source_col.get()))
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{
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auto col_to = ColumnVector<ToType>::create();
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Op::vector(sources->getData(), col_to->getData(), week_mode, time_zone);
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block.getByPosition(result).column = std::move(col_to);
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}
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else
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{
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throw Exception(
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"Illegal column " + block.getByPosition(arguments[0]).column->getName() + " of first argument of function "
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+ Transform::name,
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ErrorCodes::ILLEGAL_COLUMN);
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}
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}
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};
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}
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