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https://github.com/ClickHouse/ClickHouse.git
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221 lines
9.8 KiB
C++
221 lines
9.8 KiB
C++
#include <DataTypes/DataTypeDateTime.h>
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#include <DataTypes/DataTypesNumber.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnsNumber.h>
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#include <Functions/IFunction.h>
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#include <Functions/FunctionHelpers.h>
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#include <Functions/FunctionFactory.h>
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#include <Functions/extractTimeZoneFromFunctionArguments.h>
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#include <Functions/DateTimeTransforms.h>
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#include <IO/WriteHelpers.h>
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#include <common/find_symbols.h>
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#include <type_traits>
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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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extern const int ILLEGAL_TYPE_OF_ARGUMENT;
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extern const int ILLEGAL_COLUMN;
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extern const int BAD_ARGUMENTS;
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}
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/** dateDiff('unit', t1, t2, [timezone])
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* t1 and t2 can be Date or DateTime
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*
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* If timezone is specified, it applied to both arguments.
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* If not, timezones from datatypes t1 and t2 are used.
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* If that timezones are not the same, the result is unspecified.
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*
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* Timezone matters because days can have different length.
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*/
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class FunctionDateDiff : public IFunction
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{
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public:
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static constexpr auto name = "dateDiff";
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static FunctionPtr create(const Context &) { return std::make_shared<FunctionDateDiff>(); }
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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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DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
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{
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if (arguments.size() != 3 && arguments.size() != 4)
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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 3 or 4",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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if (!isString(arguments[0]))
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throw Exception("First argument for function " + getName() + " (unit) must be String",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!isDateOrDateTime(arguments[1]))
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throw Exception("Second argument for function " + getName() + " must be Date or DateTime",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (!isDateOrDateTime(arguments[2]))
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throw Exception("Third argument for function " + getName() + " must be Date or DateTime",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (arguments.size() == 4 && !isString(arguments[3]))
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throw Exception("Fourth argument for function " + getName() + " (timezone) must be String",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return std::make_shared<DataTypeInt64>();
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}
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bool useDefaultImplementationForConstants() const override { return true; }
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ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {0, 3}; }
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void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
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{
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auto * unit_column = checkAndGetColumnConst<ColumnString>(block.getByPosition(arguments[0]).column.get());
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if (!unit_column)
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throw Exception("First argument for function " + getName() + " must be constant String", ErrorCodes::ILLEGAL_COLUMN);
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String unit = Poco::toLower(unit_column->getValue<String>());
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const IColumn & x = *block.getByPosition(arguments[1]).column;
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const IColumn & y = *block.getByPosition(arguments[2]).column;
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size_t rows = input_rows_count;
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auto res = ColumnInt64::create(rows);
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const DateLUTImpl & timezone_x = extractTimeZoneFromFunctionArguments(block, arguments, 3, 1);
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const DateLUTImpl & timezone_y = extractTimeZoneFromFunctionArguments(block, arguments, 3, 2);
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if (unit == "year" || unit == "yy" || unit == "yyyy")
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dispatchForColumns<ToRelativeYearNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else if (unit == "quarter" || unit == "qq" || unit == "q")
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dispatchForColumns<ToRelativeQuarterNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else if (unit == "month" || unit == "mm" || unit == "m")
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dispatchForColumns<ToRelativeMonthNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else if (unit == "week" || unit == "wk" || unit == "ww")
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dispatchForColumns<ToRelativeWeekNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else if (unit == "day" || unit == "dd" || unit == "d")
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dispatchForColumns<ToRelativeDayNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else if (unit == "hour" || unit == "hh")
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dispatchForColumns<ToRelativeHourNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else if (unit == "minute" || unit == "mi" || unit == "n")
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dispatchForColumns<ToRelativeMinuteNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else if (unit == "second" || unit == "ss" || unit == "s")
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dispatchForColumns<ToRelativeSecondNumImpl>(x, y, timezone_x, timezone_y, res->getData());
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else
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throw Exception("Function " + getName() + " does not support '" + unit + "' unit", ErrorCodes::BAD_ARGUMENTS);
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block.getByPosition(result).column = std::move(res);
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}
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private:
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template <typename Transform>
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void dispatchForColumns(
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const IColumn & x, const IColumn & y,
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const DateLUTImpl & timezone_x, const DateLUTImpl & timezone_y,
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ColumnInt64::Container & result)
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{
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if (auto * x_vec_16 = checkAndGetColumn<ColumnUInt16>(&x))
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dispatchForSecondColumn<Transform>(*x_vec_16, y, timezone_x, timezone_y, result);
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else if (auto * x_vec_32 = checkAndGetColumn<ColumnUInt32>(&x))
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dispatchForSecondColumn<Transform>(*x_vec_32, y, timezone_x, timezone_y, result);
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else if (auto * x_const_16 = checkAndGetColumnConst<ColumnUInt16>(&x))
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dispatchConstForSecondColumn<Transform>(x_const_16->getValue<UInt16>(), y, timezone_x, timezone_y, result);
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else if (auto * x_const_32 = checkAndGetColumnConst<ColumnUInt32>(&x))
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dispatchConstForSecondColumn<Transform>(x_const_32->getValue<UInt32>(), y, timezone_x, timezone_y, result);
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else
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throw Exception("Illegal column for first argument of function " + getName() + ", must be Date or DateTime", ErrorCodes::ILLEGAL_COLUMN);
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}
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template <typename Transform, typename T1>
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void dispatchForSecondColumn(
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const ColumnVector<T1> & x, const IColumn & y,
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const DateLUTImpl & timezone_x, const DateLUTImpl & timezone_y,
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ColumnInt64::Container & result)
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{
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if (auto * y_vec_16 = checkAndGetColumn<ColumnUInt16>(&y))
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vector_vector<Transform>(x, *y_vec_16, timezone_x, timezone_y, result);
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else if (auto * y_vec_32 = checkAndGetColumn<ColumnUInt32>(&y))
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vector_vector<Transform>(x, *y_vec_32, timezone_x, timezone_y, result);
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else if (auto * y_const_16 = checkAndGetColumnConst<ColumnUInt16>(&y))
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vector_constant<Transform>(x, y_const_16->getValue<UInt16>(), timezone_x, timezone_y, result);
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else if (auto * y_const_32 = checkAndGetColumnConst<ColumnUInt32>(&y))
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vector_constant<Transform>(x, y_const_32->getValue<UInt32>(), timezone_x, timezone_y, result);
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else
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throw Exception("Illegal column for second argument of function " + getName() + ", must be Date or DateTime", ErrorCodes::ILLEGAL_COLUMN);
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}
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template <typename Transform, typename T1>
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void dispatchConstForSecondColumn(
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T1 x, const IColumn & y,
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const DateLUTImpl & timezone_x, const DateLUTImpl & timezone_y,
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ColumnInt64::Container & result)
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{
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if (auto * y_vec_16 = checkAndGetColumn<ColumnUInt16>(&y))
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constant_vector<Transform>(x, *y_vec_16, timezone_x, timezone_y, result);
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else if (auto * y_vec_32 = checkAndGetColumn<ColumnUInt32>(&y))
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constant_vector<Transform>(x, *y_vec_32, timezone_x, timezone_y, result);
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else
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throw Exception("Illegal column for second argument of function " + getName() + ", must be Date or DateTime", ErrorCodes::ILLEGAL_COLUMN);
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}
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template <typename Transform, typename T1, typename T2>
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void vector_vector(
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const ColumnVector<T1> & x, const ColumnVector<T2> & y,
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const DateLUTImpl & timezone_x, const DateLUTImpl & timezone_y,
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ColumnInt64::Container & result)
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{
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const auto & x_data = x.getData();
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const auto & y_data = y.getData();
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for (size_t i = 0, size = x.size(); i < size; ++i)
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result[i] = calculate<Transform>(x_data[i], y_data[i], timezone_x, timezone_y);
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}
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template <typename Transform, typename T1, typename T2>
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void vector_constant(
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const ColumnVector<T1> & x, T2 y,
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const DateLUTImpl & timezone_x, const DateLUTImpl & timezone_y,
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ColumnInt64::Container & result)
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{
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const auto & x_data = x.getData();
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for (size_t i = 0, size = x.size(); i < size; ++i)
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result[i] = calculate<Transform>(x_data[i], y, timezone_x, timezone_y);
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}
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template <typename Transform, typename T1, typename T2>
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void constant_vector(
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T1 x, const ColumnVector<T2> & y,
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const DateLUTImpl & timezone_x, const DateLUTImpl & timezone_y,
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ColumnInt64::Container & result)
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{
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const auto & y_data = y.getData();
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for (size_t i = 0, size = y.size(); i < size; ++i)
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result[i] = calculate<Transform>(x, y_data[i], timezone_x, timezone_y);
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}
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template <typename Transform, typename T1, typename T2>
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Int64 calculate(T1 x, T2 y, const DateLUTImpl & timezone_x, const DateLUTImpl & timezone_y)
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{
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return Int64(Transform::execute(y, timezone_y))
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- Int64(Transform::execute(x, timezone_x));
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}
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};
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void registerFunctionDateDiff(FunctionFactory & factory)
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{
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factory.registerFunction<FunctionDateDiff>(FunctionFactory::CaseInsensitive);
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}
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}
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