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Add ReturnType template parameter to FormatImpl::execute

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vdimir 2021-07-12 16:02:15 +03:00
parent 32b174403e
commit b4c6a17eb2
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1 changed files with 42 additions and 37 deletions
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79
src/Functions/FunctionsConversion.h
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@ -576,77 +576,82 @@ template <typename Name> struct ConvertImpl<DataTypeDateTime, DataTypeDateTime64
/** Transformation of numbers, dates, datetimes to strings: through formatting.
*/
template <typename DataType, bool throws>
template <typename DataType>
struct FormatImpl
{
static bool execute(const typename DataType::FieldType x, WriteBuffer & wb, const DataType *, const DateLUTImpl *)
template <typename ReturnType = void>
static ReturnType execute(const typename DataType::FieldType x, WriteBuffer & wb, const DataType *, const DateLUTImpl *)
{
writeText(x, wb);
return true;
return ReturnType(true);
}
};
template <bool throws>
struct FormatImpl<DataTypeDate, throws>
template <>
struct FormatImpl<DataTypeDate>
{
static bool execute(const DataTypeDate::FieldType x, WriteBuffer & wb, const DataTypeDate *, const DateLUTImpl *)
template <typename ReturnType = void>
static ReturnType execute(const DataTypeDate::FieldType x, WriteBuffer & wb, const DataTypeDate *, const DateLUTImpl *)
{
writeDateText(DayNum(x), wb);
return true;
return ReturnType(true);
}
};
template <bool throws>
struct FormatImpl<DataTypeDateTime, throws>
template <>
struct FormatImpl<DataTypeDateTime>
{
static bool execute(const DataTypeDateTime::FieldType x, WriteBuffer & wb, const DataTypeDateTime *, const DateLUTImpl * time_zone)
template <typename ReturnType = void>
static ReturnType execute(const DataTypeDateTime::FieldType x, WriteBuffer & wb, const DataTypeDateTime *, const DateLUTImpl * time_zone)
{
writeDateTimeText(x, wb, *time_zone);
return true;
return ReturnType(true);
}
};
template <bool throws>
struct FormatImpl<DataTypeDateTime64, throws>
template <>
struct FormatImpl<DataTypeDateTime64>
{
static bool execute(const DataTypeDateTime64::FieldType x, WriteBuffer & wb, const DataTypeDateTime64 * type, const DateLUTImpl * time_zone)
template <typename ReturnType = void>
static ReturnType execute(const DataTypeDateTime64::FieldType x, WriteBuffer & wb, const DataTypeDateTime64 * type, const DateLUTImpl * time_zone)
{
writeDateTimeText(DateTime64(x), type->getScale(), wb, *time_zone);
return true;
return ReturnType(true);
}
};
template <typename FieldType>
struct FormatImpl<DataTypeEnum<FieldType>, false>
struct FormatImpl<DataTypeEnum<FieldType>>
{
static bool execute(const FieldType x, WriteBuffer & wb, const DataTypeEnum<FieldType> * type, const DateLUTImpl *)
template <typename ReturnType = void>
static ReturnType execute(const FieldType x, WriteBuffer & wb, const DataTypeEnum<FieldType> * type, const DateLUTImpl *)
{
StringRef res;
bool is_ok = type->getNameForValue(x, res);
if (is_ok)
writeString(res, wb);
return is_ok;
static constexpr bool throw_exception = std::is_same_v<ReturnType, void>;
if constexpr (throw_exception)
{
writeString(type->getNameForValue(x), wb);
}
else
{
StringRef res;
bool is_ok = type->getNameForValue(x, res);
if (is_ok)
writeString(res, wb);
return ReturnType(is_ok);
}
}
};
template <typename FieldType>
struct FormatImpl<DataTypeEnum<FieldType>, true>
struct FormatImpl<DataTypeDecimal<FieldType>>
{
static bool execute(const FieldType x, WriteBuffer & wb, const DataTypeEnum<FieldType> * type, const DateLUTImpl *)
{
writeString(type->getNameForValue(x), wb);
return true;
}
};
template <typename FieldType, bool throws>
struct FormatImpl<DataTypeDecimal<FieldType>, throws>
{
static bool execute(const FieldType x, WriteBuffer & wb, const DataTypeDecimal<FieldType> * type, const DateLUTImpl *)
template <typename ReturnType = void>
static ReturnType execute(const FieldType x, WriteBuffer & wb, const DataTypeDecimal<FieldType> * type, const DateLUTImpl *)
{
writeText(x, type->getScale(), wb);
return true;
return ReturnType(true);
}
};
@ -716,12 +721,12 @@ struct ConvertImpl<FromDataType, std::enable_if_t<!std::is_same_v<FromDataType,
{
if (null_map)
{
bool is_ok = FormatImpl<FromDataType, false>::execute(vec_from[i], write_buffer, &type, time_zone);
bool is_ok = FormatImpl<FromDataType>::template execute<bool>(vec_from[i], write_buffer, &type, time_zone);
null_map->getData()[i] |= !is_ok;
}
else
{
FormatImpl<FromDataType, true>::execute(vec_from[i], write_buffer, &type, time_zone);
FormatImpl<FromDataType>::template execute<void>(vec_from[i], write_buffer, &type, time_zone);
}
writeChar(0, write_buffer);
offsets_to[i] = write_buffer.count();