thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-24 16:42:05 +00:00
Code Issues Packages Projects Releases Wiki Activity
082dbea039
ClickHouse/src/Functions/FunctionsConversion.h
alexey-milovidov be38b0fe75
Merge pull request #13497 from amosbird/tdm 
Better toDate/toDateTime functions.
2020-08-09 02:14:58 +03:00

2562 lines
114 KiB
C++
Raw Blame History

#pragma once
#include <ext/enumerate.h>
#include <ext/collection_cast.h>
#include <ext/range.h>
#include <type_traits>
#include <IO/WriteBufferFromVector.h>
#include <IO/ReadBufferFromMemory.h>
#include <IO/Operators.h>
#include <IO/parseDateTimeBestEffort.h>
#include <DataTypes/DataTypeFactory.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypesDecimal.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeFixedString.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeDateTime64.h>
#include <DataTypes/DataTypeEnum.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/DataTypeNothing.h>
#include <DataTypes/DataTypeUUID.h>
#include <DataTypes/DataTypeInterval.h>
#include <DataTypes/DataTypeAggregateFunction.h>
#include <Formats/FormatSettings.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnTuple.h>
#include <Columns/ColumnsCommon.h>
#include <Common/FieldVisitors.h>
#include <Common/assert_cast.h>
#include <Functions/IFunctionAdaptors.h>
#include <Functions/FunctionsMiscellaneous.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/DateTimeTransforms.h>
#include <DataTypes/DataTypeLowCardinality.h>
#include <Columns/ColumnLowCardinality.h>
#include <Functions/toFixedString.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ATTEMPT_TO_READ_AFTER_EOF;
extern const int CANNOT_PARSE_NUMBER;
extern const int CANNOT_READ_ARRAY_FROM_TEXT;
extern const int CANNOT_PARSE_INPUT_ASSERTION_FAILED;
extern const int CANNOT_PARSE_QUOTED_STRING;
extern const int CANNOT_PARSE_ESCAPE_SEQUENCE;
extern const int CANNOT_PARSE_DATE;
extern const int CANNOT_PARSE_DATETIME;
extern const int CANNOT_PARSE_TEXT;
extern const int CANNOT_PARSE_UUID;
extern const int TOO_FEW_ARGUMENTS_FOR_FUNCTION;
extern const int LOGICAL_ERROR;
extern const int TYPE_MISMATCH;
extern const int CANNOT_CONVERT_TYPE;
extern const int ILLEGAL_COLUMN;
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
extern const int NOT_IMPLEMENTED;
extern const int CANNOT_INSERT_NULL_IN_ORDINARY_COLUMN;
}
/** Type conversion functions.
* toType - conversion in "natural way";
*/
inline UInt32 extractToDecimalScale(const ColumnWithTypeAndName & named_column)
{
const auto * arg_type = named_column.type.get();
bool ok = checkAndGetDataType<DataTypeUInt64>(arg_type)
|| checkAndGetDataType<DataTypeUInt32>(arg_type)
|| checkAndGetDataType<DataTypeUInt16>(arg_type)
|| checkAndGetDataType<DataTypeUInt8>(arg_type);
if (!ok)
throw Exception("Illegal type of toDecimal() scale " + named_column.type->getName(), ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
Field field;
named_column.column->get(0, field);
return field.get<UInt32>();
}
/** Conversion of number types to each other, enums to numbers, dates and datetimes to numbers and back: done by straight assignment.
* (Date is represented internally as number of days from some day; DateTime - as unix timestamp)
*/
template <typename FromDataType, typename ToDataType, typename Name>
struct ConvertImpl
{
using FromFieldType = typename FromDataType::FieldType;
using ToFieldType = typename ToDataType::FieldType;
template <typename Additions = void *>
static void NO_SANITIZE_UNDEFINED execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/,
Additions additions [[maybe_unused]] = Additions())
{
const ColumnWithTypeAndName & named_from = block.getByPosition(arguments[0]);
using ColVecFrom = typename FromDataType::ColumnType;
using ColVecTo = typename ToDataType::ColumnType;
if constexpr ((IsDataTypeDecimal<FromDataType> || IsDataTypeDecimal<ToDataType>)
&& !(std::is_same_v<DataTypeDateTime64, FromDataType> || std::is_same_v<DataTypeDateTime64, ToDataType>))
{
if constexpr (!IsDataTypeDecimalOrNumber<FromDataType> || !IsDataTypeDecimalOrNumber<ToDataType>)
{
throw Exception("Illegal column " + named_from.column->getName() + " of first argument of function " + Name::name,
ErrorCodes::ILLEGAL_COLUMN);
}
}
if (const ColVecFrom * col_from = checkAndGetColumn<ColVecFrom>(named_from.column.get()))
{
typename ColVecTo::MutablePtr col_to = nullptr;
if constexpr (IsDataTypeDecimal<ToDataType>)
{
UInt32 scale = additions;
col_to = ColVecTo::create(0, scale);
}
else
col_to = ColVecTo::create();
const auto & vec_from = col_from->getData();
auto & vec_to = col_to->getData();
size_t size = vec_from.size();
vec_to.resize(size);
for (size_t i = 0; i < size; ++i)
{
if constexpr (IsDataTypeDecimal<FromDataType> || IsDataTypeDecimal<ToDataType>)
{
if constexpr (IsDataTypeDecimal<FromDataType> && IsDataTypeDecimal<ToDataType>)
vec_to[i] = convertDecimals<FromDataType, ToDataType>(vec_from[i], vec_from.getScale(), vec_to.getScale());
else if constexpr (IsDataTypeDecimal<FromDataType> && IsDataTypeNumber<ToDataType>)
vec_to[i] = convertFromDecimal<FromDataType, ToDataType>(vec_from[i], vec_from.getScale());
else if constexpr (IsDataTypeNumber<FromDataType> && IsDataTypeDecimal<ToDataType>)
vec_to[i] = convertToDecimal<FromDataType, ToDataType>(vec_from[i], vec_to.getScale());
else
throw Exception("Unsupported data type in conversion function", ErrorCodes::CANNOT_CONVERT_TYPE);
}
else
vec_to[i] = static_cast<ToFieldType>(vec_from[i]);
}
block.getByPosition(result).column = std::move(col_to);
}
else
throw Exception("Illegal column " + named_from.column->getName() + " of first argument of function " + Name::name,
ErrorCodes::ILLEGAL_COLUMN);
}
};
/** Conversion of DateTime to Date: throw off time component.
*/
template <typename Name> struct ConvertImpl<DataTypeDateTime, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeDateTime, DataTypeDate, ToDateImpl> {};
/** Conversion of Date to DateTime: adding 00:00:00 time component.
*/
struct ToDateTimeImpl
{
static constexpr auto name = "toDateTime";
static inline UInt32 execute(UInt16 d, const DateLUTImpl & time_zone)
{
return time_zone.fromDayNum(DayNum(d));
}
// no-op conversion from DateTime to DateTime, used in DateTime64 to DateTime conversion.
static inline UInt32 execute(UInt32 d, const DateLUTImpl & /*time_zone*/)
{
return d;
}
};
template <typename Name> struct ConvertImpl<DataTypeDate, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeDate, DataTypeDateTime, ToDateTimeImpl> {};
/// Implementation of toDate function.
template <typename FromType, typename ToType>
struct ToDateTransform32Or64
{
static constexpr auto name = "toDate";
static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl & time_zone)
{
return (from < 0xFFFF)
? from
: time_zone.toDayNum(std::min(time_t(from), time_t(0xFFFFFFFF)));
}
};
template <typename FromType, typename ToType>
struct ToDateTransform32Or64Signed
{
static constexpr auto name = "toDate";
static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl & time_zone)
{
/// The function should be monotonic (better for query optimizations), so we saturate instead of overflow.
if (from < 0)
return 0;
return (from < 0xFFFF)
? from
: time_zone.toDayNum(std::min(time_t(from), time_t(0xFFFFFFFF)));
}
};
template <typename FromType, typename ToType>
struct ToDateTransform8Or16Signed
{
static constexpr auto name = "toDate";
static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl &)
{
if (from < 0)
return 0;
return from;
}
};
/** Special case of converting Int8, Int16, (U)Int32 or (U)Int64 (and also, for convenience,
* Float32, Float64) to Date. If the number is negative, saturate it to unix epoch time. If the
* number is less than 65536, then it is treated as DayNum, and if it's greater or equals to 65536,
* then treated as unix timestamp. If the number exceeds UInt32, saturate to MAX_UINT32 then as DayNum.
* It's a bit illogical, as we actually have two functions in one.
* But allows to support frequent case,
* when user write toDate(UInt32), expecting conversion of unix timestamp to Date.
* (otherwise such usage would be frequent mistake).
*/
template <typename Name> struct ConvertImpl<DataTypeUInt32, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeUInt32, DataTypeDate, ToDateTransform32Or64<UInt32, UInt16>> {};
template <typename Name> struct ConvertImpl<DataTypeUInt64, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeUInt64, DataTypeDate, ToDateTransform32Or64<UInt64, UInt16>> {};
template <typename Name> struct ConvertImpl<DataTypeInt8, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeInt8, DataTypeDate, ToDateTransform8Or16Signed<Int8, UInt16>> {};
template <typename Name> struct ConvertImpl<DataTypeInt16, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeInt16, DataTypeDate, ToDateTransform8Or16Signed<Int16, UInt16>> {};
template <typename Name> struct ConvertImpl<DataTypeInt32, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeInt32, DataTypeDate, ToDateTransform32Or64Signed<Int32, UInt16>> {};
template <typename Name> struct ConvertImpl<DataTypeInt64, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeInt64, DataTypeDate, ToDateTransform32Or64Signed<Int64, UInt16>> {};
template <typename Name> struct ConvertImpl<DataTypeFloat32, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeFloat32, DataTypeDate, ToDateTransform32Or64Signed<Float32, UInt16>> {};
template <typename Name> struct ConvertImpl<DataTypeFloat64, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeFloat64, DataTypeDate, ToDateTransform32Or64Signed<Float64, UInt16>> {};
template <typename FromType, typename ToType>
struct ToDateTimeTransform64
{
static constexpr auto name = "toDateTime";
static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl &)
{
return std::min(time_t(from), time_t(0xFFFFFFFF));
}
};
template <typename FromType, typename ToType>
struct ToDateTimeTransformSigned
{
static constexpr auto name = "toDateTime";
static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl &)
{
if (from < 0)
return 0;
return from;
}
};
template <typename FromType, typename ToType>
struct ToDateTimeTransform64Signed
{
static constexpr auto name = "toDateTime";
static inline NO_SANITIZE_UNDEFINED ToType execute(const FromType & from, const DateLUTImpl &)
{
if (from < 0)
return 0;
return std::min(time_t(from), time_t(0xFFFFFFFF));
}
};
/** Special case of converting Int8, Int16, Int32 or (U)Int64 (and also, for convenience, Float32,
* Float64) to DateTime. If the number is negative, saturate it to unix epoch time. If the number
* exceeds UInt32, saturate to MAX_UINT32.
*/
template <typename Name> struct ConvertImpl<DataTypeInt8, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeInt8, DataTypeDateTime, ToDateTimeTransformSigned<Int8, UInt32>> {};
template <typename Name> struct ConvertImpl<DataTypeInt16, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeInt16, DataTypeDateTime, ToDateTimeTransformSigned<Int16, UInt32>> {};
template <typename Name> struct ConvertImpl<DataTypeInt32, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeInt32, DataTypeDateTime, ToDateTimeTransformSigned<Int32, UInt32>> {};
template <typename Name> struct ConvertImpl<DataTypeInt64, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeInt64, DataTypeDateTime, ToDateTimeTransform64Signed<Int64, UInt32>> {};
template <typename Name> struct ConvertImpl<DataTypeUInt64, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeUInt64, DataTypeDateTime, ToDateTimeTransform64<UInt64, UInt32>> {};
template <typename Name> struct ConvertImpl<DataTypeFloat32, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeFloat32, DataTypeDateTime, ToDateTimeTransform64Signed<Float32, UInt32>> {};
template <typename Name> struct ConvertImpl<DataTypeFloat64, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeFloat64, DataTypeDateTime, ToDateTimeTransform64Signed<Float64, UInt32>> {};
/** Conversion of Date or DateTime to DateTime64: add zero sub-second part.
*/
struct ToDateTime64Transform
{
static constexpr auto name = "toDateTime64";
const DateTime64::NativeType scale_multiplier = 1;
ToDateTime64Transform(UInt32 scale = 0)
: scale_multiplier(DecimalUtils::scaleMultiplier<DateTime64::NativeType>(scale))
{}
inline DateTime64::NativeType execute(UInt16 d, const DateLUTImpl & time_zone) const
{
const auto dt = ToDateTimeImpl::execute(d, time_zone);
return execute(dt, time_zone);
}
inline DateTime64::NativeType execute(UInt32 dt, const DateLUTImpl & /*time_zone*/) const
{
return DecimalUtils::decimalFromComponentsWithMultiplier<DateTime64>(dt, 0, scale_multiplier);
}
};
template <typename Name> struct ConvertImpl<DataTypeDate, DataTypeDateTime64, Name>
: DateTimeTransformImpl<DataTypeDate, DataTypeDateTime64, ToDateTime64Transform> {};
template <typename Name> struct ConvertImpl<DataTypeDateTime, DataTypeDateTime64, Name>
: DateTimeTransformImpl<DataTypeDateTime, DataTypeDateTime64, ToDateTime64Transform> {};
/** Conversion of DateTime64 to Date or DateTime: discards fractional part.
*/
template <typename Transform>
struct FromDateTime64Transform
{
static constexpr auto name = Transform::name;
const DateTime64::NativeType scale_multiplier = 1;
FromDateTime64Transform(UInt32 scale)
: scale_multiplier(DecimalUtils::scaleMultiplier<DateTime64::NativeType>(scale))
{}
inline auto execute(DateTime64::NativeType dt, const DateLUTImpl & time_zone) const
{
const auto c = DecimalUtils::splitWithScaleMultiplier(DateTime64(dt), scale_multiplier);
return Transform::execute(static_cast<UInt32>(c.whole), time_zone);
}
};
template <typename Name> struct ConvertImpl<DataTypeDateTime64, DataTypeDate, Name>
: DateTimeTransformImpl<DataTypeDateTime64, DataTypeDate, FromDateTime64Transform<ToDateImpl>> {};
template <typename Name> struct ConvertImpl<DataTypeDateTime64, DataTypeDateTime, Name>
: DateTimeTransformImpl<DataTypeDateTime64, DataTypeDateTime, FromDateTime64Transform<ToDateTimeImpl>> {};
/** Transformation of numbers, dates, datetimes to strings: through formatting.
*/
template <typename DataType>
struct FormatImpl
{
static void execute(const typename DataType::FieldType x, WriteBuffer & wb, const DataType *, const DateLUTImpl *)
{
writeText(x, wb);
}
};
template <>
struct FormatImpl<DataTypeDate>
{
static void execute(const DataTypeDate::FieldType x, WriteBuffer & wb, const DataTypeDate *, const DateLUTImpl *)
{
writeDateText(DayNum(x), wb);
}
};
template <>
struct FormatImpl<DataTypeDateTime>
{
static void execute(const DataTypeDateTime::FieldType x, WriteBuffer & wb, const DataTypeDateTime *, const DateLUTImpl * time_zone)
{
writeDateTimeText(x, wb, *time_zone);
}
};
template <>
struct FormatImpl<DataTypeDateTime64>
{
static void execute(const DataTypeDateTime64::FieldType x, WriteBuffer & wb, const DataTypeDateTime64 * type, const DateLUTImpl * time_zone)
{
writeDateTimeText(DateTime64(x), type->getScale(), wb, *time_zone);
}
};
template <typename FieldType>
struct FormatImpl<DataTypeEnum<FieldType>>
{
static void execute(const FieldType x, WriteBuffer & wb, const DataTypeEnum<FieldType> * type, const DateLUTImpl *)
{
writeString(type->getNameForValue(x), wb);
}
};
template <typename FieldType>
struct FormatImpl<DataTypeDecimal<FieldType>>
{
static void execute(const FieldType x, WriteBuffer & wb, const DataTypeDecimal<FieldType> * type, const DateLUTImpl *)
{
writeText(x, type->getScale(), wb);
}
};
/// DataTypeEnum<T> to DataType<T> free conversion
template <typename FieldType, typename Name>
struct ConvertImpl<DataTypeEnum<FieldType>, DataTypeNumber<FieldType>, Name>
{
static void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/)
{
block.getByPosition(result).column = block.getByPosition(arguments[0]).column;
}
};
template <typename FromDataType, typename Name>
struct ConvertImpl<FromDataType, std::enable_if_t<!std::is_same_v<FromDataType, DataTypeString>, DataTypeString>, Name>
{
using FromFieldType = typename FromDataType::FieldType;
using ColVecType = std::conditional_t<IsDecimalNumber<FromFieldType>, ColumnDecimal<FromFieldType>, ColumnVector<FromFieldType>>;
static void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/)
{
const auto & col_with_type_and_name = block.getByPosition(arguments[0]);
const auto & type = static_cast<const FromDataType &>(*col_with_type_and_name.type);
const DateLUTImpl * time_zone = nullptr;
/// For argument of DateTime type, second argument with time zone could be specified.
if constexpr (std::is_same_v<FromDataType, DataTypeDateTime> || std::is_same_v<FromDataType, DataTypeDateTime64>)
time_zone = &extractTimeZoneFromFunctionArguments(block, arguments, 1, 0);
if (const auto col_from = checkAndGetColumn<ColVecType>(col_with_type_and_name.column.get()))
{
auto col_to = ColumnString::create();
const typename ColVecType::Container & vec_from = col_from->getData();
ColumnString::Chars & data_to = col_to->getChars();
ColumnString::Offsets & offsets_to = col_to->getOffsets();
size_t size = vec_from.size();
if constexpr (std::is_same_v<FromDataType, DataTypeDate>)
data_to.resize(size * (strlen("YYYY-MM-DD") + 1));
else if constexpr (std::is_same_v<FromDataType, DataTypeDateTime>)
data_to.resize(size * (strlen("YYYY-MM-DD hh:mm:ss") + 1));
else if constexpr (std::is_same_v<FromDataType, DataTypeDateTime64>)
data_to.resize(size * (strlen("YYYY-MM-DD hh:mm:ss.") + vec_from.getScale() + 1));
else
data_to.resize(size * 3); /// Arbitrary
offsets_to.resize(size);
WriteBufferFromVector<ColumnString::Chars> write_buffer(data_to);
for (size_t i = 0; i < size; ++i)
{
FormatImpl<FromDataType>::execute(vec_from[i], write_buffer, &type, time_zone);
writeChar(0, write_buffer);
offsets_to[i] = write_buffer.count();
}
write_buffer.finalize();
block.getByPosition(result).column = std::move(col_to);
}
else
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of first argument of function " + Name::name,
ErrorCodes::ILLEGAL_COLUMN);
}
};
/// Generic conversion of any type to String.
struct ConvertImplGenericToString
{
static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
{
const auto & col_with_type_and_name = block.getByPosition(arguments[0]);
const IDataType & type = *col_with_type_and_name.type;
const IColumn & col_from = *col_with_type_and_name.column;
size_t size = col_from.size();
auto col_to = ColumnString::create();
ColumnString::Chars & data_to = col_to->getChars();
ColumnString::Offsets & offsets_to = col_to->getOffsets();
data_to.resize(size * 2); /// Using coefficient 2 for initial size is arbitrary.
offsets_to.resize(size);
WriteBufferFromVector<ColumnString::Chars> write_buffer(data_to);
FormatSettings format_settings;
for (size_t i = 0; i < size; ++i)
{
type.serializeAsText(col_from, i, write_buffer, format_settings);
writeChar(0, write_buffer);
offsets_to[i] = write_buffer.count();
}
write_buffer.finalize();
block.getByPosition(result).column = std::move(col_to);
}
};
/** Conversion of strings to numbers, dates, datetimes: through parsing.
*/
template <typename DataType>
void parseImpl(typename DataType::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
readText(x, rb);
}
template <>
inline void parseImpl<DataTypeDate>(DataTypeDate::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
DayNum tmp(0);
readDateText(tmp, rb);
x = tmp;
}
template <>
inline void parseImpl<DataTypeDateTime>(DataTypeDateTime::FieldType & x, ReadBuffer & rb, const DateLUTImpl * time_zone)
{
time_t tmp = 0;
readDateTimeText(tmp, rb, *time_zone);
x = tmp;
}
template <>
inline void parseImpl<DataTypeUUID>(DataTypeUUID::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
UUID tmp;
readText(tmp, rb);
x = tmp;
}
template <typename DataType>
bool tryParseImpl(typename DataType::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
if constexpr (std::is_floating_point_v<typename DataType::FieldType>)
return tryReadFloatText(x, rb);
else /*if constexpr (is_integral_v<typename DataType::FieldType>)*/
return tryReadIntText(x, rb);
}
template <>
inline bool tryParseImpl<DataTypeDate>(DataTypeDate::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
DayNum tmp(0);
if (!tryReadDateText(tmp, rb))
return false;
x = tmp;
return true;
}
template <>
inline bool tryParseImpl<DataTypeDateTime>(DataTypeDateTime::FieldType & x, ReadBuffer & rb, const DateLUTImpl * time_zone)
{
time_t tmp = 0;
if (!tryReadDateTimeText(tmp, rb, *time_zone))
return false;
x = tmp;
return true;
}
/** Throw exception with verbose message when string value is not parsed completely.
*/
[[noreturn]] inline void throwExceptionForIncompletelyParsedValue(ReadBuffer & read_buffer, Block & block, size_t result)
{
const IDataType & to_type = *block.getByPosition(result).type;
WriteBufferFromOwnString message_buf;
message_buf << "Cannot parse string " << quote << String(read_buffer.buffer().begin(), read_buffer.buffer().size())
<< " as " << to_type.getName()
<< ": syntax error";
if (read_buffer.offset())
message_buf << " at position " << read_buffer.offset()
<< " (parsed just " << quote << String(read_buffer.buffer().begin(), read_buffer.offset()) << ")";
else
message_buf << " at begin of string";
if (isNativeNumber(to_type))
message_buf << ". Note: there are to" << to_type.getName() << "OrZero and to" << to_type.getName() << "OrNull functions, which returns zero/NULL instead of throwing exception.";
throw Exception(message_buf.str(), ErrorCodes::CANNOT_PARSE_TEXT);
}
enum class ConvertFromStringExceptionMode
{
Throw, /// Throw exception if value cannot be parsed.
Zero, /// Fill with zero or default if value cannot be parsed.
Null /// Return ColumnNullable with NULLs when value cannot be parsed.
};
enum class ConvertFromStringParsingMode
{
Normal,
BestEffort, /// Only applicable for DateTime. Will use sophisticated method, that is slower.
BestEffortUS
};
template <typename FromDataType, typename ToDataType, typename Name,
ConvertFromStringExceptionMode exception_mode, ConvertFromStringParsingMode parsing_mode>
struct ConvertThroughParsing
{
static_assert(std::is_same_v<FromDataType, DataTypeString> || std::is_same_v<FromDataType, DataTypeFixedString>,
"ConvertThroughParsing is only applicable for String or FixedString data types");
static constexpr bool to_datetime64 = std::is_same_v<ToDataType, DataTypeDateTime64>;
using ToFieldType = typename ToDataType::FieldType;
static bool isAllRead(ReadBuffer & in)
{
/// In case of FixedString, skip zero bytes at end.
if constexpr (std::is_same_v<FromDataType, DataTypeFixedString>)
while (!in.eof() && *in.position() == 0)
++in.position();
if (in.eof())
return true;
/// Special case, that allows to parse string with DateTime as Date.
if (std::is_same_v<ToDataType, DataTypeDate> && (in.buffer().size()) == strlen("YYYY-MM-DD hh:mm:ss"))
return true;
return false;
}
template <typename Additions = void *>
static void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count,
Additions additions [[maybe_unused]] = Additions())
{
using ColVecTo = typename ToDataType::ColumnType;
const DateLUTImpl * local_time_zone [[maybe_unused]] = nullptr;
const DateLUTImpl * utc_time_zone [[maybe_unused]] = nullptr;
/// For conversion to DateTime type, second argument with time zone could be specified.
if constexpr (std::is_same_v<ToDataType, DataTypeDateTime> || to_datetime64)
{
const auto result_type = removeNullable(block.getByPosition(result).type);
// Time zone is already figured out during result type resolution, no need to do it here.
if (const auto dt_col = checkAndGetDataType<ToDataType>(result_type.get()))
local_time_zone = &dt_col->getTimeZone();
else
{
local_time_zone = &extractTimeZoneFromFunctionArguments(block, arguments, 1, 0);
}
if constexpr (parsing_mode == ConvertFromStringParsingMode::BestEffort || parsing_mode == ConvertFromStringParsingMode::BestEffortUS)
utc_time_zone = &DateLUT::instance("UTC");
}
const IColumn * col_from = block.getByPosition(arguments[0]).column.get();
const ColumnString * col_from_string = checkAndGetColumn<ColumnString>(col_from);
const ColumnFixedString * col_from_fixed_string = checkAndGetColumn<ColumnFixedString>(col_from);
if (std::is_same_v<FromDataType, DataTypeString> && !col_from_string)
throw Exception("Illegal column " + col_from->getName()
+ " of first argument of function " + Name::name,
ErrorCodes::ILLEGAL_COLUMN);
if (std::is_same_v<FromDataType, DataTypeFixedString> && !col_from_fixed_string)
throw Exception("Illegal column " + col_from->getName()
+ " of first argument of function " + Name::name,
ErrorCodes::ILLEGAL_COLUMN);
size_t size = input_rows_count;
typename ColVecTo::MutablePtr col_to = nullptr;
if constexpr (IsDataTypeDecimal<ToDataType>)
{
UInt32 scale = additions;
if constexpr (to_datetime64)
{
ToDataType check_bounds_in_ctor(scale, local_time_zone ? local_time_zone->getTimeZone() : String{});
}
else
{
ToDataType check_bounds_in_ctor(ToDataType::maxPrecision(), scale);
}
col_to = ColVecTo::create(size, scale);
}
else
col_to = ColVecTo::create(size);
typename ColVecTo::Container & vec_to = col_to->getData();
ColumnUInt8::MutablePtr col_null_map_to;
ColumnUInt8::Container * vec_null_map_to [[maybe_unused]] = nullptr;
if constexpr (exception_mode == ConvertFromStringExceptionMode::Null)
{
col_null_map_to = ColumnUInt8::create(size);
vec_null_map_to = &col_null_map_to->getData();
}
const ColumnString::Chars * chars = nullptr;
const IColumn::Offsets * offsets = nullptr;
size_t fixed_string_size = 0;
if constexpr (std::is_same_v<FromDataType, DataTypeString>)
{
chars = &col_from_string->getChars();
offsets = &col_from_string->getOffsets();
}
else
{
chars = &col_from_fixed_string->getChars();
fixed_string_size = col_from_fixed_string->getN();
}
size_t current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
size_t next_offset = std::is_same_v<FromDataType, DataTypeString> ? (*offsets)[i] : (current_offset + fixed_string_size);
size_t string_size = std::is_same_v<FromDataType, DataTypeString> ? next_offset - current_offset - 1 : fixed_string_size;
ReadBufferFromMemory read_buffer(&(*chars)[current_offset], string_size);
if constexpr (exception_mode == ConvertFromStringExceptionMode::Throw)
{
if constexpr (parsing_mode == ConvertFromStringParsingMode::BestEffort)
{
if constexpr (to_datetime64)
{
DateTime64 res = 0;
parseDateTime64BestEffort(res, vec_to.getScale(), read_buffer, *local_time_zone, *utc_time_zone);
vec_to[i] = res;
}
else
{
time_t res;
parseDateTimeBestEffort(res, read_buffer, *local_time_zone, *utc_time_zone);
vec_to[i] = res;
}
}
else if constexpr (parsing_mode == ConvertFromStringParsingMode::BestEffortUS)
{
time_t res;
parseDateTimeBestEffortUS(res, read_buffer, *local_time_zone, *utc_time_zone);
vec_to[i] = res;
}
else
{
if constexpr (to_datetime64)
{
DateTime64 value = 0;
readDateTime64Text(value, vec_to.getScale(), read_buffer, *local_time_zone);
vec_to[i] = value;
}
else if constexpr (IsDataTypeDecimal<ToDataType>)
ToDataType::readText(vec_to[i], read_buffer, ToDataType::maxPrecision(), vec_to.getScale());
else
parseImpl<ToDataType>(vec_to[i], read_buffer, local_time_zone);
}
if (!isAllRead(read_buffer))
throwExceptionForIncompletelyParsedValue(read_buffer, block, result);
}
else
{
bool parsed;
if constexpr (parsing_mode == ConvertFromStringParsingMode::BestEffort)
{
if constexpr (to_datetime64)
{
DateTime64 res = 0;
parsed = tryParseDateTime64BestEffort(res, vec_to.getScale(), read_buffer, *local_time_zone, *utc_time_zone);
vec_to[i] = res;
}
else
{
time_t res;
parsed = tryParseDateTimeBestEffort(res, read_buffer, *local_time_zone, *utc_time_zone);
vec_to[i] = res;
}
}
else
{
if constexpr (to_datetime64)
{
DateTime64 value = 0;
parsed = tryReadDateTime64Text(value, vec_to.getScale(), read_buffer, *local_time_zone);
vec_to[i] = value;
}
else if constexpr (IsDataTypeDecimal<ToDataType>)
parsed = ToDataType::tryReadText(vec_to[i], read_buffer, ToDataType::maxPrecision(), vec_to.getScale());
else
parsed = tryParseImpl<ToDataType>(vec_to[i], read_buffer, local_time_zone);
}
parsed = parsed && isAllRead(read_buffer);
if (!parsed)
vec_to[i] = 0;
if constexpr (exception_mode == ConvertFromStringExceptionMode::Null)
(*vec_null_map_to)[i] = !parsed;
}
current_offset = next_offset;
}
if constexpr (exception_mode == ConvertFromStringExceptionMode::Null)
block.getByPosition(result).column = ColumnNullable::create(std::move(col_to), std::move(col_null_map_to));
else
block.getByPosition(result).column = std::move(col_to);
}
};
template <typename ToDataType, typename Name>
struct ConvertImpl<std::enable_if_t<!std::is_same_v<ToDataType, DataTypeString>, DataTypeString>, ToDataType, Name>
: ConvertThroughParsing<DataTypeString, ToDataType, Name, ConvertFromStringExceptionMode::Throw, ConvertFromStringParsingMode::Normal> {};
template <typename ToDataType, typename Name>
struct ConvertImpl<std::enable_if_t<!std::is_same_v<ToDataType, DataTypeFixedString>, DataTypeFixedString>, ToDataType, Name>
: ConvertThroughParsing<DataTypeFixedString, ToDataType, Name, ConvertFromStringExceptionMode::Throw, ConvertFromStringParsingMode::Normal> {};
/// Generic conversion of any type from String. Used for complex types: Array and Tuple.
struct ConvertImplGenericFromString
{
static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
{
const IColumn & col_from = *block.getByPosition(arguments[0]).column;
size_t size = col_from.size();
const IDataType & data_type_to = *block.getByPosition(result).type;
if (const ColumnString * col_from_string = checkAndGetColumn<ColumnString>(&col_from))
{
auto res = data_type_to.createColumn();
IColumn & column_to = *res;
column_to.reserve(size);
const ColumnString::Chars & chars = col_from_string->getChars();
const IColumn::Offsets & offsets = col_from_string->getOffsets();
size_t current_offset = 0;
FormatSettings format_settings;
for (size_t i = 0; i < size; ++i)
{
ReadBufferFromMemory read_buffer(&chars[current_offset], offsets[i] - current_offset - 1);
data_type_to.deserializeAsWholeText(column_to, read_buffer, format_settings);
if (!read_buffer.eof())
throwExceptionForIncompletelyParsedValue(read_buffer, block, result);
current_offset = offsets[i];
}
block.getByPosition(result).column = std::move(res);
}
else
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of first argument of conversion function from string",
ErrorCodes::ILLEGAL_COLUMN);
}
};
/// Function toUnixTimestamp has exactly the same implementation as toDateTime of String type.
struct NameToUnixTimestamp { static constexpr auto name = "toUnixTimestamp"; };
template <>
struct ConvertImpl<DataTypeString, DataTypeUInt32, NameToUnixTimestamp>
: ConvertImpl<DataTypeString, DataTypeDateTime, NameToUnixTimestamp> {};
/** If types are identical, just take reference to column.
*/
template <typename T, typename Name>
struct ConvertImpl<std::enable_if_t<!T::is_parametric, T>, T, Name>
{
static void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/)
{
block.getByPosition(result).column = block.getByPosition(arguments[0]).column;
}
};
/** Conversion from FixedString to String.
* Cutting sequences of zero bytes from end of strings.
*/
template <typename Name>
struct ConvertImpl<DataTypeFixedString, DataTypeString, Name>
{
static void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t /*input_rows_count*/)
{
if (const ColumnFixedString * col_from = checkAndGetColumn<ColumnFixedString>(block.getByPosition(arguments[0]).column.get()))
{
auto col_to = ColumnString::create();
const ColumnFixedString::Chars & data_from = col_from->getChars();
ColumnString::Chars & data_to = col_to->getChars();
ColumnString::Offsets & offsets_to = col_to->getOffsets();
size_t size = col_from->size();
size_t n = col_from->getN();
data_to.resize(size * (n + 1)); /// + 1 - zero terminator
offsets_to.resize(size);
size_t offset_from = 0;
size_t offset_to = 0;
for (size_t i = 0; i < size; ++i)
{
size_t bytes_to_copy = n;
while (bytes_to_copy > 0 && data_from[offset_from + bytes_to_copy - 1] == 0)
--bytes_to_copy;
memcpy(&data_to[offset_to], &data_from[offset_from], bytes_to_copy);
offset_from += n;
offset_to += bytes_to_copy;
data_to[offset_to] = 0;
++offset_to;
offsets_to[i] = offset_to;
}
data_to.resize(offset_to);
block.getByPosition(result).column = std::move(col_to);
}
else
throw Exception("Illegal column " + block.getByPosition(arguments[0]).column->getName()
+ " of first argument of function " + Name::name,
ErrorCodes::ILLEGAL_COLUMN);
}
};
/// Declared early because used below.
struct NameToDate { static constexpr auto name = "toDate"; };
struct NameToDateTime { static constexpr auto name = "toDateTime"; };
struct NameToDateTime64 { static constexpr auto name = "toDateTime64"; };
struct NameToString { static constexpr auto name = "toString"; };
struct NameToDecimal32 { static constexpr auto name = "toDecimal32"; };
struct NameToDecimal64 { static constexpr auto name = "toDecimal64"; };
struct NameToDecimal128 { static constexpr auto name = "toDecimal128"; };
#define DEFINE_NAME_TO_INTERVAL(INTERVAL_KIND) \
struct NameToInterval ## INTERVAL_KIND \
{ \
static constexpr auto name = "toInterval" #INTERVAL_KIND; \
static constexpr auto kind = IntervalKind::INTERVAL_KIND; \
};
DEFINE_NAME_TO_INTERVAL(Second)
DEFINE_NAME_TO_INTERVAL(Minute)
DEFINE_NAME_TO_INTERVAL(Hour)
DEFINE_NAME_TO_INTERVAL(Day)
DEFINE_NAME_TO_INTERVAL(Week)
DEFINE_NAME_TO_INTERVAL(Month)
DEFINE_NAME_TO_INTERVAL(Quarter)
DEFINE_NAME_TO_INTERVAL(Year)
#undef DEFINE_NAME_TO_INTERVAL
template <typename ToDataType, typename Name, typename MonotonicityImpl>
class FunctionConvert : public IFunction
{
public:
using Monotonic = MonotonicityImpl;
static constexpr auto name = Name::name;
static constexpr bool to_decimal =
std::is_same_v<Name, NameToDecimal32> || std::is_same_v<Name, NameToDecimal64> || std::is_same_v<Name, NameToDecimal128>;
static constexpr bool to_datetime64 = std::is_same_v<ToDataType, DataTypeDateTime64>;
static FunctionPtr create(const Context &) { return std::make_shared<FunctionConvert>(); }
static FunctionPtr create() { return std::make_shared<FunctionConvert>(); }
String getName() const override
{
return name;
}
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool isInjective(const Block &) const override { return std::is_same_v<Name, NameToString>; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
FunctionArgumentDescriptors mandatory_args = {{"Value", nullptr, nullptr, nullptr}};
FunctionArgumentDescriptors optional_args;
if constexpr (to_decimal || to_datetime64)
{
mandatory_args.push_back({"scale", &isNativeInteger, &isColumnConst, "const Integer"});
}
// toString(DateTime or DateTime64, [timezone: String])
if ((std::is_same_v<Name, NameToString> && arguments.size() > 0 && (isDateTime64(arguments[0].type) || isDateTime(arguments[0].type)))
// toUnixTimestamp(value[, timezone : String])
|| std::is_same_v<Name, NameToUnixTimestamp>
// toDate(value[, timezone : String])
|| std::is_same_v<ToDataType, DataTypeDate> // TODO: shall we allow timestamp argument for toDate? DateTime knows nothing about timezones and this argument is ignored below.
// toDateTime(value[, timezone: String])
|| std::is_same_v<ToDataType, DataTypeDateTime>
// toDateTime64(value, scale : Integer[, timezone: String])
|| std::is_same_v<ToDataType, DataTypeDateTime64>)
{
optional_args.push_back({"timezone", &isString, &isColumnConst, "const String"});
}
validateFunctionArgumentTypes(*this, arguments, mandatory_args, optional_args);
if constexpr (std::is_same_v<ToDataType, DataTypeInterval>)
{
return std::make_shared<DataTypeInterval>(Name::kind);
}
else if constexpr (to_decimal)
{
// if (!arguments[1].column)
// throw Exception("Second argument for function " + getName() + " must be constant", ErrorCodes::ILLEGAL_COLUMN);
UInt64 scale = extractToDecimalScale(arguments[1]);
if constexpr (std::is_same_v<Name, NameToDecimal32>)
return createDecimal<DataTypeDecimal>(9, scale);
else if constexpr (std::is_same_v<Name, NameToDecimal64>)
return createDecimal<DataTypeDecimal>(18, scale);
else if constexpr (std::is_same_v<Name, NameToDecimal128>)
return createDecimal<DataTypeDecimal>(38, scale);
throw Exception("Something wrong with toDecimalNN()", ErrorCodes::LOGICAL_ERROR);
}
else
{
// Optional second argument with time zone for DateTime.
UInt8 timezone_arg_position = 1;
UInt32 scale [[maybe_unused]] = DataTypeDateTime64::default_scale;
// DateTime64 requires more arguments: scale and timezone. Since timezone is optional, scale should be first.
if constexpr (to_datetime64)
{
timezone_arg_position += 1;
scale = static_cast<UInt32>(arguments[1].column->get64(0));
}
if constexpr (std::is_same_v<ToDataType, DataTypeDateTime>)
return std::make_shared<DataTypeDateTime>(extractTimeZoneNameFromFunctionArguments(arguments, timezone_arg_position, 0));
else if constexpr (to_datetime64)
return std::make_shared<DataTypeDateTime64>(scale, extractTimeZoneNameFromFunctionArguments(arguments, timezone_arg_position, 0));
else
return std::make_shared<ToDataType>();
}
}
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
bool canBeExecutedOnDefaultArguments() const override { return false; }
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const override
{
try
{
executeInternal(block, arguments, result, input_rows_count);
}
catch (Exception & e)
{
/// More convenient error message.
if (e.code() == ErrorCodes::ATTEMPT_TO_READ_AFTER_EOF)
{
e.addMessage("Cannot parse "
+ block.getByPosition(result).type->getName() + " from "
+ block.getByPosition(arguments[0]).type->getName()
+ ", because value is too short");
}
else if (e.code() == ErrorCodes::CANNOT_PARSE_NUMBER
|| e.code() == ErrorCodes::CANNOT_READ_ARRAY_FROM_TEXT
|| e.code() == ErrorCodes::CANNOT_PARSE_INPUT_ASSERTION_FAILED
|| e.code() == ErrorCodes::CANNOT_PARSE_QUOTED_STRING
|| e.code() == ErrorCodes::CANNOT_PARSE_ESCAPE_SEQUENCE
|| e.code() == ErrorCodes::CANNOT_PARSE_DATE
|| e.code() == ErrorCodes::CANNOT_PARSE_DATETIME
|| e.code() == ErrorCodes::CANNOT_PARSE_UUID)
{
e.addMessage("Cannot parse "
+ block.getByPosition(result).type->getName() + " from "
+ block.getByPosition(arguments[0]).type->getName());
}
throw;
}
}
bool hasInformationAboutMonotonicity() const override
{
return Monotonic::has();
}
Monotonicity getMonotonicityForRange(const IDataType & type, const Field & left, const Field & right) const override
{
return Monotonic::get(type, left, right);
}
private:
void executeInternal(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const
{
if (!arguments.size())
throw Exception{"Function " + getName() + " expects at least 1 arguments",
ErrorCodes::TOO_FEW_ARGUMENTS_FOR_FUNCTION};
const IDataType * from_type = block.getByPosition(arguments[0]).type.get();
auto call = [&](const auto & types) -> bool
{
using Types = std::decay_t<decltype(types)>;
using LeftDataType = typename Types::LeftType;
using RightDataType = typename Types::RightType;
if constexpr (IsDataTypeDecimal<RightDataType>)
{
if constexpr (std::is_same_v<RightDataType, DataTypeDateTime64>)
{
// account for optional timezone argument
if (arguments.size() != 2 && arguments.size() != 3)
throw Exception{"Function " + getName() + " expects 2 or 3 arguments for DataTypeDateTime64.",
ErrorCodes::TOO_FEW_ARGUMENTS_FOR_FUNCTION};
}
else if (arguments.size() != 2)
{
throw Exception{"Function " + getName() + " expects 2 arguments for Decimal.",
ErrorCodes::TOO_FEW_ARGUMENTS_FOR_FUNCTION};
}
const ColumnWithTypeAndName & scale_column = block.getByPosition(arguments[1]);
UInt32 scale = extractToDecimalScale(scale_column);
ConvertImpl<LeftDataType, RightDataType, Name>::execute(block, arguments, result, input_rows_count, scale);
}
else if constexpr (IsDataTypeDateOrDateTime<RightDataType> && std::is_same_v<LeftDataType, DataTypeDateTime64>)
{
const auto * dt64 = assert_cast<const DataTypeDateTime64 *>(block.getByPosition(arguments[0]).type.get());
ConvertImpl<LeftDataType, RightDataType, Name>::execute(block, arguments, result, input_rows_count, dt64->getScale());
}
else
ConvertImpl<LeftDataType, RightDataType, Name>::execute(block, arguments, result, input_rows_count);
return true;
};
bool done = callOnIndexAndDataType<ToDataType>(from_type->getTypeId(), call);
if (!done)
{
/// Generic conversion of any type to String.
if (std::is_same_v<ToDataType, DataTypeString>)
{
ConvertImplGenericToString::execute(block, arguments, result);
}
else
throw Exception("Illegal type " + block.getByPosition(arguments[0]).type->getName() + " of argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
}
};
/** Function toTOrZero (where T is number of date or datetime type):
* try to convert from String to type T through parsing,
* if cannot parse, return default value instead of throwing exception.
* Function toTOrNull will return Nullable type with NULL when cannot parse.
* NOTE Also need to implement tryToUnixTimestamp with timezone.
*/
template <typename ToDataType, typename Name,
ConvertFromStringExceptionMode exception_mode,
ConvertFromStringParsingMode parsing_mode = ConvertFromStringParsingMode::Normal>
class FunctionConvertFromString : public IFunction
{
public:
static constexpr auto name = Name::name;
static constexpr bool to_decimal =
std::is_same_v<ToDataType, DataTypeDecimal<Decimal32>> ||
std::is_same_v<ToDataType, DataTypeDecimal<Decimal64>> ||
std::is_same_v<ToDataType, DataTypeDecimal<Decimal128>>;
static constexpr bool to_datetime64 = std::is_same_v<ToDataType, DataTypeDateTime64>;
static FunctionPtr create(const Context &) { return std::make_shared<FunctionConvertFromString>(); }
static FunctionPtr create() { return std::make_shared<FunctionConvertFromString>(); }
String getName() const override
{
return name;
}
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
bool useDefaultImplementationForConstants() const override { return true; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
DataTypePtr res;
if constexpr (to_datetime64)
{
validateFunctionArgumentTypes(*this, arguments,
FunctionArgumentDescriptors{{"string", isStringOrFixedString, nullptr, "String or FixedString"}},
// optional
FunctionArgumentDescriptors{
{"precision", isUInt8, isColumnConst, "const UInt8"},
{"timezone", isStringOrFixedString, isColumnConst, "const String or FixedString"},
});
UInt64 scale = DataTypeDateTime64::default_scale;
if (arguments.size() > 1)
scale = extractToDecimalScale(arguments[1]);
const auto timezone = extractTimeZoneNameFromFunctionArguments(arguments, 2, 0);
res = std::make_shared<DataTypeDateTime64>(scale, timezone);
}
else
{
if ((arguments.size() != 1 && arguments.size() != 2) || (to_decimal && arguments.size() != 2))
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed " + toString(arguments.size()) +
", should be 1 or 2. Second argument only make sense for DateTime (time zone, optional) and Decimal (scale).",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
if (!isStringOrFixedString(arguments[0].type))
{
if (this->getName().find("OrZero") != std::string::npos ||
this->getName().find("OrNull") != std::string::npos)
throw Exception("Illegal type " + arguments[0].type->getName() + " of first argument of function " + getName() +
". Conversion functions with postfix 'OrZero' or 'OrNull' should take String argument",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
else
throw Exception("Illegal type " + arguments[0].type->getName() + " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
if (arguments.size() == 2)
{
if constexpr (std::is_same_v<ToDataType, DataTypeDateTime>)
{
if (!isString(arguments[1].type))
throw Exception("Illegal type " + arguments[1].type->getName() + " of 2nd argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
else if constexpr (to_decimal)
{
if (!isInteger(arguments[1].type))
throw Exception("Illegal type " + arguments[1].type->getName() + " of 2nd argument of function " + getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
if (!arguments[1].column)
throw Exception("Second argument for function " + getName() + " must be constant", ErrorCodes::ILLEGAL_COLUMN);
}
else
{
throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
+ toString(arguments.size()) + ", should be 1. Second argument makes sense only for DateTime and Decimal.",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
}
}
if constexpr (std::is_same_v<ToDataType, DataTypeDateTime>)
res = std::make_shared<DataTypeDateTime>(extractTimeZoneNameFromFunctionArguments(arguments, 1, 0));
else if constexpr (to_decimal)
{
UInt64 scale = extractToDecimalScale(arguments[1]);
if constexpr (std::is_same_v<ToDataType, DataTypeDecimal<Decimal32>>)
res = createDecimal<DataTypeDecimal>(9, scale);
else if constexpr (std::is_same_v<ToDataType, DataTypeDecimal<Decimal64>>)
res = createDecimal<DataTypeDecimal>(18, scale);
else if constexpr (std::is_same_v<ToDataType, DataTypeDecimal<Decimal128>>)
res = createDecimal<DataTypeDecimal>(38, scale);
if (!res)
throw Exception("Something wrong with toDecimalNNOrZero() or toDecimalNNOrNull()", ErrorCodes::LOGICAL_ERROR);
}
else
res = std::make_shared<ToDataType>();
}
if constexpr (exception_mode == ConvertFromStringExceptionMode::Null)
res = std::make_shared<DataTypeNullable>(res);
return res;
}
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) const override
{
const IDataType * from_type = block.getByPosition(arguments[0]).type.get();
bool ok = true;
if constexpr (to_decimal || to_datetime64)
{
const UInt32 scale = assert_cast<const ToDataType &>(*removeNullable(block.getByPosition(result).type)).getScale();
if (checkAndGetDataType<DataTypeString>(from_type))
{
ConvertThroughParsing<DataTypeString, ToDataType, Name, exception_mode, parsing_mode>::execute(
block, arguments, result, input_rows_count, scale);
}
else if (checkAndGetDataType<DataTypeFixedString>(from_type))
{
ConvertThroughParsing<DataTypeFixedString, ToDataType, Name, exception_mode, parsing_mode>::execute(
block, arguments, result, input_rows_count, scale);
}
else
ok = false;
}
else
{
if (checkAndGetDataType<DataTypeString>(from_type))
{
ConvertThroughParsing<DataTypeString, ToDataType, Name, exception_mode, parsing_mode>::execute(
block, arguments, result, input_rows_count);
}
else if (checkAndGetDataType<DataTypeFixedString>(from_type))
{
ConvertThroughParsing<DataTypeFixedString, ToDataType, Name, exception_mode, parsing_mode>::execute(
block, arguments, result, input_rows_count);
}
else
ok = false;
}
if (!ok)
throw Exception("Illegal type " + block.getByPosition(arguments[0]).type->getName() + " of argument of function " + getName()
+ ". Only String or FixedString argument is accepted for try-conversion function."
+ " For other arguments, use function without 'orZero' or 'orNull'.",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
}
};
/// Monotonicity.
struct PositiveMonotonicity
{
static bool has() { return true; }
static IFunction::Monotonicity get(const IDataType &, const Field &, const Field &)
{
return { true };
}
};
struct UnknownMonotonicity
{
static bool has() { return false; }
static IFunction::Monotonicity get(const IDataType &, const Field &, const Field &)
{
return { false };
}
};
template <typename T>
struct ToNumberMonotonicity
{
static bool has() { return true; }
static UInt64 divideByRangeOfType(UInt64 x)
{
if constexpr (sizeof(T) < sizeof(UInt64))
return x >> (sizeof(T) * 8);
else
return 0;
}
static IFunction::Monotonicity get(const IDataType & type, const Field & left, const Field & right)
{
if (!type.isValueRepresentedByNumber())
return {};
/// If type is same, the conversion is always monotonic.
/// (Enum has separate case, because it is different data type)
if (checkAndGetDataType<DataTypeNumber<T>>(&type) ||
checkAndGetDataType<DataTypeEnum<T>>(&type))
return { true, true, true };
/// Float cases.
/// When converting to Float, the conversion is always monotonic.
if (std::is_floating_point_v<T>)
return {true, true, true};
/// If converting from Float, for monotonicity, arguments must fit in range of result type.
if (WhichDataType(type).isFloat())
{
if (left.isNull() || right.isNull())
return {};
Float64 left_float = left.get<Float64>();
Float64 right_float = right.get<Float64>();
if (left_float >= std::numeric_limits<T>::min() && left_float <= std::numeric_limits<T>::max()
&& right_float >= std::numeric_limits<T>::min() && right_float <= std::numeric_limits<T>::max())
return { true };
return {};
}
/// Integer cases.
const bool from_is_unsigned = type.isValueRepresentedByUnsignedInteger();
const bool to_is_unsigned = is_unsigned_v<T>;
const size_t size_of_from = type.getSizeOfValueInMemory();
const size_t size_of_to = sizeof(T);
const bool left_in_first_half = left.isNull()
? from_is_unsigned
: (left.get<Int64>() >= 0);
const bool right_in_first_half = right.isNull()
? !from_is_unsigned
: (right.get<Int64>() >= 0);
/// Size of type is the same.
if (size_of_from == size_of_to)
{
if (from_is_unsigned == to_is_unsigned)
return {true, true, true};
if (left_in_first_half == right_in_first_half)
return {true};
return {};
}
/// Size of type is expanded.
if (size_of_from < size_of_to)
{
if (from_is_unsigned == to_is_unsigned)
return {true, true, true};
if (!to_is_unsigned)
return {true, true, true};
/// signed -> unsigned. If arguments from the same half, then function is monotonic.
if (left_in_first_half == right_in_first_half)
return {true};
return {};
}
/// Size of type is shrunk.
if (size_of_from > size_of_to)
{
/// Function cannot be monotonic on unbounded ranges.
if (left.isNull() || right.isNull())
return {};
if (from_is_unsigned == to_is_unsigned)
{
/// all bits other than that fits, must be same.
if (divideByRangeOfType(left.get<UInt64>()) == divideByRangeOfType(right.get<UInt64>()))
return {true};
return {};
}
else
{
/// When signedness is changed, it's also required for arguments to be from the same half.
/// And they must be in the same half after converting to the result type.
if (left_in_first_half == right_in_first_half
&& (T(left.get<Int64>()) >= 0) == (T(right.get<Int64>()) >= 0)
&& divideByRangeOfType(left.get<UInt64>()) == divideByRangeOfType(right.get<UInt64>()))
return {true};
return {};
}
}
__builtin_unreachable();
}
};
struct ToDateMonotonicity
{
static bool has() { return true; }
static IFunction::Monotonicity get(const IDataType & type, const Field & left, const Field & right)
{
auto which = WhichDataType(type);
if (which.isDateOrDateTime() || which.isInt8() || which.isInt16() || which.isUInt8() || which.isUInt16())
return {true, true, true};
else if (
(which.isUInt() && ((left.isNull() || left.get<UInt64>() < 0xFFFF) && (right.isNull() || right.get<UInt64>() >= 0xFFFF)))
|| (which.isInt() && ((left.isNull() || left.get<Int64>() < 0xFFFF) && (right.isNull() || right.get<Int64>() >= 0xFFFF)))
|| (which.isFloat() && ((left.isNull() || left.get<Float64>() < 0xFFFF) && (right.isNull() || right.get<Float64>() >= 0xFFFF)))
|| !type.isValueRepresentedByNumber())
return {};
else
return {true, true, true};
}
};
struct ToDateTimeMonotonicity
{
static bool has() { return true; }
static IFunction::Monotonicity get(const IDataType & type, const Field &, const Field &)
{
if (type.isValueRepresentedByNumber())
return {true, true, true};
else
return {};
}
};
/** The monotonicity for the `toString` function is mainly determined for test purposes.
* It is doubtful that anyone is looking to optimize queries with conditions `toString(CounterID) = 34`.
*/
struct ToStringMonotonicity
{
static bool has() { return true; }
static IFunction::Monotonicity get(const IDataType & type, const Field & left, const Field & right)
{
IFunction::Monotonicity positive(true, true);
IFunction::Monotonicity not_monotonic;
auto type_ptr = &type;
if (auto * low_cardinality_type = checkAndGetDataType<DataTypeLowCardinality>(type_ptr))
type_ptr = low_cardinality_type->getDictionaryType().get();
/// `toString` function is monotonous if the argument is Date or DateTime or String, or non-negative numbers with the same number of symbols.
if (checkDataTypes<DataTypeDate, DataTypeDateTime, DataTypeString>(type_ptr))
return positive;
if (left.isNull() || right.isNull())
return {};
if (left.getType() == Field::Types::UInt64
&& right.getType() == Field::Types::UInt64)
{
return (left.get<Int64>() == 0 && right.get<Int64>() == 0)
|| (floor(log10(left.get<UInt64>())) == floor(log10(right.get<UInt64>())))
? positive : not_monotonic;
}
if (left.getType() == Field::Types::Int64
&& right.getType() == Field::Types::Int64)
{
return (left.get<Int64>() == 0 && right.get<Int64>() == 0)
|| (left.get<Int64>() > 0 && right.get<Int64>() > 0 && floor(log10(left.get<Int64>())) == floor(log10(right.get<Int64>())))
? positive : not_monotonic;
}
return not_monotonic;
}
};
struct NameToUInt8 { static constexpr auto name = "toUInt8"; };
struct NameToUInt16 { static constexpr auto name = "toUInt16"; };
struct NameToUInt32 { static constexpr auto name = "toUInt32"; };
struct NameToUInt64 { static constexpr auto name = "toUInt64"; };
struct NameToInt8 { static constexpr auto name = "toInt8"; };
struct NameToInt16 { static constexpr auto name = "toInt16"; };
struct NameToInt32 { static constexpr auto name = "toInt32"; };
struct NameToInt64 { static constexpr auto name = "toInt64"; };
struct NameToFloat32 { static constexpr auto name = "toFloat32"; };
struct NameToFloat64 { static constexpr auto name = "toFloat64"; };
struct NameToUUID { static constexpr auto name = "toUUID"; };
using FunctionToUInt8 = FunctionConvert<DataTypeUInt8, NameToUInt8, ToNumberMonotonicity<UInt8>>;
using FunctionToUInt16 = FunctionConvert<DataTypeUInt16, NameToUInt16, ToNumberMonotonicity<UInt16>>;
using FunctionToUInt32 = FunctionConvert<DataTypeUInt32, NameToUInt32, ToNumberMonotonicity<UInt32>>;
using FunctionToUInt64 = FunctionConvert<DataTypeUInt64, NameToUInt64, ToNumberMonotonicity<UInt64>>;
using FunctionToInt8 = FunctionConvert<DataTypeInt8, NameToInt8, ToNumberMonotonicity<Int8>>;
using FunctionToInt16 = FunctionConvert<DataTypeInt16, NameToInt16, ToNumberMonotonicity<Int16>>;
using FunctionToInt32 = FunctionConvert<DataTypeInt32, NameToInt32, ToNumberMonotonicity<Int32>>;
using FunctionToInt64 = FunctionConvert<DataTypeInt64, NameToInt64, ToNumberMonotonicity<Int64>>;
using FunctionToFloat32 = FunctionConvert<DataTypeFloat32, NameToFloat32, ToNumberMonotonicity<Float32>>;
using FunctionToFloat64 = FunctionConvert<DataTypeFloat64, NameToFloat64, ToNumberMonotonicity<Float64>>;
using FunctionToDate = FunctionConvert<DataTypeDate, NameToDate, ToDateMonotonicity>;
using FunctionToDateTime = FunctionConvert<DataTypeDateTime, NameToDateTime, ToDateTimeMonotonicity>;
using FunctionToDateTime64 = FunctionConvert<DataTypeDateTime64, NameToDateTime64, UnknownMonotonicity>;
using FunctionToUUID = FunctionConvert<DataTypeUUID, NameToUUID, ToNumberMonotonicity<UInt128>>;
using FunctionToString = FunctionConvert<DataTypeString, NameToString, ToStringMonotonicity>;
using FunctionToUnixTimestamp = FunctionConvert<DataTypeUInt32, NameToUnixTimestamp, ToNumberMonotonicity<UInt32>>;
using FunctionToDecimal32 = FunctionConvert<DataTypeDecimal<Decimal32>, NameToDecimal32, UnknownMonotonicity>;
using FunctionToDecimal64 = FunctionConvert<DataTypeDecimal<Decimal64>, NameToDecimal64, UnknownMonotonicity>;
using FunctionToDecimal128 = FunctionConvert<DataTypeDecimal<Decimal128>, NameToDecimal128, UnknownMonotonicity>;
template <typename DataType> struct FunctionTo;
template <> struct FunctionTo<DataTypeUInt8> { using Type = FunctionToUInt8; };
template <> struct FunctionTo<DataTypeUInt16> { using Type = FunctionToUInt16; };
template <> struct FunctionTo<DataTypeUInt32> { using Type = FunctionToUInt32; };
template <> struct FunctionTo<DataTypeUInt64> { using Type = FunctionToUInt64; };
template <> struct FunctionTo<DataTypeInt8> { using Type = FunctionToInt8; };
template <> struct FunctionTo<DataTypeInt16> { using Type = FunctionToInt16; };
template <> struct FunctionTo<DataTypeInt32> { using Type = FunctionToInt32; };
template <> struct FunctionTo<DataTypeInt64> { using Type = FunctionToInt64; };
template <> struct FunctionTo<DataTypeFloat32> { using Type = FunctionToFloat32; };
template <> struct FunctionTo<DataTypeFloat64> { using Type = FunctionToFloat64; };
template <> struct FunctionTo<DataTypeDate> { using Type = FunctionToDate; };
template <> struct FunctionTo<DataTypeDateTime> { using Type = FunctionToDateTime; };
template <> struct FunctionTo<DataTypeDateTime64> { using Type = FunctionToDateTime64; };
template <> struct FunctionTo<DataTypeUUID> { using Type = FunctionToUUID; };
template <> struct FunctionTo<DataTypeString> { using Type = FunctionToString; };
template <> struct FunctionTo<DataTypeFixedString> { using Type = FunctionToFixedString; };
template <> struct FunctionTo<DataTypeDecimal<Decimal32>> { using Type = FunctionToDecimal32; };
template <> struct FunctionTo<DataTypeDecimal<Decimal64>> { using Type = FunctionToDecimal64; };
template <> struct FunctionTo<DataTypeDecimal<Decimal128>> { using Type = FunctionToDecimal128; };
template <typename FieldType> struct FunctionTo<DataTypeEnum<FieldType>>
: FunctionTo<DataTypeNumber<FieldType>>
{
};
struct NameToUInt8OrZero { static constexpr auto name = "toUInt8OrZero"; };
struct NameToUInt16OrZero { static constexpr auto name = "toUInt16OrZero"; };
struct NameToUInt32OrZero { static constexpr auto name = "toUInt32OrZero"; };
struct NameToUInt64OrZero { static constexpr auto name = "toUInt64OrZero"; };
struct NameToInt8OrZero { static constexpr auto name = "toInt8OrZero"; };
struct NameToInt16OrZero { static constexpr auto name = "toInt16OrZero"; };
struct NameToInt32OrZero { static constexpr auto name = "toInt32OrZero"; };
struct NameToInt64OrZero { static constexpr auto name = "toInt64OrZero"; };
struct NameToFloat32OrZero { static constexpr auto name = "toFloat32OrZero"; };
struct NameToFloat64OrZero { static constexpr auto name = "toFloat64OrZero"; };
struct NameToDateOrZero { static constexpr auto name = "toDateOrZero"; };
struct NameToDateTimeOrZero { static constexpr auto name = "toDateTimeOrZero"; };
struct NameToDateTime64OrZero { static constexpr auto name = "toDateTime64OrZero"; };
struct NameToDecimal32OrZero { static constexpr auto name = "toDecimal32OrZero"; };
struct NameToDecimal64OrZero { static constexpr auto name = "toDecimal64OrZero"; };
struct NameToDecimal128OrZero { static constexpr auto name = "toDecimal128OrZero"; };
using FunctionToUInt8OrZero = FunctionConvertFromString<DataTypeUInt8, NameToUInt8OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToUInt16OrZero = FunctionConvertFromString<DataTypeUInt16, NameToUInt16OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToUInt32OrZero = FunctionConvertFromString<DataTypeUInt32, NameToUInt32OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToUInt64OrZero = FunctionConvertFromString<DataTypeUInt64, NameToUInt64OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToInt8OrZero = FunctionConvertFromString<DataTypeInt8, NameToInt8OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToInt16OrZero = FunctionConvertFromString<DataTypeInt16, NameToInt16OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToInt32OrZero = FunctionConvertFromString<DataTypeInt32, NameToInt32OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToInt64OrZero = FunctionConvertFromString<DataTypeInt64, NameToInt64OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToFloat32OrZero = FunctionConvertFromString<DataTypeFloat32, NameToFloat32OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToFloat64OrZero = FunctionConvertFromString<DataTypeFloat64, NameToFloat64OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToDateOrZero = FunctionConvertFromString<DataTypeDate, NameToDateOrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToDateTimeOrZero = FunctionConvertFromString<DataTypeDateTime, NameToDateTimeOrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToDateTime64OrZero = FunctionConvertFromString<DataTypeDateTime64, NameToDateTime64OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToDecimal32OrZero = FunctionConvertFromString<DataTypeDecimal<Decimal32>, NameToDecimal32OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToDecimal64OrZero = FunctionConvertFromString<DataTypeDecimal<Decimal64>, NameToDecimal64OrZero, ConvertFromStringExceptionMode::Zero>;
using FunctionToDecimal128OrZero = FunctionConvertFromString<DataTypeDecimal<Decimal128>, NameToDecimal128OrZero, ConvertFromStringExceptionMode::Zero>;
struct NameToUInt8OrNull { static constexpr auto name = "toUInt8OrNull"; };
struct NameToUInt16OrNull { static constexpr auto name = "toUInt16OrNull"; };
struct NameToUInt32OrNull { static constexpr auto name = "toUInt32OrNull"; };
struct NameToUInt64OrNull { static constexpr auto name = "toUInt64OrNull"; };
struct NameToInt8OrNull { static constexpr auto name = "toInt8OrNull"; };
struct NameToInt16OrNull { static constexpr auto name = "toInt16OrNull"; };
struct NameToInt32OrNull { static constexpr auto name = "toInt32OrNull"; };
struct NameToInt64OrNull { static constexpr auto name = "toInt64OrNull"; };
struct NameToFloat32OrNull { static constexpr auto name = "toFloat32OrNull"; };
struct NameToFloat64OrNull { static constexpr auto name = "toFloat64OrNull"; };
struct NameToDateOrNull { static constexpr auto name = "toDateOrNull"; };
struct NameToDateTimeOrNull { static constexpr auto name = "toDateTimeOrNull"; };
struct NameToDateTime64OrNull { static constexpr auto name = "toDateTime64OrNull"; };
struct NameToDecimal32OrNull { static constexpr auto name = "toDecimal32OrNull"; };
struct NameToDecimal64OrNull { static constexpr auto name = "toDecimal64OrNull"; };
struct NameToDecimal128OrNull { static constexpr auto name = "toDecimal128OrNull"; };
using FunctionToUInt8OrNull = FunctionConvertFromString<DataTypeUInt8, NameToUInt8OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToUInt16OrNull = FunctionConvertFromString<DataTypeUInt16, NameToUInt16OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToUInt32OrNull = FunctionConvertFromString<DataTypeUInt32, NameToUInt32OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToUInt64OrNull = FunctionConvertFromString<DataTypeUInt64, NameToUInt64OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToInt8OrNull = FunctionConvertFromString<DataTypeInt8, NameToInt8OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToInt16OrNull = FunctionConvertFromString<DataTypeInt16, NameToInt16OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToInt32OrNull = FunctionConvertFromString<DataTypeInt32, NameToInt32OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToInt64OrNull = FunctionConvertFromString<DataTypeInt64, NameToInt64OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToFloat32OrNull = FunctionConvertFromString<DataTypeFloat32, NameToFloat32OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToFloat64OrNull = FunctionConvertFromString<DataTypeFloat64, NameToFloat64OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToDateOrNull = FunctionConvertFromString<DataTypeDate, NameToDateOrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToDateTimeOrNull = FunctionConvertFromString<DataTypeDateTime, NameToDateTimeOrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToDateTime64OrNull = FunctionConvertFromString<DataTypeDateTime64, NameToDateTime64OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToDecimal32OrNull = FunctionConvertFromString<DataTypeDecimal<Decimal32>, NameToDecimal32OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToDecimal64OrNull = FunctionConvertFromString<DataTypeDecimal<Decimal64>, NameToDecimal64OrNull, ConvertFromStringExceptionMode::Null>;
using FunctionToDecimal128OrNull = FunctionConvertFromString<DataTypeDecimal<Decimal128>, NameToDecimal128OrNull, ConvertFromStringExceptionMode::Null>;
struct NameParseDateTimeBestEffort { static constexpr auto name = "parseDateTimeBestEffort"; };
struct NameParseDateTimeBestEffortUS { static constexpr auto name = "parseDateTimeBestEffortUS"; };
struct NameParseDateTimeBestEffortOrZero { static constexpr auto name = "parseDateTimeBestEffortOrZero"; };
struct NameParseDateTimeBestEffortOrNull { static constexpr auto name = "parseDateTimeBestEffortOrNull"; };
struct NameParseDateTime64BestEffort { static constexpr auto name = "parseDateTime64BestEffort"; };
struct NameParseDateTime64BestEffortOrZero { static constexpr auto name = "parseDateTime64BestEffortOrZero"; };
struct NameParseDateTime64BestEffortOrNull { static constexpr auto name = "parseDateTime64BestEffortOrNull"; };
using FunctionParseDateTimeBestEffort = FunctionConvertFromString<
DataTypeDateTime, NameParseDateTimeBestEffort, ConvertFromStringExceptionMode::Throw, ConvertFromStringParsingMode::BestEffort>;
using FunctionParseDateTimeBestEffortUS = FunctionConvertFromString<
DataTypeDateTime, NameParseDateTimeBestEffortUS, ConvertFromStringExceptionMode::Throw, ConvertFromStringParsingMode::BestEffortUS>;
using FunctionParseDateTimeBestEffortOrZero = FunctionConvertFromString<
DataTypeDateTime, NameParseDateTimeBestEffortOrZero, ConvertFromStringExceptionMode::Zero, ConvertFromStringParsingMode::BestEffort>;
using FunctionParseDateTimeBestEffortOrNull = FunctionConvertFromString<
DataTypeDateTime, NameParseDateTimeBestEffortOrNull, ConvertFromStringExceptionMode::Null, ConvertFromStringParsingMode::BestEffort>;
using FunctionParseDateTime64BestEffort = FunctionConvertFromString<
DataTypeDateTime64, NameParseDateTime64BestEffort, ConvertFromStringExceptionMode::Throw, ConvertFromStringParsingMode::BestEffort>;
using FunctionParseDateTime64BestEffortOrZero = FunctionConvertFromString<
DataTypeDateTime64, NameParseDateTime64BestEffortOrZero, ConvertFromStringExceptionMode::Zero, ConvertFromStringParsingMode::BestEffort>;
using FunctionParseDateTime64BestEffortOrNull = FunctionConvertFromString<
DataTypeDateTime64, NameParseDateTime64BestEffortOrNull, ConvertFromStringExceptionMode::Null, ConvertFromStringParsingMode::BestEffort>;
class ExecutableFunctionCast : public IExecutableFunctionImpl
{
public:
using WrapperType = std::function<void(Block &, const ColumnNumbers &, size_t, size_t)>;
explicit ExecutableFunctionCast(WrapperType && wrapper_function_, const char * name_)
: wrapper_function(std::move(wrapper_function_)), name(name_) {}
String getName() const override { return name; }
protected:
void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
{
/// drop second argument, pass others
ColumnNumbers new_arguments{arguments.front()};
if (arguments.size() > 2)
new_arguments.insert(std::end(new_arguments), std::next(std::begin(arguments), 2), std::end(arguments));
wrapper_function(block, new_arguments, result, input_rows_count);
}
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForConstants() const override { return true; }
bool useDefaultImplementationForLowCardinalityColumns() const override { return false; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
private:
WrapperType wrapper_function;
const char * name;
};
struct NameCast { static constexpr auto name = "CAST"; };
class FunctionCast final : public IFunctionBaseImpl
{
public:
using WrapperType = std::function<void(Block &, const ColumnNumbers &, size_t, size_t)>;
using MonotonicityForRange = std::function<Monotonicity(const IDataType &, const Field &, const Field &)>;
FunctionCast(const char * name_, MonotonicityForRange && monotonicity_for_range_
, const DataTypes & argument_types_, const DataTypePtr & return_type_)
: name(name_), monotonicity_for_range(monotonicity_for_range_)
, argument_types(argument_types_), return_type(return_type_)
{
}
const DataTypes & getArgumentTypes() const override { return argument_types; }
const DataTypePtr & getReturnType() const override { return return_type; }
ExecutableFunctionImplPtr prepare(const Block & /*sample_block*/, const ColumnNumbers & /*arguments*/, size_t /*result*/) const override
{
return std::make_unique<ExecutableFunctionCast>(
prepareUnpackDictionaries(getArgumentTypes()[0], getReturnType()), name);
}
String getName() const override { return name; }
bool isDeterministic() const override { return true; }
bool isDeterministicInScopeOfQuery() const override { return true; }
bool hasInformationAboutMonotonicity() const override
{
return static_cast<bool>(monotonicity_for_range);
}
Monotonicity getMonotonicityForRange(const IDataType & type, const Field & left, const Field & right) const override
{
return monotonicity_for_range(type, left, right);
}
private:
const char * name;
MonotonicityForRange monotonicity_for_range;
DataTypes argument_types;
DataTypePtr return_type;
template <typename DataType>
WrapperType createWrapper(const DataTypePtr & from_type, const DataType * const, bool requested_result_is_nullable) const
{
FunctionPtr function;
if (requested_result_is_nullable && checkAndGetDataType<DataTypeString>(from_type.get()))
{
/// In case when converting to Nullable type, we apply different parsing rule,
/// that will not throw an exception but return NULL in case of malformed input.
function = FunctionConvertFromString<DataType, NameCast, ConvertFromStringExceptionMode::Null>::create();
}
else
function = FunctionTo<DataType>::Type::create();
auto function_adaptor =
FunctionOverloadResolverAdaptor(std::make_unique<DefaultOverloadResolver>(function))
.build({ColumnWithTypeAndName{nullptr, from_type, ""}});
return [function_adaptor] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
function_adaptor->execute(block, arguments, result, input_rows_count);
};
}
WrapperType createStringWrapper(const DataTypePtr & from_type) const
{
FunctionPtr function = FunctionToString::create();
auto function_adaptor =
FunctionOverloadResolverAdaptor(std::make_unique<DefaultOverloadResolver>(function))
.build({ColumnWithTypeAndName{nullptr, from_type, ""}});
return [function_adaptor] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
function_adaptor->execute(block, arguments, result, input_rows_count);
};
}
static WrapperType createFixedStringWrapper(const DataTypePtr & from_type, const size_t N)
{
if (!isStringOrFixedString(from_type))
throw Exception{"CAST AS FixedString is only implemented for types String and FixedString", ErrorCodes::NOT_IMPLEMENTED};
return [N] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t /*input_rows_count*/)
{
FunctionToFixedString::executeForN(block, arguments, result, N);
};
}
WrapperType createUUIDWrapper(const DataTypePtr & from_type, const DataTypeUUID * const, bool requested_result_is_nullable) const
{
if (requested_result_is_nullable)
throw Exception{"CAST AS Nullable(UUID) is not implemented", ErrorCodes::NOT_IMPLEMENTED};
FunctionPtr function = FunctionTo<DataTypeUUID>::Type::create();
auto function_adaptor =
FunctionOverloadResolverAdaptor(std::make_unique<DefaultOverloadResolver>(function))
.build({ColumnWithTypeAndName{nullptr, from_type, ""}});
return [function_adaptor] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
function_adaptor->execute(block, arguments, result, input_rows_count);
};
}
template <typename ToDataType>
std::enable_if_t<IsDataTypeDecimal<ToDataType>, WrapperType>
createDecimalWrapper(const DataTypePtr & from_type, const ToDataType * to_type) const
{
TypeIndex type_index = from_type->getTypeId();
UInt32 scale = to_type->getScale();
WhichDataType which(type_index);
bool ok = which.isNativeInt() ||
which.isNativeUInt() ||
which.isDecimal() ||
which.isFloat() ||
which.isDateOrDateTime() ||
which.isStringOrFixedString();
if (!ok)
throw Exception{"Conversion from " + from_type->getName() + " to " + to_type->getName() + " is not supported",
ErrorCodes::CANNOT_CONVERT_TYPE};
return [type_index, scale, to_type] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
auto res = callOnIndexAndDataType<ToDataType>(type_index, [&](const auto & types) -> bool
{
using Types = std::decay_t<decltype(types)>;
using LeftDataType = typename Types::LeftType;
using RightDataType = typename Types::RightType;
ConvertImpl<LeftDataType, RightDataType, NameCast>::execute(block, arguments, result, input_rows_count, scale);
return true;
});
/// Additionally check if callOnIndexAndDataType wasn't called at all.
if (!res)
{
throw Exception{"Conversion from " + std::string(getTypeName(type_index)) + " to " + to_type->getName() +
" is not supported", ErrorCodes::CANNOT_CONVERT_TYPE};
}
};
}
WrapperType createAggregateFunctionWrapper(const DataTypePtr & from_type_untyped, const DataTypeAggregateFunction * to_type) const
{
/// Conversion from String through parsing.
if (checkAndGetDataType<DataTypeString>(from_type_untyped.get()))
{
return [] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t /*input_rows_count*/)
{
ConvertImplGenericFromString::execute(block, arguments, result);
};
}
else
throw Exception{"Conversion from " + from_type_untyped->getName() + " to " + to_type->getName() +
" is not supported", ErrorCodes::CANNOT_CONVERT_TYPE};
}
WrapperType createArrayWrapper(const DataTypePtr & from_type_untyped, const DataTypeArray * to_type) const
{
/// Conversion from String through parsing.
if (checkAndGetDataType<DataTypeString>(from_type_untyped.get()))
{
return [] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t /*input_rows_count*/)
{
ConvertImplGenericFromString::execute(block, arguments, result);
};
}
DataTypePtr from_nested_type;
DataTypePtr to_nested_type;
auto from_type = checkAndGetDataType<DataTypeArray>(from_type_untyped.get());
/// get the most nested type
if (from_type && to_type)
{
from_nested_type = from_type->getNestedType();
to_nested_type = to_type->getNestedType();
from_type = checkAndGetDataType<DataTypeArray>(from_nested_type.get());
to_type = checkAndGetDataType<DataTypeArray>(to_nested_type.get());
}
/// both from_type and to_type should be nullptr now is array types had same dimensions
if ((from_type == nullptr) != (to_type == nullptr))
throw Exception{"CAST AS Array can only be performed between same-dimensional array types or from String",
ErrorCodes::TYPE_MISMATCH};
/// Prepare nested type conversion
const auto nested_function = prepareUnpackDictionaries(from_nested_type, to_nested_type);
return [nested_function, from_nested_type, to_nested_type](
Block & block, const ColumnNumbers & arguments, const size_t result, size_t /*input_rows_count*/)
{
const auto & array_arg = block.getByPosition(arguments.front());
if (const ColumnArray * col_array = checkAndGetColumn<ColumnArray>(array_arg.column.get()))
{
/// create block for converting nested column containing original and result columns
Block nested_block
{
{ col_array->getDataPtr(), from_nested_type, "" },
{ nullptr, to_nested_type, "" }
};
/// convert nested column
nested_function(nested_block, {0}, 1, nested_block.rows());
/// set converted nested column to result
block.getByPosition(result).column = ColumnArray::create(nested_block.getByPosition(1).column, col_array->getOffsetsPtr());
}
else
throw Exception{"Illegal column " + array_arg.column->getName() + " for function CAST AS Array", ErrorCodes::LOGICAL_ERROR};
};
}
WrapperType createTupleWrapper(const DataTypePtr & from_type_untyped, const DataTypeTuple * to_type) const
{
/// Conversion from String through parsing.
if (checkAndGetDataType<DataTypeString>(from_type_untyped.get()))
{
return [] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t /*input_rows_count*/)
{
ConvertImplGenericFromString::execute(block, arguments, result);
};
}
const auto from_type = checkAndGetDataType<DataTypeTuple>(from_type_untyped.get());
if (!from_type)
throw Exception{"CAST AS Tuple can only be performed between tuple types or from String.\nLeft type: "
+ from_type_untyped->getName() + ", right type: " + to_type->getName(), ErrorCodes::TYPE_MISMATCH};
if (from_type->getElements().size() != to_type->getElements().size())
throw Exception{"CAST AS Tuple can only be performed between tuple types with the same number of elements or from String.\n"
"Left type: " + from_type->getName() + ", right type: " + to_type->getName(), ErrorCodes::TYPE_MISMATCH};
const auto & from_element_types = from_type->getElements();
const auto & to_element_types = to_type->getElements();
std::vector<WrapperType> element_wrappers;
element_wrappers.reserve(from_element_types.size());
/// Create conversion wrapper for each element in tuple
for (const auto idx_type : ext::enumerate(from_type->getElements()))
element_wrappers.push_back(prepareUnpackDictionaries(idx_type.second, to_element_types[idx_type.first]));
return [element_wrappers, from_element_types, to_element_types]
(Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
const auto col = block.getByPosition(arguments.front()).column.get();
/// copy tuple elements to a separate block
Block element_block;
size_t tuple_size = from_element_types.size();
const ColumnTuple & column_tuple = typeid_cast<const ColumnTuple &>(*col);
/// create columns for source elements
for (size_t i = 0; i < tuple_size; ++i)
element_block.insert({ column_tuple.getColumns()[i], from_element_types[i], "" });
/// create columns for converted elements
for (const auto & to_element_type : to_element_types)
element_block.insert({ nullptr, to_element_type, "" });
/// insert column for converted tuple
element_block.insert({ nullptr, std::make_shared<DataTypeTuple>(to_element_types), "" });
/// invoke conversion for each element
for (const auto idx_element_wrapper : ext::enumerate(element_wrappers))
idx_element_wrapper.second(element_block, { idx_element_wrapper.first },
tuple_size + idx_element_wrapper.first, input_rows_count);
Columns converted_columns(tuple_size);
for (size_t i = 0; i < tuple_size; ++i)
converted_columns[i] = element_block.getByPosition(tuple_size + i).column;
block.getByPosition(result).column = ColumnTuple::create(converted_columns);
};
}
template <typename FieldType>
WrapperType createEnumWrapper(const DataTypePtr & from_type, const DataTypeEnum<FieldType> * to_type, bool source_is_nullable) const
{
using EnumType = DataTypeEnum<FieldType>;
using Function = typename FunctionTo<EnumType>::Type;
if (const auto from_enum8 = checkAndGetDataType<DataTypeEnum8>(from_type.get()))
checkEnumToEnumConversion(from_enum8, to_type);
else if (const auto from_enum16 = checkAndGetDataType<DataTypeEnum16>(from_type.get()))
checkEnumToEnumConversion(from_enum16, to_type);
if (checkAndGetDataType<DataTypeString>(from_type.get()))
return createStringToEnumWrapper<ColumnString, EnumType>(source_is_nullable);
else if (checkAndGetDataType<DataTypeFixedString>(from_type.get()))
return createStringToEnumWrapper<ColumnFixedString, EnumType>(source_is_nullable);
else if (isNativeNumber(from_type) || isEnum(from_type))
{
auto function = Function::create();
auto func_or_adaptor = FunctionOverloadResolverAdaptor(std::make_unique<DefaultOverloadResolver>(function))
.build(ColumnsWithTypeAndName{{nullptr, from_type, "" }});
return [func_or_adaptor] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
func_or_adaptor->execute(block, arguments, result, input_rows_count);
};
}
else
throw Exception{"Conversion from " + from_type->getName() + " to " + to_type->getName() +
" is not supported", ErrorCodes::CANNOT_CONVERT_TYPE};
}
template <typename EnumTypeFrom, typename EnumTypeTo>
void checkEnumToEnumConversion(const EnumTypeFrom * from_type, const EnumTypeTo * to_type) const
{
const auto & from_values = from_type->getValues();
const auto & to_values = to_type->getValues();
using ValueType = std::common_type_t<typename EnumTypeFrom::FieldType, typename EnumTypeTo::FieldType>;
using NameValuePair = std::pair<std::string, ValueType>;
using EnumValues = std::vector<NameValuePair>;
EnumValues name_intersection;
std::set_intersection(std::begin(from_values), std::end(from_values),
std::begin(to_values), std::end(to_values), std::back_inserter(name_intersection),
[] (auto && from, auto && to) { return from.first < to.first; });
for (const auto & name_value : name_intersection)
{
const auto & old_value = name_value.second;
const auto & new_value = to_type->getValue(name_value.first);
if (old_value != new_value)
throw Exception{"Enum conversion changes value for element '" + name_value.first +
"' from " + toString(old_value) + " to " + toString(new_value), ErrorCodes::CANNOT_CONVERT_TYPE};
}
}
template <typename ColumnStringType, typename EnumType>
WrapperType createStringToEnumWrapper(bool source_is_nullable) const
{
const char * function_name = name;
return [function_name, source_is_nullable] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t /*input_rows_count*/)
{
const auto first_col = block.getByPosition(arguments.front()).column.get();
auto & col_with_type_and_name = block.getByPosition(result);
const auto & result_type = typeid_cast<const EnumType &>(*col_with_type_and_name.type);
const ColumnStringType * col = typeid_cast<const ColumnStringType *>(first_col);
const ColumnNullable * nullable_col = nullptr;
if (source_is_nullable)
{
if (block.columns() <= arguments.front() + 1)
throw Exception("Not enough columns", ErrorCodes::LOGICAL_ERROR);
size_t nullable_pos = block.columns() - 1;
nullable_col = typeid_cast<const ColumnNullable *>(block.getByPosition(nullable_pos).column.get());
if (!nullable_col)
throw Exception("Last column should be ColumnNullable", ErrorCodes::LOGICAL_ERROR);
if (col && nullable_col->size() != col->size())
throw Exception("ColumnNullable is not compatible with original", ErrorCodes::LOGICAL_ERROR);
}
if (col)
{
const auto size = col->size();
auto res = result_type.createColumn();
auto & out_data = static_cast<typename EnumType::ColumnType &>(*res).getData();
out_data.resize(size);
if (nullable_col)
{
for (const auto i : ext::range(0, size))
{
if (!nullable_col->isNullAt(i))
out_data[i] = result_type.getValue(col->getDataAt(i));
}
}
else
{
for (const auto i : ext::range(0, size))
out_data[i] = result_type.getValue(col->getDataAt(i));
}
col_with_type_and_name.column = std::move(res);
}
else
throw Exception{"Unexpected column " + first_col->getName() + " as first argument of function " + function_name,
ErrorCodes::LOGICAL_ERROR};
};
}
WrapperType createIdentityWrapper(const DataTypePtr &) const
{
return [] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t /*input_rows_count*/)
{
block.getByPosition(result).column = block.getByPosition(arguments.front()).column;
};
}
WrapperType createNothingWrapper(const IDataType * to_type) const
{
ColumnPtr res = to_type->createColumnConstWithDefaultValue(1);
return [res] (Block & block, const ColumnNumbers &, const size_t result, size_t input_rows_count)
{
/// Column of Nothing type is trivially convertible to any other column
block.getByPosition(result).column = res->cloneResized(input_rows_count)->convertToFullColumnIfConst();
};
}
WrapperType prepareUnpackDictionaries(const DataTypePtr & from_type, const DataTypePtr & to_type) const
{
const auto * from_low_cardinality = typeid_cast<const DataTypeLowCardinality *>(from_type.get());
const auto * to_low_cardinality = typeid_cast<const DataTypeLowCardinality *>(to_type.get());
const auto & from_nested = from_low_cardinality ? from_low_cardinality->getDictionaryType() : from_type;
const auto & to_nested = to_low_cardinality ? to_low_cardinality->getDictionaryType() : to_type;
if (from_type->onlyNull())
{
if (!to_nested->isNullable())
throw Exception{"Cannot convert NULL to a non-nullable type", ErrorCodes::CANNOT_CONVERT_TYPE};
return [](Block & block, const ColumnNumbers &, const size_t result, size_t input_rows_count)
{
auto & res = block.getByPosition(result);
res.column = res.type->createColumnConstWithDefaultValue(input_rows_count)->convertToFullColumnIfConst();
};
}
bool skip_not_null_check = false;
if (from_low_cardinality && from_nested->isNullable() && !to_nested->isNullable())
/// Disable check for dictionary. Will check that column doesn't contain NULL in wrapper below.
skip_not_null_check = true;
auto wrapper = prepareRemoveNullable(from_nested, to_nested, skip_not_null_check);
if (!from_low_cardinality && !to_low_cardinality)
return wrapper;
return [wrapper, from_low_cardinality, to_low_cardinality, skip_not_null_check]
(Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
auto & arg = block.getByPosition(arguments[0]);
auto & res = block.getByPosition(result);
ColumnPtr res_indexes;
/// For some types default can't be casted (for example, String to Int). In that case convert column to full.
bool src_converted_to_full_column = false;
{
/// Replace argument and result columns (and types) to dictionary key columns (and types).
/// Call nested wrapper in order to cast dictionary keys. Then restore block.
auto prev_arg_col = arg.column;
auto prev_arg_type = arg.type;
auto prev_res_type = res.type;
auto tmp_rows_count = input_rows_count;
if (to_low_cardinality)
res.type = to_low_cardinality->getDictionaryType();
if (from_low_cardinality)
{
auto * col_low_cardinality = typeid_cast<const ColumnLowCardinality *>(prev_arg_col.get());
if (skip_not_null_check && col_low_cardinality->containsNull())
throw Exception{"Cannot convert NULL value to non-Nullable type",
ErrorCodes::CANNOT_INSERT_NULL_IN_ORDINARY_COLUMN};
arg.column = col_low_cardinality->getDictionary().getNestedColumn();
arg.type = from_low_cardinality->getDictionaryType();
/// TODO: Make map with defaults conversion.
src_converted_to_full_column = !removeNullable(arg.type)->equals(*removeNullable(res.type));
if (src_converted_to_full_column)
arg.column = arg.column->index(col_low_cardinality->getIndexes(), 0);
else
res_indexes = col_low_cardinality->getIndexesPtr();
tmp_rows_count = arg.column->size();
}
/// Perform the requested conversion.
wrapper(block, arguments, result, tmp_rows_count);
arg.column = prev_arg_col;
arg.type = prev_arg_type;
res.type = prev_res_type;
}
if (to_low_cardinality)
{
auto res_column = to_low_cardinality->createColumn();
auto * col_low_cardinality = typeid_cast<ColumnLowCardinality *>(res_column.get());
if (from_low_cardinality && !src_converted_to_full_column)
{
auto res_keys = std::move(res.column);
col_low_cardinality->insertRangeFromDictionaryEncodedColumn(*res_keys, *res_indexes);
}
else
col_low_cardinality->insertRangeFromFullColumn(*res.column, 0, res.column->size());
res.column = std::move(res_column);
}
else if (!src_converted_to_full_column)
res.column = res.column->index(*res_indexes, 0);
};
}
WrapperType prepareRemoveNullable(const DataTypePtr & from_type, const DataTypePtr & to_type, bool skip_not_null_check) const
{
/// Determine whether pre-processing and/or post-processing must take place during conversion.
bool source_is_nullable = from_type->isNullable();
bool result_is_nullable = to_type->isNullable();
auto wrapper = prepareImpl(removeNullable(from_type), removeNullable(to_type), result_is_nullable, source_is_nullable);
if (result_is_nullable)
{
return [wrapper, source_is_nullable]
(Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
/// Create a temporary block on which to perform the operation.
auto & res = block.getByPosition(result);
const auto & ret_type = res.type;
const auto & nullable_type = static_cast<const DataTypeNullable &>(*ret_type);
const auto & nested_type = nullable_type.getNestedType();
Block tmp_block;
if (source_is_nullable)
tmp_block = createBlockWithNestedColumns(block, arguments);
else
tmp_block = block;
size_t tmp_res_index = block.columns();
tmp_block.insert({nullptr, nested_type, ""});
/// Add original ColumnNullable for createStringToEnumWrapper()
if (source_is_nullable)
{
if (arguments.size() != 1)
throw Exception("Invalid number of arguments", ErrorCodes::LOGICAL_ERROR);
tmp_block.insert(block.getByPosition(arguments.front()));
}
/// Perform the requested conversion.
wrapper(tmp_block, arguments, tmp_res_index, input_rows_count);
const auto & tmp_res = tmp_block.getByPosition(tmp_res_index);
/// May happen in fuzzy tests. For debug purpose.
if (!tmp_res.column)
throw Exception("Couldn't convert " + block.getByPosition(arguments[0]).type->getName() + " to "
+ nested_type->getName() + " in " + " prepareRemoveNullable wrapper.", ErrorCodes::LOGICAL_ERROR);
res.column = wrapInNullable(tmp_res.column, Block({block.getByPosition(arguments[0]), tmp_res}), {0}, 1, input_rows_count);
};
}
else if (source_is_nullable)
{
/// Conversion from Nullable to non-Nullable.
return [wrapper, skip_not_null_check] (Block & block, const ColumnNumbers & arguments, const size_t result, size_t input_rows_count)
{
Block tmp_block = createBlockWithNestedColumns(block, arguments, result);
/// Check that all values are not-NULL.
/// Check can be skipped in case if LowCardinality dictionary is transformed.
/// In that case, correctness will be checked beforehand.
if (!skip_not_null_check)
{
const auto & col = block.getByPosition(arguments[0]).column;
const auto & nullable_col = assert_cast<const ColumnNullable &>(*col);
const auto & null_map = nullable_col.getNullMapData();
if (!memoryIsZero(null_map.data(), null_map.size()))
throw Exception{"Cannot convert NULL value to non-Nullable type",
ErrorCodes::CANNOT_INSERT_NULL_IN_ORDINARY_COLUMN};
}
wrapper(tmp_block, arguments, result, input_rows_count);
block.getByPosition(result).column = tmp_block.getByPosition(result).column;
};
}
else
return wrapper;
}
/// 'from_type' and 'to_type' are nested types in case of Nullable.
/// 'requested_result_is_nullable' is true if CAST to Nullable type is requested.
WrapperType prepareImpl(const DataTypePtr & from_type, const DataTypePtr & to_type, bool requested_result_is_nullable, bool source_is_nullable) const
{
if (from_type->equals(*to_type))
return createIdentityWrapper(from_type);
else if (WhichDataType(from_type).isNothing())
return createNothingWrapper(to_type.get());
WrapperType ret;
auto make_default_wrapper = [&](const auto & types) -> bool
{
using Types = std::decay_t<decltype(types)>;
using ToDataType = typename Types::LeftType;
if constexpr (
std::is_same_v<ToDataType, DataTypeUInt8> ||
std::is_same_v<ToDataType, DataTypeUInt16> ||
std::is_same_v<ToDataType, DataTypeUInt32> ||
std::is_same_v<ToDataType, DataTypeUInt64> ||
std::is_same_v<ToDataType, DataTypeInt8> ||
std::is_same_v<ToDataType, DataTypeInt16> ||
std::is_same_v<ToDataType, DataTypeInt32> ||
std::is_same_v<ToDataType, DataTypeInt64> ||
std::is_same_v<ToDataType, DataTypeFloat32> ||
std::is_same_v<ToDataType, DataTypeFloat64> ||
std::is_same_v<ToDataType, DataTypeDate> ||
std::is_same_v<ToDataType, DataTypeDateTime>)
{
ret = createWrapper(from_type, checkAndGetDataType<ToDataType>(to_type.get()), requested_result_is_nullable);
return true;
}
if constexpr (
std::is_same_v<ToDataType, DataTypeEnum8> ||
std::is_same_v<ToDataType, DataTypeEnum16>)
{
ret = createEnumWrapper(from_type, checkAndGetDataType<ToDataType>(to_type.get()), source_is_nullable);
return true;
}
if constexpr (
std::is_same_v<ToDataType, DataTypeDecimal<Decimal32>> ||
std::is_same_v<ToDataType, DataTypeDecimal<Decimal64>> ||
std::is_same_v<ToDataType, DataTypeDecimal<Decimal128>> ||
std::is_same_v<ToDataType, DataTypeDateTime64>)
{
ret = createDecimalWrapper(from_type, checkAndGetDataType<ToDataType>(to_type.get()));
return true;
}
if constexpr (std::is_same_v<ToDataType, DataTypeUUID>)
{
if (isStringOrFixedString(from_type))
{
ret = createUUIDWrapper(from_type, checkAndGetDataType<ToDataType>(to_type.get()), requested_result_is_nullable);
return true;
}
}
return false;
};
if (callOnIndexAndDataType<void>(to_type->getTypeId(), make_default_wrapper))
return ret;
switch (to_type->getTypeId())
{
case TypeIndex::String:
return createStringWrapper(from_type);
case TypeIndex::FixedString:
return createFixedStringWrapper(from_type, checkAndGetDataType<DataTypeFixedString>(to_type.get())->getN());
case TypeIndex::Array:
return createArrayWrapper(from_type, checkAndGetDataType<DataTypeArray>(to_type.get()));
case TypeIndex::Tuple:
return createTupleWrapper(from_type, checkAndGetDataType<DataTypeTuple>(to_type.get()));
case TypeIndex::AggregateFunction:
return createAggregateFunctionWrapper(from_type, checkAndGetDataType<DataTypeAggregateFunction>(to_type.get()));
default:
break;
}
throw Exception{"Conversion from " + from_type->getName() + " to " + to_type->getName() + " is not supported",
ErrorCodes::CANNOT_CONVERT_TYPE};
}
};
class CastOverloadResolver : public IFunctionOverloadResolverImpl
{
public:
using MonotonicityForRange = FunctionCast::MonotonicityForRange;
static constexpr auto name = "CAST";
static FunctionOverloadResolverImplPtr create(const Context & context);
static FunctionOverloadResolverImplPtr createImpl(bool keep_nullable) { return std::make_unique<CastOverloadResolver>(keep_nullable); }
CastOverloadResolver(bool keep_nullable_)
: keep_nullable(keep_nullable_)
{}
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 2; }
ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
protected:
FunctionBaseImplPtr build(const ColumnsWithTypeAndName & arguments, const DataTypePtr & return_type) const override
{
DataTypes data_types(arguments.size());
for (size_t i = 0; i < arguments.size(); ++i)
data_types[i] = arguments[i].type;
auto monotonicity = getMonotonicityInformation(arguments.front().type, return_type.get());
return std::make_unique<FunctionCast>(name, std::move(monotonicity), data_types, return_type);
}
DataTypePtr getReturnType(const ColumnsWithTypeAndName & arguments) const override
{
const auto & column = arguments.back().column;
if (!column)
throw Exception("Second argument to " + getName() + " must be a constant string describing type."
" Instead there is non-constant column of type " + arguments.back().type->getName(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
const auto type_col = checkAndGetColumnConst<ColumnString>(column.get());
if (!type_col)
throw Exception("Second argument to " + getName() + " must be a constant string describing type."
" Instead there is a column with the following structure: " + column->dumpStructure(),
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
DataTypePtr type = DataTypeFactory::instance().get(type_col->getValue<String>());
if (keep_nullable && arguments.front().type->isNullable())
return makeNullable(type);
return type;
}
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForLowCardinalityColumns() const override { return false; }
private:
bool keep_nullable;
template <typename DataType>
static auto monotonicityForType(const DataType * const)
{
return FunctionTo<DataType>::Type::Monotonic::get;
}
MonotonicityForRange getMonotonicityInformation(const DataTypePtr & from_type, const IDataType * to_type) const
{
if (const auto type = checkAndGetDataType<DataTypeUInt8>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeUInt16>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeUInt32>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeUInt64>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeInt8>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeInt16>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeInt32>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeInt64>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeFloat32>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeFloat64>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeDate>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeDateTime>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeString>(to_type))
return monotonicityForType(type);
if (isEnum(from_type))
{
if (const auto type = checkAndGetDataType<DataTypeEnum8>(to_type))
return monotonicityForType(type);
if (const auto type = checkAndGetDataType<DataTypeEnum16>(to_type))
return monotonicityForType(type);
}
/// other types like Null, FixedString, Array and Tuple have no monotonicity defined
return {};
}
};
}
Reference in New Issue View Git Blame Copy Permalink