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FunctionsConversion.h
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FunctionsConversion.h
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// Copyright 2023 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <Columns/ColumnArray.h>
#include <Columns/ColumnConst.h>
#include <Columns/ColumnFixedString.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnTuple.h>
#include <Columns/ColumnsCommon.h>
#include <Common/FieldVisitors.h>
#include <Common/MyTime.h>
#include <DataTypes/DataTypeArray.h>
#include <DataTypes/DataTypeDate.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeEnum.h>
#include <DataTypes/DataTypeFactory.h>
#include <DataTypes/DataTypeFixedString.h>
#include <DataTypes/DataTypeInterval.h>
#include <DataTypes/DataTypeMyDate.h>
#include <DataTypes/DataTypeMyDateTime.h>
#include <DataTypes/DataTypeNothing.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypeTuple.h>
#include <DataTypes/DataTypeUUID.h>
#include <DataTypes/DataTypesNumber.h>
#include <Functions/FunctionFactory.h>
#include <Functions/FunctionHelpers.h>
#include <Functions/FunctionsDateTime.h>
#include <Functions/FunctionsMiscellaneous.h>
#include <Functions/IFunction.h>
#include <IO/Buffer/ReadBufferFromMemory.h>
#include <IO/Buffer/WriteBufferFromVector.h>
#include <IO/Operators.h>
#include <IO/parseDateTimeBestEffort.h>
#include <Interpreters/Context.h>
#include <Interpreters/ExpressionActions.h>
#include <ext/collection_cast.h>
#include <ext/enumerate.h>
#include <ext/range.h>
#include <type_traits>
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_LARGE_STRING_SIZE;
extern const int TOO_LESS_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;
} // namespace ErrorCodes
/** Type conversion functions.
* toType - conversion in "natural way";
*/
/** 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;
static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
{
if (const ColumnVector<FromFieldType> * col_from
= checkAndGetColumn<ColumnVector<FromFieldType>>(block.getByPosition(arguments[0]).column.get()))
{
auto col_to = ColumnVector<ToFieldType>::create();
const typename ColumnVector<FromFieldType>::Container & vec_from = col_from->getData();
typename ColumnVector<ToFieldType>::Container & vec_to = col_to->getData();
size_t size = vec_from.size();
vec_to.resize(size);
for (size_t i = 0; i < size; ++i)
vec_to[i] = static_cast<ToFieldType>(vec_from[i]);
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);
}
};
template <typename DecimalDataType, typename ToDataType, typename Name>
struct ConvertFromDecimal
{
using DecimalFieldType = typename DecimalDataType::FieldType;
using ToFieldType = typename ToDataType::FieldType;
static void execute(
Block & block [[maybe_unused]],
const ColumnNumbers & arguments [[maybe_unused]],
size_t result [[maybe_unused]])
{
if constexpr (std::is_integral_v<ToFieldType> || std::is_floating_point_v<ToFieldType>)
{
const auto * col_from
= checkAndGetColumn<ColumnDecimal<DecimalFieldType>>(block.getByPosition(arguments[0]).column.get());
auto col_to = ColumnVector<ToFieldType>::create();
typename ColumnVector<ToFieldType>::Container & vec_to = col_to->getData();
size_t size = col_from->size();
vec_to.resize(size);
for (size_t i = 0; i < size; ++i)
{
auto field = (*col_from)[i].template safeGet<DecimalField<DecimalFieldType>>();
vec_to[i] = static_cast<ToFieldType>(field);
}
block.getByPosition(result).column = std::move(col_to);
}
else if constexpr (std::is_same_v<String, ToFieldType>)
{
const auto * col_from
= checkAndGetColumn<ColumnDecimal<DecimalFieldType>>(block.getByPosition(arguments[0]).column.get());
auto col_to = ColumnString::create();
const typename ColumnDecimal<DecimalFieldType>::Container & vec_from = col_from->getData();
ColumnString::Chars_t & data_to = col_to->getChars();
ColumnString::Offsets & offsets_to = col_to->getOffsets();
size_t size = vec_from.size();
data_to.resize(size * decimal_max_prec + size);
offsets_to.resize(size);
WriteBufferFromVector<ColumnString::Chars_t> write_buffer(data_to);
for (size_t i = 0; i < size; ++i)
{
writeText(vec_from[i], vec_from.getScale(), write_buffer);
writeChar(0, write_buffer);
offsets_to[i] = write_buffer.count();
}
data_to.resize(write_buffer.count());
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);
}
};
template <typename FromDataType, typename Name, typename ToFieldType>
struct ConvertToDecimalImpl
{
using FromFieldType = typename FromDataType::FieldType;
static void execute(
Block & block,
const ColumnNumbers & arguments,
size_t result,
PrecType prec [[maybe_unused]],
ScaleType scale)
{
if constexpr (IsDecimal<FromFieldType>)
{
const auto * col_from
= checkAndGetColumn<ColumnDecimal<FromFieldType>>(block.getByPosition(arguments[0]).column.get());
auto col_to = ColumnDecimal<ToFieldType>::create(0, scale);
const typename ColumnDecimal<FromFieldType>::Container & vec_from = col_from->getData();
typename ColumnDecimal<ToFieldType>::Container & vec_to = col_to->getData();
size_t size = vec_from.size();
vec_to.resize(size);
for (size_t i = 0; i < size; ++i)
{
vec_to[i] = ToDecimal<FromFieldType, ToFieldType>(vec_from[i], vec_from.getScale(), scale);
}
block.getByPosition(result).column = std::move(col_to);
}
else
{
if (const auto * col_from
= checkAndGetColumn<ColumnVector<FromFieldType>>(block.getByPosition(arguments[0]).column.get()))
{
auto col_to = ColumnDecimal<ToFieldType>::create(0, scale);
const typename ColumnVector<FromFieldType>::Container & vec_from = col_from->getData();
typename ColumnDecimal<ToFieldType>::Container & vec_to = col_to->getData();
size_t size = vec_from.size();
vec_to.resize(size);
for (size_t i = 0; i < size; ++i)
{
vec_to[i] = ToDecimal<FromFieldType, ToFieldType>(vec_from[i], scale);
}
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);
}
}
};
/** Throw exception with verbose message when string value is not parsed completely.
*/
void throwExceptionForIncompletelyParsedValue(ReadBuffer & read_buffer, Block & block, size_t result);
template <typename Name, typename ToDataType>
struct ConvertToDecimalImpl<DataTypeString, Name, ToDataType>
{
static void execute(Block & block, const ColumnNumbers & arguments, size_t result, PrecType, ScaleType)
{
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 auto * col_from_string = checkAndGetColumn<ColumnString>(&col_from))
{
auto res = data_type_to.createColumn();
IColumn & column_to = *res;
column_to.reserve(size);
const ColumnString::Chars_t & chars = col_from_string->getChars();
const IColumn::Offsets & offsets = col_from_string->getOffsets();
size_t current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
ReadBufferFromMemory read_buffer(&chars[current_offset], offsets[i] - current_offset - 1);
data_type_to.deserializeTextEscaped(column_to, read_buffer);
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);
}
};
/** 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)); }
};
template <typename Name>
struct ConvertImpl<DataTypeDate, DataTypeDateTime, Name> : DateTimeTransformImpl<UInt16, UInt32, ToDateTimeImpl>
{
};
struct MyDateTimeToMyDateTransform
{
static constexpr auto name = "toMyDate";
static inline UInt64 execute(const UInt64 & datetime, const DateLUTImpl &)
{
// clear all the bit except year-month-day
return datetime & MyTimeBase::YMD_MASK;
}
};
struct MyDateToMyDateTimeTransform
{
static constexpr auto name = "toMyDateTime";
static inline UInt64 execute(const UInt64 & date, const DateLUTImpl &) { return date; }
};
template <typename FromType, typename ToType>
struct ToMyDateTransform32Or64
{
static constexpr auto name = "toMyDate";
static inline ToType execute(const FromType &, const DateLUTImpl &)
{
// todo support transformation from numeric type to MyDate
throw Exception("toMyDate from source type is not supported yet");
}
};
template <typename FromType, typename ToType>
struct ToMyDateTimeTransform32Or64
{
static constexpr auto name = "toMyDateTime";
static inline ToType execute(const FromType &, const DateLUTImpl &)
{
// todo support transformation from numeric type to MyDateTime
throw Exception("toMyDateTime from source type is not supported yet");
}
};
/// Implementation of toDate function.
template <typename FromType, typename ToType>
struct ToDateTransform32Or64
{
static constexpr auto name = "toDate";
static inline ToType execute(const FromType & from, const DateLUTImpl & time_zone)
{
return (from < 0xFFFF) ? from : time_zone.toDayNum(from);
}
};
/** Conversion of DateTime to Date: throw off time component.
*/
template <typename Name>
struct ConvertImpl<DataTypeDateTime, DataTypeDate, Name> : DateTimeTransformImpl<UInt32, UInt16, ToDateImpl>
{
};
/** Special case of converting (U)Int32 or (U)Int64 (and also, for convenience, Float32, Float64) to Date.
* If number is less than 65536, then it is treated as DayNum, and if greater or equals, then as unix timestamp.
* 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<UInt32, UInt16, ToDateTransform32Or64<UInt32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeUInt64, DataTypeDate, Name>
: DateTimeTransformImpl<UInt64, UInt16, ToDateTransform32Or64<UInt64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeInt32, DataTypeDate, Name>
: DateTimeTransformImpl<Int32, UInt16, ToDateTransform32Or64<Int32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeInt64, DataTypeDate, Name>
: DateTimeTransformImpl<Int64, UInt16, ToDateTransform32Or64<Int64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeFloat32, DataTypeDate, Name>
: DateTimeTransformImpl<Float32, UInt16, ToDateTransform32Or64<Float32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeFloat64, DataTypeDate, Name>
: DateTimeTransformImpl<Float64, UInt16, ToDateTransform32Or64<Float64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeMyDateTime, DataTypeMyDate, Name>
: DateTimeTransformImpl<UInt64, UInt64, MyDateTimeToMyDateTransform>
{
};
template <typename Name>
struct ConvertImpl<DataTypeUInt32, DataTypeMyDate, Name>
: DateTimeTransformImpl<UInt32, UInt64, ToMyDateTransform32Or64<UInt32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeUInt64, DataTypeMyDate, Name>
: DateTimeTransformImpl<UInt64, UInt64, ToMyDateTransform32Or64<UInt64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeInt32, DataTypeMyDate, Name>
: DateTimeTransformImpl<Int32, UInt64, ToMyDateTransform32Or64<Int32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeInt64, DataTypeMyDate, Name>
: DateTimeTransformImpl<Int64, UInt64, ToMyDateTransform32Or64<Int64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeFloat32, DataTypeMyDate, Name>
: DateTimeTransformImpl<Float32, UInt64, ToMyDateTransform32Or64<Float32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeFloat64, DataTypeMyDate, Name>
: DateTimeTransformImpl<Float64, UInt64, ToMyDateTransform32Or64<Float64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeMyDate, DataTypeMyDateTime, Name>
: DateTimeTransformImpl<UInt64, UInt64, MyDateToMyDateTimeTransform>
{
};
template <typename Name>
struct ConvertImpl<DataTypeUInt32, DataTypeMyDateTime, Name>
: DateTimeTransformImpl<UInt32, UInt64, ToMyDateTimeTransform32Or64<UInt32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeUInt64, DataTypeMyDateTime, Name>
: DateTimeTransformImpl<UInt64, UInt64, ToMyDateTimeTransform32Or64<UInt64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeInt32, DataTypeMyDateTime, Name>
: DateTimeTransformImpl<Int32, UInt64, ToMyDateTimeTransform32Or64<Int32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeInt64, DataTypeMyDateTime, Name>
: DateTimeTransformImpl<Int64, UInt64, ToMyDateTimeTransform32Or64<Int64, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeFloat32, DataTypeMyDateTime, Name>
: DateTimeTransformImpl<Float32, UInt64, ToMyDateTimeTransform32Or64<Float32, UInt16>>
{
};
template <typename Name>
struct ConvertImpl<DataTypeFloat64, DataTypeMyDateTime, Name>
: DateTimeTransformImpl<Float64, UInt64, ToMyDateTimeTransform32Or64<Float64, UInt16>>
{
};
/** 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<DataTypeMyDate>
{
static void execute(
const DataTypeMyDate::FieldType x,
WriteBuffer & wb,
const DataTypeMyDate *,
const DateLUTImpl *)
{
writeMyDateText((x), wb);
}
};
template <>
struct FormatImpl<DataTypeMyDateTime>
{
static void execute(
const DataTypeMyDateTime::FieldType x,
WriteBuffer & wb,
const DataTypeMyDateTime * tp,
const DateLUTImpl *)
{
writeMyDateTimeText(x, tp->getFraction(), wb);
}
};
template <typename DecimalType>
struct FormatImpl<DataTypeDecimal<DecimalType>>
{
static void execute(
const typename DataTypeDecimal<DecimalType>::FieldType v,
WriteBuffer & wb,
const DataTypeDecimal<DecimalType> * tp,
const DateLUTImpl *)
{
writeText(v, tp->getScale(), wb);
}
};
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);
}
};
/// 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)
{
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;
static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
{
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>)
time_zone = &extractTimeZoneFromFunctionArguments(block, arguments, 1, 0);
if (const auto col_from = checkAndGetColumn<ColumnVector<FromFieldType>>(col_with_type_and_name.column.get()))
{
auto col_to = ColumnString::create();
const typename ColumnVector<FromFieldType>::Container & vec_from = col_from->getData();
ColumnString::Chars_t & 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
data_to.resize(size * 3); /// Arbitary
offsets_to.resize(size);
WriteBufferFromVector<ColumnString::Chars_t> 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();
}
data_to.resize(write_buffer.count());
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_t & data_to = col_to->getChars();
ColumnString::Offsets & offsets_to = col_to->getOffsets();
data_to.resize(size * 2); /// Using coefficient 2 for initial size is arbitary.
offsets_to.resize(size);
WriteBufferFromVector<ColumnString::Chars_t> write_buffer(data_to);
for (size_t i = 0; i < size; ++i)
{
type.serializeText(col_from, i, write_buffer);
writeChar(0, write_buffer);
offsets_to[i] = write_buffer.count();
}
data_to.resize(write_buffer.count());
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<DataTypeMyDate>(DataTypeMyDate::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
UInt64 tmp(0);
readMyDateText(tmp, rb);
x = tmp;
}
template <>
inline void parseImpl<DataTypeMyDateTime>(DataTypeMyDateTime::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
UInt64 tmp(0);
readMyDateTimeText(tmp, 6, rb); // set max fsp doesn't matter
x = tmp;
}
template <>
inline void parseImpl<DataTypeUUID>(DataTypeUUID::FieldType & x, ReadBuffer & rb, const DateLUTImpl *)
{
UUID tmp;
readText(tmp, rb);
x = tmp.toUnderType();
}
template <typename DataType>
bool tryParseImpl(typename DataType::FieldType & x, ReadBuffer & rb)
{
if constexpr (std::is_same_v<DataType, DataTypeMyDate>)
return tryReadMyDateText(x, rb);
else if constexpr (std::is_same_v<DataType, DataTypeMyDateTime>)
return tryReadMyDateTimeText(x, 6, rb);
else if constexpr (std::is_integral_v<typename DataType::FieldType>)
return tryReadIntText(x, rb);
else if constexpr (std::is_floating_point_v<typename DataType::FieldType>)
return tryReadFloatText(x, rb);
throw Exception("Illegal data type.", ErrorCodes::TYPE_MISMATCH);
/// NOTE Need to implement for Date and DateTime too.
}
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.
};
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");
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>
|| std::is_same_v<ToDataType, DataTypeMyDate>)&&(in.buffer().size())
== strlen("YYYY-MM-DD hh:mm:ss"))
return true;
return false;
}
static void execute(Block & block, const ColumnNumbers & arguments, size_t result)
{
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>)
{
local_time_zone = &extractTimeZoneFromFunctionArguments(block, arguments, 1, 0);
if constexpr (parsing_mode == ConvertFromStringParsingMode::BestEffort)
utc_time_zone = &DateLUT::instance("UTC");
}
const IColumn * col_from = block.getByPosition(arguments[0]).column.get();
const auto * col_from_string = checkAndGetColumn<ColumnString>(col_from);
const auto * 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 = block.rows();
auto col_to = ColumnVector<ToFieldType>::create(size);
typename ColumnVector<ToFieldType>::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_t * 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)
{
time_t res;
parseDateTimeBestEffort(res, read_buffer, *local_time_zone, *utc_time_zone);
vec_to[i] = res;
}
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)
{
time_t res;
parsed = tryParseDateTimeBestEffort(res, read_buffer, *local_time_zone, *utc_time_zone);
vec_to[i] = res;
}
else
{
parsed = tryParseImpl<ToDataType>(vec_to[i], read_buffer) && 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 auto * col_from_string = checkAndGetColumn<ColumnString>(&col_from))
{
auto res = data_type_to.createColumn();
IColumn & column_to = *res;
column_to.reserve(size);
const ColumnString::Chars_t & chars = col_from_string->getChars();
const IColumn::Offsets & offsets = col_from_string->getOffsets();
size_t current_offset = 0;
for (size_t i = 0; i < size; ++i)
{
ReadBufferFromMemory read_buffer(&chars[current_offset], offsets[i] - current_offset - 1);
data_type_to.deserializeTextEscaped(column_to, read_buffer);
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)
{
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)
{
if (const auto * col_from
= checkAndGetColumn<ColumnFixedString>(block.getByPosition(arguments[0]).column.get()))
{