ClickHouse/dbms/include/DB/Functions/FunctionsTransform.h
alexey-milovidov 6d5bfc8c6f Refactoring of numeric DataTypes (#581)
* Better code [#CLICKHOUSE-2].

* Addition to prev. revision [#CLICKHOUSE-2].

* Addition to prev. revision [#CLICKHOUSE-2].

* Addition to prev. revision [#CLICKHOUSE-2].
2017-03-12 14:13:45 +04:00

844 lines
32 KiB
C++
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#pragma once
#include <mutex>
#include <DB/Core/FieldVisitors.h>
#include <DB/DataTypes/DataTypesNumber.h>
#include <DB/DataTypes/DataTypeString.h>
#include <DB/DataTypes/DataTypeArray.h>
#include <DB/Columns/ColumnString.h>
#include <DB/Columns/ColumnConst.h>
#include <DB/Columns/ColumnsNumber.h>
#include <DB/Common/Arena.h>
#include <DB/Core/StringRef.h>
#include <DB/Common/HashTable/HashMap.h>
#include <DB/Functions/IFunction.h>
#include <DB/DataTypes/EnrichedDataTypePtr.h>
namespace DB
{
/** transform(x, from_array, to_array[, default]) - преобразовать x согласно переданному явным образом соответствию.
*/
DataTypeTraits::EnrichedDataTypePtr getSmallestCommonNumericType(const DataTypeTraits::EnrichedDataTypePtr & type1, const IDataType & type2);
/** transform(x, [from...], [to...], default)
* - преобразует значения согласно явно указанному отображению.
*
* x - что преобразовывать.
* from - константный массив значений для преобразования.
* to - константный массив значений, в которые должны быть преобразованы значения из from.
* default - какое значение использовать, если x не равен ни одному из значений во from.
* from и to - массивы одинаковых размеров.
*
* Типы:
* transform(T, Array(T), Array(U), U) -> U
*
* transform(x, [from...], [to...])
* - eсли default не указан, то для значений x, для которых нет соответствующего элемента во from, возвращается не изменённое значение x.
*
* Типы:
* transform(T, Array(T), Array(T)) -> T
*
* Замечание: реализация довольно громоздкая.
*/
class FunctionTransform : public IFunction
{
public:
static constexpr auto name = "transform";
static FunctionPtr create(const Context &) { return std::make_shared<FunctionTransform>(); }
String getName() const override
{
return name;
}
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }
DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
{
const auto args_size = arguments.size();
if (args_size != 3 && args_size != 4)
throw Exception{
"Number of arguments for function " + getName() + " doesn't match: passed " +
toString(args_size) + ", should be 3 or 4",
ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH};
const IDataType * type_x = arguments[0].get();
if (!type_x->isNumeric() && !typeid_cast<const DataTypeString *>(type_x))
throw Exception{"Unsupported type " + type_x->getName()
+ " of first argument of function " + getName()
+ ", must be numeric type or Date/DateTime or String", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
const DataTypeArray * type_arr_from = typeid_cast<const DataTypeArray *>(arguments[1].get());
if (!type_arr_from)
throw Exception{"Second argument of function " + getName()
+ ", must be array of source values to transform from.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
const auto type_arr_from_nested = type_arr_from->getNestedType();
if ((type_x->isNumeric() != type_arr_from_nested->isNumeric())
|| (!!typeid_cast<const DataTypeString *>(type_x) != !!typeid_cast<const DataTypeString *>(type_arr_from_nested.get())))
{
throw Exception{"First argument and elements of array of second argument of function " + getName()
+ " must have compatible types: both numeric or both strings.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
}
const DataTypeArray * type_arr_to = typeid_cast<const DataTypeArray *>(arguments[2].get());
if (!type_arr_to)
throw Exception{"Third argument of function " + getName()
+ ", must be array of destination values to transform to.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
const auto enriched_type_arr_to_nested = type_arr_to->getEnrichedNestedType();
const auto & type_arr_to_nested = enriched_type_arr_to_nested.first;
if (args_size == 3)
{
if ((type_x->isNumeric() != type_arr_to_nested->isNumeric())
|| (!!typeid_cast<const DataTypeString *>(type_x) != !!typeid_cast<const DataTypeString *>(type_arr_to_nested.get())))
throw Exception{"Function " + getName()
+ " has signature: transform(T, Array(T), Array(U), U) -> U; or transform(T, Array(T), Array(T)) -> T; where T and U are types.",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
return type_x->clone();
}
else
{
const IDataType * type_default = arguments[3].get();
if (!type_default->isNumeric() && !typeid_cast<const DataTypeString *>(type_default))
throw Exception{"Unsupported type " + type_default->getName()
+ " of fourth argument (default value) of function " + getName()
+ ", must be numeric type or Date/DateTime or String", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
if ((type_default->isNumeric() != type_arr_to_nested->isNumeric())
|| (!!typeid_cast<const DataTypeString *>(type_default) != !!typeid_cast<const DataTypeString *>(type_arr_to_nested.get())))
throw Exception{"Function " + getName()
+ " have signature: transform(T, Array(T), Array(U), U) -> U; or transform(T, Array(T), Array(T)) -> T; where T and U are types.",
ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT};
if (type_arr_to_nested->behavesAsNumber() && type_default->behavesAsNumber())
{
/// Берём наименьший общий тип для элементов массива значений to и для default-а.
DataTypeTraits::EnrichedDataTypePtr res = getSmallestCommonNumericType(enriched_type_arr_to_nested, *type_default);
return res.first;
}
/// TODO Больше проверок.
return type_arr_to_nested->clone();
}
}
void executeImpl(Block & block, const ColumnNumbers & arguments, const size_t result) override
{
const ColumnConstArray * array_from = typeid_cast<const ColumnConstArray *>(block.safeGetByPosition(arguments[1]).column.get());
const ColumnConstArray * array_to = typeid_cast<const ColumnConstArray *>(block.safeGetByPosition(arguments[2]).column.get());
if (!array_from || !array_to)
throw Exception{"Second and third arguments of function " + getName() + " must be constant arrays.", ErrorCodes::ILLEGAL_COLUMN};
prepare(array_from->getData(), array_to->getData(), block, arguments);
const auto in = block.safeGetByPosition(arguments.front()).column.get();
if (in->isConst())
{
executeConst(block, arguments, result);
return;
}
const IColumn * default_column = nullptr;
if (arguments.size() == 4)
default_column = block.safeGetByPosition(arguments[3]).column.get();
auto column_result = block.safeGetByPosition(result).type->createColumn();
auto out = column_result.get();
if (!executeNum<UInt8>(in, out, default_column)
&& !executeNum<UInt16>(in, out, default_column)
&& !executeNum<UInt32>(in, out, default_column)
&& !executeNum<UInt64>(in, out, default_column)
&& !executeNum<Int8>(in, out, default_column)
&& !executeNum<Int16>(in, out, default_column)
&& !executeNum<Int32>(in, out, default_column)
&& !executeNum<Int64>(in, out, default_column)
&& !executeNum<Float32>(in, out, default_column)
&& !executeNum<Float64>(in, out, default_column)
&& !executeString(in, out, default_column))
{
throw Exception{
"Illegal column " + in->getName() + " of first argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
block.safeGetByPosition(result).column = column_result;
}
private:
void executeConst(Block & block, const ColumnNumbers & arguments, const size_t result)
{
/// Составим блок из полноценных столбцов размера 1 и вычислим функцию как обычно.
Block tmp_block;
ColumnNumbers tmp_arguments;
tmp_block.insert(block.safeGetByPosition(arguments[0]));
tmp_block.safeGetByPosition(0).column = static_cast<IColumnConst *>(tmp_block.safeGetByPosition(0).column->cloneResized(1).get())->convertToFullColumn();
tmp_arguments.push_back(0);
for (size_t i = 1; i < arguments.size(); ++i)
{
tmp_block.insert(block.safeGetByPosition(arguments[i]));
tmp_arguments.push_back(i);
}
tmp_block.insert(block.safeGetByPosition(result));
size_t tmp_result = arguments.size();
execute(tmp_block, tmp_arguments, tmp_result);
block.safeGetByPosition(result).column = block.safeGetByPosition(result).type->createConstColumn(
block.rows(),
(*tmp_block.safeGetByPosition(tmp_result).column)[0]);
}
template <typename T>
bool executeNum(const IColumn * in_untyped, IColumn * out_untyped, const IColumn * default_untyped)
{
if (const auto in = typeid_cast<const ColumnVector<T> *>(in_untyped))
{
if (!default_untyped)
{
auto out = typeid_cast<ColumnVector<T> *>(out_untyped);
if (!out)
{
throw Exception{
"Illegal column " + out_untyped->getName() + " of elements of array of third argument of function " + getName()
+ ", must be " + in->getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
executeImplNumToNum<T>(in->getData(), out->getData());
}
else if (default_untyped->isConst())
{
if (!executeNumToNumWithConstDefault<T, UInt8>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, UInt16>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, UInt32>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, UInt64>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, Int8>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, Int16>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, Int32>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, Int64>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, Float32>(in, out_untyped)
&& !executeNumToNumWithConstDefault<T, Float64>(in, out_untyped)
&& !executeNumToStringWithConstDefault<T>(in, out_untyped))
{
throw Exception{
"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
}
else
{
if (!executeNumToNumWithNonConstDefault<T, UInt8>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, UInt16>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, UInt32>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, UInt64>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, Int8>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, Int16>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, Int32>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, Int64>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, Float32>(in, out_untyped, default_untyped)
&& !executeNumToNumWithNonConstDefault<T, Float64>(in, out_untyped, default_untyped)
&& !executeNumToStringWithNonConstDefault<T>(in, out_untyped, default_untyped))
{
throw Exception{
"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
}
return true;
}
return false;
}
bool executeString(const IColumn * in_untyped, IColumn * out_untyped, const IColumn * default_untyped)
{
if (const auto in = typeid_cast<const ColumnString *>(in_untyped))
{
if (!default_untyped)
{
if (!executeStringToString(in, out_untyped))
{
throw Exception{
"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
}
else if (default_untyped->isConst())
{
if (!executeStringToNumWithConstDefault<UInt8>(in, out_untyped)
&& !executeStringToNumWithConstDefault<UInt16>(in, out_untyped)
&& !executeStringToNumWithConstDefault<UInt32>(in, out_untyped)
&& !executeStringToNumWithConstDefault<UInt64>(in, out_untyped)
&& !executeStringToNumWithConstDefault<Int8>(in, out_untyped)
&& !executeStringToNumWithConstDefault<Int16>(in, out_untyped)
&& !executeStringToNumWithConstDefault<Int32>(in, out_untyped)
&& !executeStringToNumWithConstDefault<Int64>(in, out_untyped)
&& !executeStringToNumWithConstDefault<Float32>(in, out_untyped)
&& !executeStringToNumWithConstDefault<Float64>(in, out_untyped)
&& !executeStringToStringWithConstDefault(in, out_untyped))
{
throw Exception{
"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
}
else
{
if (!executeStringToNumWithNonConstDefault<UInt8>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<UInt16>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<UInt32>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<UInt64>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<Int8>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<Int16>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<Int32>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<Int64>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<Float32>(in, out_untyped, default_untyped)
&& !executeStringToNumWithNonConstDefault<Float64>(in, out_untyped, default_untyped)
&& !executeStringToStringWithNonConstDefault(in, out_untyped, default_untyped))
{
throw Exception{
"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
}
return true;
}
return false;
}
template <typename T, typename U>
bool executeNumToNumWithConstDefault(const ColumnVector<T> * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
if (!out)
return false;
executeImplNumToNumWithConstDefault<T, U>(in->getData(), out->getData(), const_default_value.get<U>());
return true;
}
template <typename T, typename U>
bool executeNumToNumWithNonConstDefault(const ColumnVector<T> * in, IColumn * out_untyped, const IColumn * default_untyped)
{
auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
if (!out)
return false;
if (!executeNumToNumWithNonConstDefault2<T, U, UInt8>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, UInt16>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, UInt32>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, UInt64>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, Int8>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, Int16>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, Int32>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, Int64>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, Float32>(in, out, default_untyped)
&& !executeNumToNumWithNonConstDefault2<T, U, Float64>(in, out, default_untyped))
{
throw Exception(
"Illegal column " + default_untyped->getName() + " of fourth argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN);
}
return true;
}
template <typename T, typename U, typename V>
bool executeNumToNumWithNonConstDefault2(const ColumnVector<T> * in, ColumnVector<U> * out, const IColumn * default_untyped)
{
auto col_default = typeid_cast<const ColumnVector<V> *>(default_untyped);
if (!col_default)
return false;
executeImplNumToNumWithNonConstDefault<T, U, V>(in->getData(), out->getData(), col_default->getData());
return true;
}
template <typename T>
bool executeNumToStringWithConstDefault(const ColumnVector<T> * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnString *>(out_untyped);
if (!out)
return false;
const String & default_str = const_default_value.get<const String &>();
StringRef default_string_ref{default_str.data(), default_str.size() + 1};
executeImplNumToStringWithConstDefault<T>(in->getData(), out->getChars(), out->getOffsets(), default_string_ref);
return true;
}
template <typename T>
bool executeNumToStringWithNonConstDefault(const ColumnVector<T> * in, IColumn * out_untyped, const IColumn * default_untyped)
{
auto out = typeid_cast<ColumnString *>(out_untyped);
if (!out)
return false;
auto default_col = typeid_cast<const ColumnString *>(default_untyped);
if (!default_col)
{
throw Exception{"Illegal column " + default_untyped->getName() + " of fourth argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
executeImplNumToStringWithNonConstDefault<T>(
in->getData(),
out->getChars(), out->getOffsets(),
default_col->getChars(), default_col->getOffsets());
return true;
}
template <typename U>
bool executeStringToNumWithConstDefault(const ColumnString * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
if (!out)
return false;
executeImplStringToNumWithConstDefault<U>(in->getChars(), in->getOffsets(), out->getData(), const_default_value.get<U>());
return true;
}
template <typename U>
bool executeStringToNumWithNonConstDefault(const ColumnString * in, IColumn * out_untyped, const IColumn * default_untyped)
{
auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
if (!out)
return false;
if (!executeStringToNumWithNonConstDefault2<U, UInt8>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, UInt16>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, UInt32>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, UInt64>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, Int8>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, Int16>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, Int32>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, Int64>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, Float32>(in, out, default_untyped)
&& !executeStringToNumWithNonConstDefault2<U, Float64>(in, out, default_untyped))
{
throw Exception{"Illegal column " + default_untyped->getName() + " of fourth argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
return true;
}
template <typename U, typename V>
bool executeStringToNumWithNonConstDefault2(const ColumnString * in, ColumnVector<U> * out, const IColumn * default_untyped)
{
auto col_default = typeid_cast<const ColumnVector<V> *>(default_untyped);
if (!col_default)
return false;
executeImplStringToNumWithNonConstDefault<U, V>(in->getChars(), in->getOffsets(), out->getData(), col_default->getData());
return true;
}
bool executeStringToString(const ColumnString * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnString *>(out_untyped);
if (!out)
return false;
executeImplStringToString(in->getChars(), in->getOffsets(), out->getChars(), out->getOffsets());
return true;
}
bool executeStringToStringWithConstDefault(const ColumnString * in, IColumn * out_untyped)
{
auto out = typeid_cast<ColumnString *>(out_untyped);
if (!out)
return false;
const String & default_str = const_default_value.get<const String &>();
StringRef default_string_ref{default_str.data(), default_str.size() + 1};
executeImplStringToStringWithConstDefault(in->getChars(), in->getOffsets(), out->getChars(), out->getOffsets(), default_string_ref);
return true;
}
bool executeStringToStringWithNonConstDefault(const ColumnString * in, IColumn * out_untyped, const IColumn * default_untyped)
{
auto out = typeid_cast<ColumnString *>(out_untyped);
if (!out)
return false;
auto default_col = typeid_cast<const ColumnString *>(default_untyped);
if (!default_col)
{
throw Exception{"Illegal column " + default_untyped->getName() + " of fourth argument of function " + getName(),
ErrorCodes::ILLEGAL_COLUMN};
}
executeImplStringToStringWithNonConstDefault(
in->getChars(), in->getOffsets(),
out->getChars(), out->getOffsets(),
default_col->getChars(), default_col->getOffsets());
return true;
}
template <typename T, typename U>
void executeImplNumToNumWithConstDefault(const PaddedPODArray<T> & src, PaddedPODArray<U> & dst, U dst_default)
{
const auto & table = *table_num_to_num;
size_t size = src.size();
dst.resize(size);
for (size_t i = 0; i < size; ++i)
{
auto it = table.find(src[i]);
if (it != table.end())
memcpy(&dst[i], &it->second, sizeof(dst[i])); /// little endian.
else
dst[i] = dst_default;
}
}
template <typename T, typename U, typename V>
void executeImplNumToNumWithNonConstDefault(const PaddedPODArray<T> & src, PaddedPODArray<U> & dst, const PaddedPODArray<V> & dst_default)
{
const auto & table = *table_num_to_num;
size_t size = src.size();
dst.resize(size);
for (size_t i = 0; i < size; ++i)
{
auto it = table.find(src[i]);
if (it != table.end())
memcpy(&dst[i], &it->second, sizeof(dst[i])); /// little endian.
else
dst[i] = dst_default[i];
}
}
template <typename T>
void executeImplNumToNum(const PaddedPODArray<T> & src, PaddedPODArray<T> & dst)
{
const auto & table = *table_num_to_num;
size_t size = src.size();
dst.resize(size);
for (size_t i = 0; i < size; ++i)
{
auto it = table.find(src[i]);
if (it != table.end())
memcpy(&dst[i], &it->second, sizeof(dst[i]));
else
dst[i] = src[i];
}
}
template <typename T>
void executeImplNumToStringWithConstDefault(const PaddedPODArray<T> & src,
ColumnString::Chars_t & dst_data, ColumnString::Offsets_t & dst_offsets, StringRef dst_default)
{
const auto & table = *table_num_to_string;
size_t size = src.size();
dst_offsets.resize(size);
ColumnString::Offset_t current_dst_offset = 0;
for (size_t i = 0; i < size; ++i)
{
auto it = table.find(src[i]);
StringRef ref = it != table.end() ? it->second : dst_default;
dst_data.resize(current_dst_offset + ref.size);
memcpy(&dst_data[current_dst_offset], ref.data, ref.size);
current_dst_offset += ref.size;
dst_offsets[i] = current_dst_offset;
}
}
template <typename T>
void executeImplNumToStringWithNonConstDefault(const PaddedPODArray<T> & src,
ColumnString::Chars_t & dst_data, ColumnString::Offsets_t & dst_offsets,
const ColumnString::Chars_t & dst_default_data, const ColumnString::Offsets_t & dst_default_offsets)
{
const auto & table = *table_num_to_string;
size_t size = src.size();
dst_offsets.resize(size);
ColumnString::Offset_t current_dst_offset = 0;
ColumnString::Offset_t current_dst_default_offset = 0;
for (size_t i = 0; i < size; ++i)
{
auto it = table.find(src[i]);
StringRef ref;
if (it != table.end())
ref = it->second;
else
{
ref.data = reinterpret_cast<const char *>(&dst_default_data[current_dst_default_offset]);
ref.size = dst_default_offsets[i] - current_dst_default_offset;
}
dst_data.resize(current_dst_offset + ref.size);
memcpy(&dst_data[current_dst_offset], ref.data, ref.size);
current_dst_offset += ref.size;
current_dst_default_offset = dst_default_offsets[i];
dst_offsets[i] = current_dst_offset;
}
}
template <typename U>
void executeImplStringToNumWithConstDefault(
const ColumnString::Chars_t & src_data, const ColumnString::Offsets_t & src_offsets,
PaddedPODArray<U> & dst, U dst_default)
{
const auto & table = *table_string_to_num;
size_t size = src_offsets.size();
dst.resize(size);
ColumnString::Offset_t current_src_offset = 0;
for (size_t i = 0; i < size; ++i)
{
StringRef ref{&src_data[current_src_offset], src_offsets[i] - current_src_offset};
current_src_offset = src_offsets[i];
auto it = table.find(ref);
if (it != table.end())
memcpy(&dst[i], &it->second, sizeof(dst[i]));
else
dst[i] = dst_default;
}
}
template <typename U, typename V>
void executeImplStringToNumWithNonConstDefault(
const ColumnString::Chars_t & src_data, const ColumnString::Offsets_t & src_offsets,
PaddedPODArray<U> & dst, const PaddedPODArray<V> & dst_default)
{
const auto & table = *table_string_to_num;
size_t size = src_offsets.size();
dst.resize(size);
ColumnString::Offset_t current_src_offset = 0;
for (size_t i = 0; i < size; ++i)
{
StringRef ref{&src_data[current_src_offset], src_offsets[i] - current_src_offset};
current_src_offset = src_offsets[i];
auto it = table.find(ref);
if (it != table.end())
memcpy(&dst[i], &it->second, sizeof(dst[i]));
else
dst[i] = dst_default[i];
}
}
template <bool with_default>
void executeImplStringToStringWithOrWithoutConstDefault(
const ColumnString::Chars_t & src_data, const ColumnString::Offsets_t & src_offsets,
ColumnString::Chars_t & dst_data, ColumnString::Offsets_t & dst_offsets, StringRef dst_default)
{
const auto & table = *table_string_to_string;
size_t size = src_offsets.size();
dst_offsets.resize(size);
ColumnString::Offset_t current_src_offset = 0;
ColumnString::Offset_t current_dst_offset = 0;
for (size_t i = 0; i < size; ++i)
{
StringRef src_ref{&src_data[current_src_offset], src_offsets[i] - current_src_offset};
current_src_offset = src_offsets[i];
auto it = table.find(src_ref);
StringRef dst_ref = it != table.end() ? it->second : (with_default ? dst_default : src_ref);
dst_data.resize(current_dst_offset + dst_ref.size);
memcpy(&dst_data[current_dst_offset], dst_ref.data, dst_ref.size);
current_dst_offset += dst_ref.size;
dst_offsets[i] = current_dst_offset;
}
}
void executeImplStringToString(
const ColumnString::Chars_t & src_data, const ColumnString::Offsets_t & src_offsets,
ColumnString::Chars_t & dst_data, ColumnString::Offsets_t & dst_offsets)
{
executeImplStringToStringWithOrWithoutConstDefault<false>(src_data, src_offsets, dst_data, dst_offsets, {});
}
void executeImplStringToStringWithConstDefault(
const ColumnString::Chars_t & src_data, const ColumnString::Offsets_t & src_offsets,
ColumnString::Chars_t & dst_data, ColumnString::Offsets_t & dst_offsets, StringRef dst_default)
{
executeImplStringToStringWithOrWithoutConstDefault<true>(src_data, src_offsets, dst_data, dst_offsets, dst_default);
}
void executeImplStringToStringWithNonConstDefault(
const ColumnString::Chars_t & src_data, const ColumnString::Offsets_t & src_offsets,
ColumnString::Chars_t & dst_data, ColumnString::Offsets_t & dst_offsets,
const ColumnString::Chars_t & dst_default_data, const ColumnString::Offsets_t & dst_default_offsets)
{
const auto & table = *table_string_to_string;
size_t size = src_offsets.size();
dst_offsets.resize(size);
ColumnString::Offset_t current_src_offset = 0;
ColumnString::Offset_t current_dst_offset = 0;
ColumnString::Offset_t current_dst_default_offset = 0;
for (size_t i = 0; i < size; ++i)
{
StringRef src_ref{&src_data[current_src_offset], src_offsets[i] - current_src_offset};
current_src_offset = src_offsets[i];
auto it = table.find(src_ref);
StringRef dst_ref;
if (it != table.end())
dst_ref = it->second;
else
{
dst_ref.data = reinterpret_cast<const char *>(&dst_default_data[current_dst_default_offset]);
dst_ref.size = dst_default_offsets[i] - current_dst_default_offset;
}
dst_data.resize(current_dst_offset + dst_ref.size);
memcpy(&dst_data[current_dst_offset], dst_ref.data, dst_ref.size);
current_dst_offset += dst_ref.size;
current_dst_default_offset = dst_default_offsets[i];
dst_offsets[i] = current_dst_offset;
}
}
/// Разные варианты хэш-таблиц для реализации отображения.
using NumToNum = HashMap<UInt64, UInt64, HashCRC32<UInt64>>;
using NumToString = HashMap<UInt64, StringRef, HashCRC32<UInt64>>; /// Везде StringRef-ы с завершающим нулём.
using StringToNum = HashMap<StringRef, UInt64, StringRefHash>;
using StringToString = HashMap<StringRef, StringRef, StringRefHash>;
std::unique_ptr<NumToNum> table_num_to_num;
std::unique_ptr<NumToString> table_num_to_string;
std::unique_ptr<StringToNum> table_string_to_num;
std::unique_ptr<StringToString> table_string_to_string;
Arena string_pool;
Field const_default_value; /// Null, если не задано.
bool prepared = false;
std::mutex mutex;
/// Может вызываться из разных потоков. Срабатывает только при первом вызове.
void prepare(const Array & from, const Array & to, Block & block, const ColumnNumbers & arguments)
{
if (prepared)
return;
const size_t size = from.size();
if (0 == size)
throw Exception{"Empty arrays are illegal in function " + getName(), ErrorCodes::BAD_ARGUMENTS};
std::lock_guard<std::mutex> lock(mutex);
if (prepared)
return;
if (from.size() != to.size())
throw Exception{"Second and third arguments of function " + getName() + " must be arrays of same size", ErrorCodes::BAD_ARGUMENTS};
Array converted_to;
const Array * used_to = &to;
/// Задано ли значение по-умолчанию.
if (arguments.size() == 4)
{
const IColumn * default_col = block.safeGetByPosition(arguments[3]).column.get();
const IColumnConst * const_default_col = dynamic_cast<const IColumnConst *>(default_col);
if (const_default_col)
const_default_value = (*const_default_col)[0];
/// Нужно ли преобразовать элементы to и default_value к наименьшему общему типу, который является Float64?
bool default_col_is_float =
typeid_cast<const ColumnFloat32 *>(default_col)
|| typeid_cast<const ColumnFloat64 *>(default_col)
|| typeid_cast<const ColumnConstFloat32 *>(default_col)
|| typeid_cast<const ColumnConstFloat64 *>(default_col);
bool to_is_float = to[0].getType() == Field::Types::Float64;
if (default_col_is_float && !to_is_float)
{
converted_to.resize(to.size());
for (size_t i = 0, size = to.size(); i < size; ++i)
converted_to[i] = applyVisitor(FieldVisitorConvertToNumber<Float64>(), to[i]);
used_to = &converted_to;
}
else if (!default_col_is_float && to_is_float)
{
if (const_default_col)
const_default_value = applyVisitor(FieldVisitorConvertToNumber<Float64>(), const_default_value);
}
}
/// Замечание: не делается проверка дубликатов в массиве from.
if (from[0].getType() != Field::Types::String && to[0].getType() != Field::Types::String)
{
table_num_to_num = std::make_unique<NumToNum>();
auto & table = *table_num_to_num;
for (size_t i = 0; i < size; ++i)
table[from[i].get<UInt64>()] = (*used_to)[i].get<UInt64>();
}
else if (from[0].getType() != Field::Types::String && to[0].getType() == Field::Types::String)
{
table_num_to_string = std::make_unique<NumToString>();
auto & table = *table_num_to_string;
for (size_t i = 0; i < size; ++i)
{
const String & str_to = to[i].get<const String &>();
StringRef ref{string_pool.insert(str_to.data(), str_to.size() + 1), str_to.size() + 1};
table[from[i].get<UInt64>()] = ref;
}
}
else if (from[0].getType() == Field::Types::String && to[0].getType() != Field::Types::String)
{
table_string_to_num = std::make_unique<StringToNum>();
auto & table = *table_string_to_num;
for (size_t i = 0; i < size; ++i)
{
const String & str_from = from[i].get<const String &>();
StringRef ref{string_pool.insert(str_from.data(), str_from.size() + 1), str_from.size() + 1};
table[ref] = (*used_to)[i].get<UInt64>();
}
}
else if (from[0].getType() == Field::Types::String && to[0].getType() == Field::Types::String)
{
table_string_to_string = std::make_unique<StringToString>();
auto & table = *table_string_to_string;
for (size_t i = 0; i < size; ++i)
{
const String & str_from = from[i].get<const String &>();
const String & str_to = to[i].get<const String &>();
StringRef ref_from{string_pool.insert(str_from.data(), str_from.size() + 1), str_from.size() + 1};
StringRef ref_to{string_pool.insert(str_to.data(), str_to.size() + 1), str_to.size() + 1};
table[ref_from] = ref_to;
}
}
prepared = true;
}
};
}