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811 lines
32 KiB
C++
811 lines
32 KiB
C++
#pragma once
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#include <mutex>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/DataTypes/DataTypeArray.h>
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#include <DB/Columns/ColumnString.h>
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#include <DB/Columns/ColumnConst.h>
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#include <DB/Columns/ColumnVector.h>
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#include <DB/Common/Arena.h>
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#include <DB/Core/StringRef.h>
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#include <DB/Common/HashTable/HashMap.h>
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#include <DB/Functions/IFunction.h>
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namespace DB
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{
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/** transform(x, from_array, to_array[, default]) - преобразовать x согласно переданному явным образом соответствию.
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*/
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DataTypePtr getSmallestCommonNumericType(const IDataType & t1, const IDataType & t2);
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/** transform(x, [from...], [to...], default)
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* - преобразует значения согласно явно указанному отображению.
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*
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* x - что преобразовывать.
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* from - константный массив значений для преобразования.
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* to - константный массив значений, в которые должны быть преобразованы значения из from.
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* default - какое значение использовать, если x не равен ни одному из значений во from.
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* from и to - массивы одинаковых размеров.
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*
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* Типы:
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* transform(T, Array(T), Array(U), U) -> U
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*
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* transform(x, [from...], [to...])
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* - eсли default не указан, то для значений x, для которых нет соответствующего элемента во from, возвращается не изменённое значение x.
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*
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* Типы:
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* transform(T, Array(T), Array(T)) -> T
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*
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* Замечание: реализация довольно громоздкая.
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*/
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class FunctionTransform : public IFunction
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{
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public:
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static constexpr auto name = "transform";
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static IFunction * create(const Context &) { return new FunctionTransform; }
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String getName() const override { return name; }
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DataTypePtr getReturnType(const DataTypes & arguments) const override
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{
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const auto args_size = arguments.size();
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if (args_size != 3 && args_size != 4)
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throw Exception{
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"Number of arguments for function " + getName() + " doesn't match: passed " +
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toString(args_size) + ", should be 3 or 4",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH};
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const IDataType * type_x = arguments[0].get();
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if (!type_x->isNumeric() && !typeid_cast<const DataTypeString *>(type_x))
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throw Exception("Unsupported type " + type_x->getName()
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+ " of first argument of function " + getName()
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+ ", must be numeric type or Date/DateTime or String", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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const DataTypeArray * type_arr_from = typeid_cast<const DataTypeArray *>(arguments[1].get());
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if (!type_arr_from)
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throw Exception("Second argument of function " + getName()
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+ ", must be array of source values to transform from.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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const auto type_arr_from_nested = type_arr_from->getNestedType();
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if ((type_x->isNumeric() != type_arr_from_nested->isNumeric())
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|| (!!typeid_cast<const DataTypeString *>(type_x) != !!typeid_cast<const DataTypeString *>(type_arr_from_nested.get())))
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throw Exception("First argument and elements of array of second argument of function " + getName()
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+ " must have compatible types: both numeric or both strings.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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const DataTypeArray * type_arr_to = typeid_cast<const DataTypeArray *>(arguments[2].get());
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if (!type_arr_to)
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throw Exception("Third argument of function " + getName()
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+ ", must be array of destination values to transform to.", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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const auto type_arr_to_nested = type_arr_to->getNestedType();
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if (args_size == 3)
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{
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if ((type_x->isNumeric() != type_arr_to_nested->isNumeric())
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|| (!!typeid_cast<const DataTypeString *>(type_x) != !!typeid_cast<const DataTypeString *>(type_arr_to_nested.get())))
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throw Exception("Function " + getName()
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+ " have signature: transform(T, Array(T), Array(U), U) -> U; or transform(T, Array(T), Array(T)) -> T; where T and U are types.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return type_x->clone();
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}
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else
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{
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const IDataType * type_default = arguments[3].get();
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if (!type_default->isNumeric() && !typeid_cast<const DataTypeString *>(type_default))
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throw Exception("Unsupported type " + type_default->getName()
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+ " of fourth argument (default value) of function " + getName()
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+ ", must be numeric type or Date/DateTime or String", ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if ((type_default->isNumeric() != type_arr_to_nested->isNumeric())
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|| (!!typeid_cast<const DataTypeString *>(type_default) != !!typeid_cast<const DataTypeString *>(type_arr_to_nested.get())))
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throw Exception("Function " + getName()
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+ " have signature: transform(T, Array(T), Array(U), U) -> U; or transform(T, Array(T), Array(T)) -> T; where T and U are types.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (type_arr_to_nested->behavesAsNumber() && type_default->behavesAsNumber())
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{
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/// Берём наименьший общий тип для элементов массива значений to и для default-а.
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return getSmallestCommonNumericType(*type_arr_to_nested, *type_default);
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}
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/// TODO Больше проверок.
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return type_arr_to_nested->clone();
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}
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}
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void execute(Block & block, const ColumnNumbers & arguments, const size_t result) override
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{
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const ColumnConstArray * array_from = typeid_cast<const ColumnConstArray *>(&*block.getByPosition(arguments[1]).column);
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const ColumnConstArray * array_to = typeid_cast<const ColumnConstArray *>(&*block.getByPosition(arguments[2]).column);
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if (!array_from && !array_to)
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throw Exception("Second and third arguments of function " + getName() + " must be constant arrays.", ErrorCodes::ILLEGAL_COLUMN);
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prepare(array_from->getData(), array_to->getData(), block, arguments);
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const auto in = block.getByPosition(arguments.front()).column.get();
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if (in->isConst())
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{
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executeConst(block, arguments, result);
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return;
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}
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const IColumn * default_column = nullptr;
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if (arguments.size() == 4)
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default_column = block.getByPosition(arguments[3]).column.get();
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auto column_result = block.getByPosition(result).type->createColumn();
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auto out = column_result.get();
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if (!executeNum<UInt8>(in, out, default_column)
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&& !executeNum<UInt16>(in, out, default_column)
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&& !executeNum<UInt32>(in, out, default_column)
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&& !executeNum<UInt64>(in, out, default_column)
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&& !executeNum<Int8>(in, out, default_column)
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&& !executeNum<Int16>(in, out, default_column)
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&& !executeNum<Int32>(in, out, default_column)
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&& !executeNum<Int64>(in, out, default_column)
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&& !executeNum<Float32>(in, out, default_column)
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&& !executeNum<Float64>(in, out, default_column)
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&& !executeString(in, out, default_column))
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throw Exception(
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"Illegal column " + in->getName() + " of first argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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block.getByPosition(result).column = column_result;
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}
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private:
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void executeConst(Block & block, const ColumnNumbers & arguments, const size_t result)
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{
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/// Составим блок из полноценных столбцов размера 1 и вычислим функцию как обычно.
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Block tmp_block;
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ColumnNumbers tmp_arguments;
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tmp_block.insert(block.getByPosition(arguments[0]));
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tmp_block.getByPosition(0).column = static_cast<IColumnConst *>(tmp_block.getByPosition(0).column->cloneResized(1).get())->convertToFullColumn();
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tmp_arguments.push_back(0);
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for (size_t i = 1; i < arguments.size(); ++i)
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{
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tmp_block.insert(block.getByPosition(arguments[i]));
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tmp_arguments.push_back(i);
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}
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tmp_block.insert(block.getByPosition(result));
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size_t tmp_result = arguments.size();
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execute(tmp_block, tmp_arguments, tmp_result);
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block.getByPosition(result).column = block.getByPosition(result).type->createConstColumn(
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block.rowsInFirstColumn(),
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(*tmp_block.getByPosition(tmp_result).column)[0]);
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}
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template <typename T>
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bool executeNum(const IColumn * in_untyped, IColumn * out_untyped, const IColumn * default_untyped)
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{
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if (const auto in = typeid_cast<const ColumnVector<T> *>(in_untyped))
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{
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if (!default_untyped)
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{
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auto out = typeid_cast<ColumnVector<T> *>(out_untyped);
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if (!out)
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throw Exception(
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"Illegal column " + out_untyped->getName() + " of elements of array of third argument of function " + getName()
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+ ", must be " + in->getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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executeImplNumToNum<T>(in->getData(), out->getData());
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}
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else if (default_untyped->isConst())
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{
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if (!executeNumToNumWithConstDefault<T, UInt8>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, UInt16>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, UInt32>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, UInt64>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, Int8>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, Int16>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, Int32>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, Int64>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, Float32>(in, out_untyped)
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&& !executeNumToNumWithConstDefault<T, Float64>(in, out_untyped)
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&& !executeNumToStringWithConstDefault<T>(in, out_untyped))
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throw Exception(
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"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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else
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{
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if (!executeNumToNumWithNonConstDefault<T, UInt8>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, UInt16>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, UInt32>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, UInt64>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, Int8>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, Int16>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, Int32>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, Int64>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, Float32>(in, out_untyped, default_untyped)
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&& !executeNumToNumWithNonConstDefault<T, Float64>(in, out_untyped, default_untyped)
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&& !executeNumToStringWithNonConstDefault<T>(in, out_untyped, default_untyped))
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throw Exception(
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"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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return true;
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}
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return false;
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}
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bool executeString(const IColumn * in_untyped, IColumn * out_untyped, const IColumn * default_untyped)
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{
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if (const auto in = typeid_cast<const ColumnString *>(in_untyped))
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{
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if (!default_untyped)
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{
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if (!executeStringToString(in, out_untyped))
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throw Exception(
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"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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else if (default_untyped->isConst())
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{
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if (!executeStringToNumWithConstDefault<UInt8>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<UInt16>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<UInt32>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<UInt64>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<Int8>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<Int16>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<Int32>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<Int64>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<Float32>(in, out_untyped)
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&& !executeStringToNumWithConstDefault<Float64>(in, out_untyped)
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&& !executeStringToStringWithConstDefault(in, out_untyped))
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throw Exception(
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"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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else
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{
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if (!executeStringToNumWithNonConstDefault<UInt8>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<UInt16>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<UInt32>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<UInt64>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<Int8>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<Int16>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<Int32>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<Int64>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<Float32>(in, out_untyped, default_untyped)
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&& !executeStringToNumWithNonConstDefault<Float64>(in, out_untyped, default_untyped)
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&& !executeStringToStringWithNonConstDefault(in, out_untyped, default_untyped))
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throw Exception(
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"Illegal column " + in->getName() + " of elements of array of second argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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return true;
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}
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return false;
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}
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template <typename T, typename U>
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bool executeNumToNumWithConstDefault(const ColumnVector<T> * in, IColumn * out_untyped)
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{
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auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
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if (!out)
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return false;
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executeImplNumToNumWithConstDefault<T, U>(in->getData(), out->getData(), const_default_value.get<U>());
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return true;
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}
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template <typename T, typename U>
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bool executeNumToNumWithNonConstDefault(const ColumnVector<T> * in, IColumn * out_untyped, const IColumn * default_untyped)
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{
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auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
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if (!out)
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return false;
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if (!executeNumToNumWithNonConstDefault2<T, U, UInt8>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, UInt16>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, UInt32>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, UInt64>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, Int8>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, Int16>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, Int32>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, Int64>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, Float32>(in, out, default_untyped)
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&& !executeNumToNumWithNonConstDefault2<T, U, Float64>(in, out, default_untyped))
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throw Exception(
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"Illegal column " + default_untyped->getName() + " of fourth argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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return true;
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}
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template <typename T, typename U, typename V>
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bool executeNumToNumWithNonConstDefault2(const ColumnVector<T> * in, ColumnVector<U> * out, const IColumn * default_untyped)
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{
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auto col_default = typeid_cast<const ColumnVector<V> *>(default_untyped);
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if (!col_default)
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return false;
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executeImplNumToNumWithNonConstDefault<T, U, V>(in->getData(), out->getData(), col_default->getData());
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return true;
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}
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template <typename T>
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bool executeNumToStringWithConstDefault(const ColumnVector<T> * in, IColumn * out_untyped)
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{
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auto out = typeid_cast<ColumnString *>(out_untyped);
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if (!out)
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return false;
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const String & default_str = const_default_value.get<const String &>();
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StringRef default_string_ref{default_str.data(), default_str.size() + 1};
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executeImplNumToStringWithConstDefault<T>(in->getData(), out->getChars(), out->getOffsets(), default_string_ref);
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return true;
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}
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template <typename T>
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bool executeNumToStringWithNonConstDefault(const ColumnVector<T> * in, IColumn * out_untyped, const IColumn * default_untyped)
|
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{
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auto out = typeid_cast<ColumnString *>(out_untyped);
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if (!out)
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return false;
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auto default_col = typeid_cast<const ColumnString *>(default_untyped);
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if (!default_col)
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throw Exception("Illegal column " + default_untyped->getName() + " of fourth argument of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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|
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executeImplNumToStringWithNonConstDefault<T>(
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in->getData(),
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out->getChars(), out->getOffsets(),
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default_col->getChars(), default_col->getOffsets());
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return true;
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}
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template <typename U>
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bool executeStringToNumWithConstDefault(const ColumnString * in, IColumn * out_untyped)
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{
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auto out = typeid_cast<ColumnVector<U> *>(out_untyped);
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if (!out)
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return false;
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executeImplStringToNumWithConstDefault<U>(in->getChars(), in->getOffsets(), out->getData(), const_default_value.get<U>());
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return true;
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}
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|
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template <typename U>
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bool executeStringToNumWithNonConstDefault(const ColumnString * in, IColumn * out_untyped, const IColumn * default_untyped)
|
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{
|
||
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 PODArray<T> & src, PODArray<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 PODArray<T> & src, PODArray<U> & dst, const PODArray<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 PODArray<T> & src, PODArray<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 PODArray<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 PODArray<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,
|
||
PODArray<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,
|
||
PODArray<U> & dst, const PODArray<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.getByPosition(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] = apply_visitor(FieldVisitorConvertToNumber<Float64>(), to[i]);
|
||
used_to = &converted_to;
|
||
}
|
||
else if (!default_col_is_float && to_is_float)
|
||
{
|
||
if (const_default_col)
|
||
const_default_value = apply_visitor(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.reset(new 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.reset(new 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.reset(new 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.reset(new 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;
|
||
}
|
||
};
|
||
|
||
}
|