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https://github.com/ClickHouse/ClickHouse.git
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349 lines
11 KiB
C++
349 lines
11 KiB
C++
#pragma once
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <DB/Columns/ColumnVector.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/ColumnArray.h>
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#include <DB/Functions/IFunction.h>
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namespace DB
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{
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/** Функция выбора по условию: if(cond, then, else).
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* cond - UInt8
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* then, else - одинакового типа - либо числа/даты/даты-с-временем, либо строки.
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*/
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template <typename T>
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struct NumIfImpl
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{
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static void vector_vector(
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const std::vector<UInt8> & cond,
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const std::vector<T> & a, const std::vector<T> & b,
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std::vector<T> & res)
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{
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size_t size = cond.size();
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for (size_t i = 0; i < size; ++i)
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res[i] = cond[i] ? a[i] : b[i];
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}
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static void vector_constant(
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const std::vector<UInt8> & cond,
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const std::vector<T> & a, T b,
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std::vector<T> & res)
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{
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size_t size = cond.size();
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for (size_t i = 0; i < size; ++i)
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res[i] = cond[i] ? a[i] : b;
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}
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static void constant_vector(
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const std::vector<UInt8> & cond,
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T a, const std::vector<T> & b,
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std::vector<T> & res)
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{
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size_t size = cond.size();
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for (size_t i = 0; i < size; ++i)
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res[i] = cond[i] ? a : b[i];
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}
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static void constant_constant(
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const std::vector<UInt8> & cond,
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T a, T b,
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std::vector<T> & res)
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{
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size_t size = cond.size();
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for (size_t i = 0; i < size; ++i)
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res[i] = cond[i] ? a : b;
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}
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};
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struct StringIfImpl
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{
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static void vector_vector(
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const std::vector<UInt8> & cond,
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const std::vector<UInt8> & a_data, const ColumnString::Offsets_t & a_offsets,
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const std::vector<UInt8> & b_data, const ColumnString::Offsets_t & b_offsets,
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std::vector<UInt8> & c_data, ColumnString::Offsets_t & c_offsets)
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{
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size_t size = cond.size();
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c_offsets.resize(size);
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c_data.reserve(std::max(a_data.size(), b_data.size()));
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ColumnString::Offset_t a_prev_offset = 0;
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ColumnString::Offset_t b_prev_offset = 0;
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ColumnString::Offset_t c_prev_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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if (cond[i])
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{
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size_t size_to_write = a_offsets[i] - a_prev_offset;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], &a_data[a_prev_offset], size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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else
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{
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size_t size_to_write = b_offsets[i] - b_prev_offset;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], &b_data[b_prev_offset], size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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a_prev_offset = a_offsets[i];
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b_prev_offset = b_offsets[i];
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}
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}
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static void vector_constant(
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const std::vector<UInt8> & cond,
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const std::vector<UInt8> & a_data, const ColumnString::Offsets_t & a_offsets,
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const String & b,
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std::vector<UInt8> & c_data, ColumnString::Offsets_t & c_offsets)
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{
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size_t size = cond.size();
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c_offsets.resize(size);
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c_data.reserve(a_data.size());
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ColumnString::Offset_t a_prev_offset = 0;
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ColumnString::Offset_t c_prev_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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if (cond[i])
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{
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size_t size_to_write = a_offsets[i] - a_prev_offset;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], &a_data[a_prev_offset], size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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else
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{
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size_t size_to_write = b.size() + 1;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], b.data(), size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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a_prev_offset = a_offsets[i];
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}
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}
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static void constant_vector(
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const std::vector<UInt8> & cond,
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const String & a,
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const std::vector<UInt8> & b_data, const ColumnString::Offsets_t & b_offsets,
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std::vector<UInt8> & c_data, ColumnString::Offsets_t & c_offsets)
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{
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size_t size = cond.size();
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c_offsets.resize(size);
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c_data.reserve(b_data.size());
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ColumnString::Offset_t b_prev_offset = 0;
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ColumnString::Offset_t c_prev_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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if (cond[i])
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{
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size_t size_to_write = a.size() + 1;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], a.data(), size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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else
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{
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size_t size_to_write = b_offsets[i] - b_prev_offset;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], &b_data[b_prev_offset], size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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b_prev_offset = b_offsets[i];
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}
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}
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static void constant_constant(
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const std::vector<UInt8> & cond,
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const String & a, const String & b,
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std::vector<UInt8> & c_data, ColumnString::Offsets_t & c_offsets)
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{
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size_t size = cond.size();
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c_offsets.resize(size);
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c_data.reserve((std::max(a.size(), b.size()) + 1) * size);
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ColumnString::Offset_t c_prev_offset = 0;
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for (size_t i = 0; i < size; ++i)
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{
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if (cond[i])
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{
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size_t size_to_write = a.size() + 1;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], a.data(), size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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else
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{
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size_t size_to_write = b.size() + 1;
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c_data.resize(c_data.size() + size_to_write);
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memcpy(&c_data[c_prev_offset], b.data(), size_to_write);
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c_prev_offset += size_to_write;
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c_offsets[i] = c_prev_offset;
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}
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}
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}
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};
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class FunctionIf : public IFunction
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{
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private:
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template <typename T>
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bool executeType(const ColumnVector<UInt8> * cond_col, Block & block, const ColumnNumbers & arguments, size_t result)
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{
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ColumnVector<T> * col_then_vec = dynamic_cast<ColumnVector<T> *>(&*block.getByPosition(arguments[1]).column);
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ColumnVector<T> * col_else_vec = dynamic_cast<ColumnVector<T> *>(&*block.getByPosition(arguments[2]).column);
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ColumnConst<T> * col_then_const = dynamic_cast<ColumnConst<T> *>(&*block.getByPosition(arguments[1]).column);
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ColumnConst<T> * col_else_const = dynamic_cast<ColumnConst<T> *>(&*block.getByPosition(arguments[2]).column);
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ColumnVector<T> * col_res = new ColumnVector<T>;
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block.getByPosition(result).column = col_res;
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typename ColumnVector<T>::Container_t & vec_res = col_res->getData();
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vec_res.resize(block.getByPosition(arguments[0]).column->size());
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if (col_then_vec && col_else_vec)
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NumIfImpl<T>::vector_vector(cond_col->getData(), col_then_vec->getData(), col_else_vec->getData(), vec_res);
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else if (col_then_vec && col_else_const)
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NumIfImpl<T>::vector_constant(cond_col->getData(), col_then_vec->getData(), col_else_const->getData(), vec_res);
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else if (col_then_const && col_else_vec)
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NumIfImpl<T>::constant_vector(cond_col->getData(), col_then_const->getData(), col_else_vec->getData(), vec_res);
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else if (col_then_const && col_else_const)
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NumIfImpl<T>::constant_constant(cond_col->getData(), col_then_const->getData(), col_else_const->getData(), vec_res);
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else
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return false;
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return true;
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}
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bool executeString(const ColumnVector<UInt8> * cond_col, Block & block, const ColumnNumbers & arguments, size_t result)
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{
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ColumnString * col_then = dynamic_cast<ColumnString *>(&*block.getByPosition(arguments[1]).column);
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ColumnString * col_else = dynamic_cast<ColumnString *>(&*block.getByPosition(arguments[2]).column);
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ColumnConstString * col_then_const = dynamic_cast<ColumnConstString *>(&*block.getByPosition(arguments[1]).column);
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ColumnConstString * col_else_const = dynamic_cast<ColumnConstString *>(&*block.getByPosition(arguments[2]).column);
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ColumnString * col_res = new ColumnString;
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block.getByPosition(result).column = col_res;
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ColumnString::Chars_t & res_vec = col_res->getChars();
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ColumnString::Offsets_t & res_offsets = col_res->getOffsets();
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if (col_then && col_else)
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StringIfImpl::vector_vector(
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cond_col->getData(),
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col_then->getChars(), col_then->getOffsets(),
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col_else->getChars(), col_else->getOffsets(),
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res_vec, res_offsets);
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else if (col_then && col_else_const)
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StringIfImpl::vector_constant(
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cond_col->getData(),
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col_then->getChars(), col_then->getOffsets(),
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col_else_const->getData(),
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res_vec, res_offsets);
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else if (col_then_const && col_else)
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StringIfImpl::constant_vector(
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cond_col->getData(),
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col_then_const->getData(),
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col_else->getChars(), col_else->getOffsets(),
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res_vec, res_offsets);
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else if (col_then_const && col_else_const)
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StringIfImpl::constant_constant(
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cond_col->getData(),
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col_then_const->getData(),
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col_else_const->getData(),
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res_vec, res_offsets);
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else
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return false;
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return true;
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}
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public:
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/// Получить имя функции.
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String getName() const
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{
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return "if";
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}
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/// Получить тип результата по типам аргументов. Если функция неприменима для данных аргументов - кинуть исключение.
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DataTypePtr getReturnType(const DataTypes & arguments) const
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{
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if (arguments.size() != 3)
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throw Exception("Number of arguments for function " + getName() + " doesn't match: passed "
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+ toString(arguments.size()) + ", should be 3.",
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ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH);
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if (!dynamic_cast<const DataTypeUInt8 *>(&*arguments[0]))
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throw Exception("Illegal type of first argument (condition) of function if. Must be UInt8.",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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if (arguments[1]->getName() != arguments[2]->getName())
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throw Exception("Second and third arguments for function " + getName() + " must have same type. Passed: "
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+ arguments[1]->getName() + " and " + arguments[2]->getName() + ".",
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ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT);
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return arguments[1];
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}
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/// Выполнить функцию над блоком.
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void execute(Block & block, const ColumnNumbers & arguments, size_t result)
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{
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const ColumnVector<UInt8> * cond_col = dynamic_cast<const ColumnVector<UInt8> *>(&*block.getByPosition(arguments[0]).column);
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const ColumnConst<UInt8> * cond_const_col = dynamic_cast<const ColumnConst<UInt8> *>(&*block.getByPosition(arguments[0]).column);
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if (cond_const_col)
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{
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block.getByPosition(result).column = cond_const_col->getData()
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? block.getByPosition(arguments[1]).column
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: block.getByPosition(arguments[2]).column;
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}
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else if (cond_col)
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{
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if (!( executeType<UInt8>(cond_col, block, arguments, result)
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|| executeType<UInt16>(cond_col, block, arguments, result)
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|| executeType<UInt32>(cond_col, block, arguments, result)
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|| executeType<UInt64>(cond_col, block, arguments, result)
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|| executeType<Int8>(cond_col, block, arguments, result)
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|| executeType<Int16>(cond_col, block, arguments, result)
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|| executeType<Int32>(cond_col, block, arguments, result)
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|| executeType<Int64>(cond_col, block, arguments, result)
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|| executeType<Float32>(cond_col, block, arguments, result)
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|| executeType<Float64>(cond_col, block, arguments, result)
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|| executeString(cond_col, block, arguments, result)))
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throw Exception("Illegal columns " + block.getByPosition(arguments[1]).column->getName()
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+ " and " + block.getByPosition(arguments[2]).column->getName()
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+ " of second (then) and third (else) arguments of function " + getName(),
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ErrorCodes::ILLEGAL_COLUMN);
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}
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else
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throw Exception("Illegal column " + cond_col->getName() + " of first argument of function " + getName() + ". Must be ColumnUInt8 or ColumnConstUInt8.",
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ErrorCodes::ILLEGAL_COLUMN);
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}
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};
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}
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