mirror of
https://github.com/ClickHouse/ClickHouse.git
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219 lines
6.0 KiB
C++
219 lines
6.0 KiB
C++
#include <Poco/SharedPtr.h>
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#include <DB/Core/Defines.h>
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#include <DB/Columns/ColumnString.h>
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#include <DB/Columns/ColumnsNumber.h>
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#include <DB/Columns/ColumnConst.h>
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#include <DB/DataTypes/DataTypeString.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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#include <DB/IO/VarInt.h>
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#include <emmintrin.h>
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namespace DB
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{
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using Poco::SharedPtr;
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void DataTypeString::serializeBinary(const Field & field, WriteBuffer & ostr) const
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{
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const String & s = get<const String &>(field);
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writeVarUInt(s.size(), ostr);
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writeString(s, ostr);
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}
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void DataTypeString::deserializeBinary(Field & field, ReadBuffer & istr) const
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{
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UInt64 size;
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readVarUInt(size, istr);
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field = String();
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String & s = get<String &>(field);
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s.resize(size);
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istr.readStrict(&s[0], size);
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}
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void DataTypeString::serializeBinary(const IColumn & column, WriteBuffer & ostr, size_t offset, size_t limit) const
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{
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const ColumnString & column_string = typeid_cast<const ColumnString &>(column);
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const ColumnString::Chars_t & data = column_string.getChars();
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const ColumnString::Offsets_t & offsets = column_string.getOffsets();
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size_t size = column.size();
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if (!size)
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return;
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size_t end = limit && offset + limit < size
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? offset + limit
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: size;
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if (offset == 0)
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{
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UInt64 str_size = offsets[0] - 1;
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writeVarUInt(str_size, ostr);
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ostr.write(reinterpret_cast<const char *>(&data[0]), str_size);
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++offset;
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}
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for (size_t i = offset; i < end; ++i)
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{
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UInt64 str_size = offsets[i] - offsets[i - 1] - 1;
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writeVarUInt(str_size, ostr);
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ostr.write(reinterpret_cast<const char *>(&data[offsets[i - 1]]), str_size);
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}
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}
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template <int UNROLL_TIMES>
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static NO_INLINE void deserializeBinarySSE2(ColumnString::Chars_t & data, ColumnString::Offsets_t & offsets, ReadBuffer & istr, size_t limit)
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{
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size_t offset = data.size();
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for (size_t i = 0; i < limit; ++i)
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{
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if (istr.eof())
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break;
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UInt64 size;
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readVarUInt(size, istr);
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offset += size + 1;
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offsets.push_back(offset);
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data.resize(offset);
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if (size)
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{
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/// Оптимистичная ветка, в которой возможно более эффективное копирование.
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if (offset + 16 * UNROLL_TIMES <= data.capacity() && istr.position() + size + 16 * UNROLL_TIMES <= istr.buffer().end())
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{
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const __m128i * sse_src_pos = reinterpret_cast<const __m128i *>(istr.position());
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const __m128i * sse_src_end = sse_src_pos + (size + (16 * UNROLL_TIMES - 1)) / 16 / UNROLL_TIMES * UNROLL_TIMES;
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__m128i * sse_dst_pos = reinterpret_cast<__m128i *>(&data[offset - size - 1]);
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while (sse_src_pos < sse_src_end)
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{
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/// NOTE gcc 4.9.2 разворачивает цикл, но почему-то использует только один xmm регистр.
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///for (size_t j = 0; j < UNROLL_TIMES; ++j)
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/// _mm_storeu_si128(sse_dst_pos + j, _mm_loadu_si128(sse_src_pos + j));
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sse_src_pos += UNROLL_TIMES;
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sse_dst_pos += UNROLL_TIMES;
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if (UNROLL_TIMES >= 4) __asm__("movdqu %0, %%xmm0" :: "m"(sse_src_pos[-4]));
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if (UNROLL_TIMES >= 3) __asm__("movdqu %0, %%xmm1" :: "m"(sse_src_pos[-3]));
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if (UNROLL_TIMES >= 2) __asm__("movdqu %0, %%xmm2" :: "m"(sse_src_pos[-2]));
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if (UNROLL_TIMES >= 1) __asm__("movdqu %0, %%xmm3" :: "m"(sse_src_pos[-1]));
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if (UNROLL_TIMES >= 4) __asm__("movdqu %%xmm0, %0" : "=m"(sse_dst_pos[-4]));
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if (UNROLL_TIMES >= 3) __asm__("movdqu %%xmm1, %0" : "=m"(sse_dst_pos[-3]));
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if (UNROLL_TIMES >= 2) __asm__("movdqu %%xmm2, %0" : "=m"(sse_dst_pos[-2]));
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if (UNROLL_TIMES >= 1) __asm__("movdqu %%xmm3, %0" : "=m"(sse_dst_pos[-1]));
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}
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istr.position() += size;
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}
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else
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{
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istr.readStrict(reinterpret_cast<char*>(&data[offset - size - 1]), size);
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}
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}
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data[offset - 1] = 0;
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}
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}
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void DataTypeString::deserializeBinary(IColumn & column, ReadBuffer & istr, size_t limit, double avg_value_size_hint) const
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{
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ColumnString & column_string = typeid_cast<ColumnString &>(column);
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ColumnString::Chars_t & data = column_string.getChars();
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ColumnString::Offsets_t & offsets = column_string.getOffsets();
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/// Выбрано наугад.
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constexpr auto avg_value_size_hint_reserve_multiplier = 1.2;
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double avg_chars_size = (avg_value_size_hint && avg_value_size_hint > sizeof(offsets[0])
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? (avg_value_size_hint - sizeof(offsets[0])) * avg_value_size_hint_reserve_multiplier
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: DBMS_APPROX_STRING_SIZE);
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data.reserve(data.size() + std::ceil(limit * avg_chars_size));
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offsets.reserve(offsets.size() + limit);
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if (avg_chars_size >= 64)
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deserializeBinarySSE2<4>(data, offsets, istr, limit);
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else if (avg_chars_size >= 48)
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deserializeBinarySSE2<3>(data, offsets, istr, limit);
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else if (avg_chars_size >= 32)
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deserializeBinarySSE2<2>(data, offsets, istr, limit);
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else
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deserializeBinarySSE2<1>(data, offsets, istr, limit);
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}
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void DataTypeString::serializeText(const Field & field, WriteBuffer & ostr) const
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{
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writeString(get<const String &>(field), ostr);
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}
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void DataTypeString::deserializeText(Field & field, ReadBuffer & istr) const
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{
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field.assignString("", 0);
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readString(get<String &>(field), istr);
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}
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void DataTypeString::serializeTextEscaped(const Field & field, WriteBuffer & ostr) const
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{
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writeEscapedString(get<const String &>(field), ostr);
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}
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void DataTypeString::deserializeTextEscaped(Field & field, ReadBuffer & istr) const
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{
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field.assignString("", 0);
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readEscapedString(get<String &>(field), istr);
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}
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void DataTypeString::serializeTextQuoted(const Field & field, WriteBuffer & ostr) const
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{
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writeQuotedString(get<const String &>(field), ostr);
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}
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void DataTypeString::deserializeTextQuoted(Field & field, ReadBuffer & istr) const
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{
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field.assignString("", 0);
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readQuotedString(get<String &>(field), istr);
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}
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void DataTypeString::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
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{
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writeJSONString(get<const String &>(field), ostr);
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}
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ColumnPtr DataTypeString::createColumn() const
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{
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return new ColumnString;
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}
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ColumnPtr DataTypeString::createConstColumn(size_t size, const Field & field) const
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{
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return new ColumnConst<String>(size, get<const String &>(field));
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}
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}
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