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https://github.com/ClickHouse/ClickHouse.git
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474 lines
12 KiB
C++
474 lines
12 KiB
C++
#pragma once
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#include <string.h>
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#include <DB/Core/Defines.h>
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#include <DB/Columns/IColumn.h>
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#include <DB/Columns/ColumnsCommon.h>
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#include <DB/Common/PODArray.h>
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#include <DB/Common/Arena.h>
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#include <DB/Common/SipHash.h>
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#include <DB/Common/memcpySmall.h>
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class Collator;
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int PARAMETER_OUT_OF_BOUND;
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extern const int SIZES_OF_COLUMNS_DOESNT_MATCH;
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}
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/** A column of values of type `String`.
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*/
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class ColumnString final : public IColumn
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{
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public:
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using Chars_t = PaddedPODArray<UInt8>;
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private:
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/// On the index i there is an offset to the beginning of the i + 1 -th element.
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Offsets_t offsets;
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/// Bytes of rows laid in succession. Strings are stored with the trailing zero byte.
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Chars_t chars;
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size_t __attribute__((__always_inline__)) offsetAt(size_t i) const { return i == 0 ? 0 : offsets[i - 1]; }
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/// Size, including the trailing zero byte.
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size_t __attribute__((__always_inline__)) sizeAt(size_t i) const { return i == 0 ? offsets[0] : (offsets[i] - offsets[i - 1]); }
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template <bool positive>
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friend struct lessWithCollation;
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public:
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/** Create an empty column of rows */
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ColumnString() {}
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std::string getName() const override { return "ColumnString"; }
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size_t size() const override
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{
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return offsets.size();
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}
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size_t byteSize() const override
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{
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return chars.size() + offsets.size() * sizeof(offsets[0]);
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}
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size_t allocatedSize() const override
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{
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return chars.allocated_size() + offsets.allocated_size() * sizeof(offsets[0]);
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}
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ColumnPtr cloneResized(size_t size) const override
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{
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ColumnPtr new_col_holder = std::make_shared<ColumnString>();
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if (size > 0)
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{
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auto & new_col = static_cast<ColumnString &>(*new_col_holder);
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size_t count = std::min(this->size(), size);
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/// First create the offsets.
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new_col.offsets.resize(size);
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new_col.offsets.assign(offsets.begin(), offsets.begin() + count);
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size_t byte_count = new_col.offsets.back();
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if (size > count)
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{
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/// Create offsets for the (size - count) new empty strings.
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for (size_t i = count; i < size; ++i)
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new_col.offsets[i] = new_col.offsets[i - 1] + 1;
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}
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/// Then store the strings.
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new_col.chars.resize(new_col.offsets.back());
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new_col.chars.assign(chars.begin(), chars.begin() + byte_count);
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if (size > count)
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{
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/// Create (size - count) empty strings.
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size_t from = new_col.offsets[count];
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size_t n = new_col.offsets.back() - from;
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memset(&new_col.chars[from], '\0', n);
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}
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}
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return new_col_holder;
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}
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Field operator[](size_t n) const override
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{
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return Field(&chars[offsetAt(n)], sizeAt(n) - 1);
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}
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void get(size_t n, Field & res) const override
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{
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res.assignString(&chars[offsetAt(n)], sizeAt(n) - 1);
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}
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StringRef getDataAt(size_t n) const override
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{
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return StringRef(&chars[offsetAt(n)], sizeAt(n) - 1);
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}
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StringRef getDataAtWithTerminatingZero(size_t n) const override
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{
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return StringRef(&chars[offsetAt(n)], sizeAt(n));
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}
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void insert(const Field & x) override
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{
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const String & s = DB::get<const String &>(x);
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const size_t old_size = chars.size();
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const size_t size_to_append = s.size() + 1;
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const size_t new_size = old_size + size_to_append;
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chars.resize(new_size);
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memcpy(&chars[old_size], s.c_str(), size_to_append);
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offsets.push_back(new_size);
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}
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void insertFrom(const IColumn & src_, size_t n) override
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{
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const ColumnString & src = static_cast<const ColumnString &>(src_);
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if (n != 0)
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{
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const size_t size_to_append = src.offsets[n] - src.offsets[n - 1];
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if (size_to_append == 1)
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{
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/// shortcut for empty string
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chars.push_back(0);
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offsets.push_back(chars.size());
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}
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else
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{
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const size_t old_size = chars.size();
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const size_t offset = src.offsets[n - 1];
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const size_t new_size = old_size + size_to_append;
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chars.resize(new_size);
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memcpySmallAllowReadWriteOverflow15(&chars[old_size], &src.chars[offset], size_to_append);
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offsets.push_back(new_size);
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}
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}
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else
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{
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const size_t old_size = chars.size();
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const size_t size_to_append = src.offsets[0];
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const size_t new_size = old_size + size_to_append;
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chars.resize(new_size);
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memcpySmallAllowReadWriteOverflow15(&chars[old_size], &src.chars[0], size_to_append);
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offsets.push_back(new_size);
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}
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}
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void insertData(const char * pos, size_t length) override
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{
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const size_t old_size = chars.size();
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const size_t new_size = old_size + length + 1;
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chars.resize(new_size);
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memcpy(&chars[old_size], pos, length);
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chars[old_size + length] = 0;
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offsets.push_back(new_size);
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}
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void insertDataWithTerminatingZero(const char * pos, size_t length) override
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{
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const size_t old_size = chars.size();
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const size_t new_size = old_size + length;
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chars.resize(new_size);
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memcpy(&chars[old_size], pos, length);
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offsets.push_back(new_size);
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}
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void popBack(size_t n) override
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{
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size_t nested_n = offsets.back() - offsetAt(offsets.size() - n);
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chars.resize(chars.size() - nested_n);
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offsets.resize_assume_reserved(offsets.size() - n);
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}
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StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override
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{
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size_t string_size = sizeAt(n);
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size_t offset = offsetAt(n);
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StringRef res;
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res.size = sizeof(string_size) + string_size;
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char * pos = arena.allocContinue(res.size, begin);
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memcpy(pos, &string_size, sizeof(string_size));
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memcpy(pos + sizeof(string_size), &chars[offset], string_size);
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res.data = pos;
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return res;
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}
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const char * deserializeAndInsertFromArena(const char * pos) override
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{
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const size_t string_size = *reinterpret_cast<const size_t *>(pos);
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pos += sizeof(string_size);
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const size_t old_size = chars.size();
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const size_t new_size = old_size + string_size;
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chars.resize(new_size);
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memcpy(&chars[old_size], pos, string_size);
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offsets.push_back(new_size);
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return pos + string_size;
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}
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void updateHashWithValue(size_t n, SipHash & hash) const override
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{
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size_t string_size = sizeAt(n);
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size_t offset = offsetAt(n);
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hash.update(reinterpret_cast<const char *>(&string_size), sizeof(string_size));
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hash.update(reinterpret_cast<const char *>(&chars[offset]), string_size);
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}
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void insertRangeFrom(const IColumn & src, size_t start, size_t length) override
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{
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if (length == 0)
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return;
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const ColumnString & src_concrete = static_cast<const ColumnString &>(src);
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if (start + length > src_concrete.offsets.size())
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throw Exception("Parameter out of bound in IColumnString::insertRangeFrom method.",
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ErrorCodes::PARAMETER_OUT_OF_BOUND);
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size_t nested_offset = src_concrete.offsetAt(start);
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size_t nested_length = src_concrete.offsets[start + length - 1] - nested_offset;
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size_t old_chars_size = chars.size();
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chars.resize(old_chars_size + nested_length);
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memcpy(&chars[old_chars_size], &src_concrete.chars[nested_offset], nested_length);
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if (start == 0 && offsets.empty())
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{
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offsets.assign(src_concrete.offsets.begin(), src_concrete.offsets.begin() + length);
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}
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else
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{
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size_t old_size = offsets.size();
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size_t prev_max_offset = old_size ? offsets.back() : 0;
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offsets.resize(old_size + length);
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for (size_t i = 0; i < length; ++i)
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offsets[old_size + i] = src_concrete.offsets[start + i] - nested_offset + prev_max_offset;
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}
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}
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ColumnPtr filter(const Filter & filt, ssize_t result_size_hint) const override
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{
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if (offsets.size() == 0)
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return std::make_shared<ColumnString>();
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auto res = std::make_shared<ColumnString>();
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Chars_t & res_chars = res->chars;
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Offsets_t & res_offsets = res->offsets;
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filterArraysImpl<UInt8>(chars, offsets, res_chars, res_offsets, filt, result_size_hint);
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return res;
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}
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ColumnPtr permute(const Permutation & perm, size_t limit) const override
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{
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size_t size = offsets.size();
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if (limit == 0)
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limit = size;
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else
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limit = std::min(size, limit);
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if (perm.size() < limit)
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throw Exception("Size of permutation is less than required.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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if (limit == 0)
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return std::make_shared<ColumnString>();
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std::shared_ptr<ColumnString> res = std::make_shared<ColumnString>();
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Chars_t & res_chars = res->chars;
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Offsets_t & res_offsets = res->offsets;
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if (limit == size)
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res_chars.resize(chars.size());
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else
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{
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size_t new_chars_size = 0;
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for (size_t i = 0; i < limit; ++i)
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new_chars_size += sizeAt(perm[i]);
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res_chars.resize(new_chars_size);
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}
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res_offsets.resize(limit);
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Offset_t current_new_offset = 0;
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for (size_t i = 0; i < limit; ++i)
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{
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size_t j = perm[i];
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size_t string_offset = j == 0 ? 0 : offsets[j - 1];
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size_t string_size = offsets[j] - string_offset;
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memcpySmallAllowReadWriteOverflow15(&res_chars[current_new_offset], &chars[string_offset], string_size);
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current_new_offset += string_size;
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res_offsets[i] = current_new_offset;
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}
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return res;
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}
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void insertDefault() override
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{
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chars.push_back(0);
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offsets.push_back(offsets.size() == 0 ? 1 : (offsets.back() + 1));
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}
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int compareAt(size_t n, size_t m, const IColumn & rhs_, int nan_direction_hint) const override
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{
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const ColumnString & rhs = static_cast<const ColumnString &>(rhs_);
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/** For performance, the strings are compared to the first zero byte.
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* (if zero byte is in the middle of the line, then what is after it is ignored)
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* Note that the terminating zero byte is always present.
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*/
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return strcmp(
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reinterpret_cast<const char *>(&chars[offsetAt(n)]),
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reinterpret_cast<const char *>(&rhs.chars[rhs.offsetAt(m)]));
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}
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/// Version `compareAt` for locale-sensitive string comparison
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int compareAtWithCollation(size_t n, size_t m, const IColumn & rhs_, const Collator & collator) const;
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template <bool positive>
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struct less
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{
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const ColumnString & parent;
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less(const ColumnString & parent_) : parent(parent_) {}
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bool operator()(size_t lhs, size_t rhs) const
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{
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int res = strcmp(
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reinterpret_cast<const char *>(&parent.chars[parent.offsetAt(lhs)]),
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reinterpret_cast<const char *>(&parent.chars[parent.offsetAt(rhs)]));
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return positive ? (res < 0) : (res > 0);
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}
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};
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void getPermutation(bool reverse, size_t limit, Permutation & res) const override
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{
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size_t s = offsets.size();
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res.resize(s);
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for (size_t i = 0; i < s; ++i)
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res[i] = i;
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if (limit >= s)
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limit = 0;
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if (limit)
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{
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if (reverse)
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std::partial_sort(res.begin(), res.begin() + limit, res.end(), less<false>(*this));
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else
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std::partial_sort(res.begin(), res.begin() + limit, res.end(), less<true>(*this));
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}
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else
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{
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if (reverse)
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std::sort(res.begin(), res.end(), less<false>(*this));
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else
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std::sort(res.begin(), res.end(), less<true>(*this));
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}
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}
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/// Sorting with regard to `Collation`
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void getPermutationWithCollation(const Collator & collator, bool reverse, size_t limit, Permutation & res) const;
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ColumnPtr replicate(const Offsets_t & replicate_offsets) const override
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{
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size_t col_size = size();
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if (col_size != replicate_offsets.size())
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throw Exception("Size of offsets doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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std::shared_ptr<ColumnString> res = std::make_shared<ColumnString>();
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if (0 == col_size)
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return res;
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Chars_t & res_chars = res->chars;
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Offsets_t & res_offsets = res->offsets;
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res_chars.reserve(chars.size() / col_size * replicate_offsets.back());
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res_offsets.reserve(replicate_offsets.back());
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Offset_t prev_replicate_offset = 0;
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Offset_t prev_string_offset = 0;
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Offset_t current_new_offset = 0;
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for (size_t i = 0; i < col_size; ++i)
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{
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size_t size_to_replicate = replicate_offsets[i] - prev_replicate_offset;
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size_t string_size = offsets[i] - prev_string_offset;
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for (size_t j = 0; j < size_to_replicate; ++j)
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{
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current_new_offset += string_size;
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res_offsets.push_back(current_new_offset);
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res_chars.resize(res_chars.size() + string_size);
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memcpySmallAllowReadWriteOverflow15(
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&res_chars[res_chars.size() - string_size], &chars[prev_string_offset], string_size);
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}
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prev_replicate_offset = replicate_offsets[i];
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prev_string_offset = offsets[i];
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}
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return res;
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}
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Columns scatter(ColumnIndex num_columns, const Selector & selector) const override
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{
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return scatterImpl<ColumnString>(num_columns, selector);
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}
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void reserve(size_t n) override
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{
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offsets.reserve(n);
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chars.reserve(n * DBMS_APPROX_STRING_SIZE);
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}
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Chars_t & getChars() { return chars; }
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const Chars_t & getChars() const { return chars; }
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Offsets_t & getOffsets() { return offsets; }
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const Offsets_t & getOffsets() const { return offsets; }
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void getExtremes(Field & min, Field & max) const override
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{
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min = String();
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max = String();
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}
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};
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}
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