mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-30 05:30:51 +00:00
262 lines
7.8 KiB
C++
262 lines
7.8 KiB
C++
#pragma once
|
|
|
|
#include <cstring>
|
|
#include <cassert>
|
|
|
|
#include <Columns/IColumn.h>
|
|
#include <Columns/IColumnImpl.h>
|
|
#include <Common/PODArray.h>
|
|
#include <Common/SipHash.h>
|
|
#include <Common/memcpySmall.h>
|
|
#include <Common/memcmpSmall.h>
|
|
#include <Common/assert_cast.h>
|
|
#include <Core/Field.h>
|
|
|
|
|
|
class Collator;
|
|
|
|
|
|
namespace DB
|
|
{
|
|
|
|
/** Column for String values.
|
|
*/
|
|
class ColumnString final : public COWHelper<IColumn, ColumnString>
|
|
{
|
|
public:
|
|
using Char = UInt8;
|
|
using Chars = PaddedPODArray<UInt8>;
|
|
|
|
private:
|
|
friend class COWHelper<IColumn, ColumnString>;
|
|
|
|
/// Maps i'th position to offset to i+1'th element. Last offset maps to the end of all chars (is the size of all chars).
|
|
Offsets offsets;
|
|
|
|
/// Bytes of strings, placed contiguously.
|
|
/// For convenience, every string ends with terminating zero byte. Note that strings could contain zero bytes in the middle.
|
|
Chars chars;
|
|
|
|
size_t ALWAYS_INLINE offsetAt(ssize_t i) const { return offsets[i - 1]; }
|
|
|
|
/// Size of i-th element, including terminating zero.
|
|
size_t ALWAYS_INLINE sizeAt(ssize_t i) const { return offsets[i] - offsets[i - 1]; }
|
|
|
|
template <bool positive>
|
|
struct less;
|
|
|
|
template <bool positive>
|
|
struct lessWithCollation;
|
|
|
|
ColumnString() = default;
|
|
|
|
ColumnString(const ColumnString & src)
|
|
: offsets(src.offsets.begin(), src.offsets.end()),
|
|
chars(src.chars.begin(), src.chars.end()) {}
|
|
|
|
public:
|
|
const char * getFamilyName() const override { return "String"; }
|
|
|
|
size_t size() const override
|
|
{
|
|
return offsets.size();
|
|
}
|
|
|
|
size_t byteSize() const override
|
|
{
|
|
return chars.size() + offsets.size() * sizeof(offsets[0]);
|
|
}
|
|
|
|
size_t allocatedBytes() const override
|
|
{
|
|
return chars.allocated_bytes() + offsets.allocated_bytes();
|
|
}
|
|
|
|
void protect() override;
|
|
|
|
MutableColumnPtr cloneResized(size_t to_size) const override;
|
|
|
|
Field operator[](size_t n) const override
|
|
{
|
|
assert(n < size());
|
|
return Field(&chars[offsetAt(n)], sizeAt(n) - 1);
|
|
}
|
|
|
|
void get(size_t n, Field & res) const override
|
|
{
|
|
assert(n < size());
|
|
res.assignString(&chars[offsetAt(n)], sizeAt(n) - 1);
|
|
}
|
|
|
|
StringRef getDataAt(size_t n) const override
|
|
{
|
|
assert(n < size());
|
|
return StringRef(&chars[offsetAt(n)], sizeAt(n) - 1);
|
|
}
|
|
|
|
StringRef getDataAtWithTerminatingZero(size_t n) const override
|
|
{
|
|
assert(n < size());
|
|
return StringRef(&chars[offsetAt(n)], sizeAt(n));
|
|
}
|
|
|
|
/// Suppress gcc 7.3.1 warning: '*((void*)&<anonymous> +8)' may be used uninitialized in this function
|
|
#if !__clang__
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
|
|
#endif
|
|
|
|
void insert(const Field & x) override
|
|
{
|
|
const String & s = DB::get<const String &>(x);
|
|
const size_t old_size = chars.size();
|
|
const size_t size_to_append = s.size() + 1;
|
|
const size_t new_size = old_size + size_to_append;
|
|
|
|
chars.resize(new_size);
|
|
memcpy(chars.data() + old_size, s.c_str(), size_to_append);
|
|
offsets.push_back(new_size);
|
|
}
|
|
|
|
#if !__clang__
|
|
#pragma GCC diagnostic pop
|
|
#endif
|
|
|
|
void insertFrom(const IColumn & src_, size_t n) override
|
|
{
|
|
const ColumnString & src = assert_cast<const ColumnString &>(src_);
|
|
const size_t size_to_append = src.offsets[n] - src.offsets[n - 1]; /// -1th index is Ok, see PaddedPODArray.
|
|
|
|
if (size_to_append == 1)
|
|
{
|
|
/// shortcut for empty string
|
|
chars.push_back(0);
|
|
offsets.push_back(chars.size());
|
|
}
|
|
else
|
|
{
|
|
const size_t old_size = chars.size();
|
|
const size_t offset = src.offsets[n - 1];
|
|
const size_t new_size = old_size + size_to_append;
|
|
|
|
chars.resize(new_size);
|
|
memcpySmallAllowReadWriteOverflow15(chars.data() + old_size, &src.chars[offset], size_to_append);
|
|
offsets.push_back(new_size);
|
|
}
|
|
}
|
|
|
|
void insertData(const char * pos, size_t length) override
|
|
{
|
|
const size_t old_size = chars.size();
|
|
const size_t new_size = old_size + length + 1;
|
|
|
|
chars.resize(new_size);
|
|
if (length)
|
|
memcpy(chars.data() + old_size, pos, length);
|
|
chars[old_size + length] = 0;
|
|
offsets.push_back(new_size);
|
|
}
|
|
|
|
/// Like getData, but inserting data should be zero-ending (i.e. length is 1 byte greater than real string size).
|
|
void insertDataWithTerminatingZero(const char * pos, size_t length)
|
|
{
|
|
const size_t old_size = chars.size();
|
|
const size_t new_size = old_size + length;
|
|
|
|
chars.resize(new_size);
|
|
memcpy(chars.data() + old_size, pos, length);
|
|
offsets.push_back(new_size);
|
|
}
|
|
|
|
void popBack(size_t n) override
|
|
{
|
|
size_t nested_n = offsets.back() - offsetAt(offsets.size() - n);
|
|
chars.resize(chars.size() - nested_n);
|
|
offsets.resize_assume_reserved(offsets.size() - n);
|
|
}
|
|
|
|
StringRef serializeValueIntoArena(size_t n, Arena & arena, char const *& begin) const override;
|
|
|
|
const char * deserializeAndInsertFromArena(const char * pos) override;
|
|
|
|
void updateHashWithValue(size_t n, SipHash & hash) const override
|
|
{
|
|
size_t string_size = sizeAt(n);
|
|
size_t offset = offsetAt(n);
|
|
|
|
hash.update(reinterpret_cast<const char *>(&string_size), sizeof(string_size));
|
|
hash.update(reinterpret_cast<const char *>(&chars[offset]), string_size);
|
|
}
|
|
|
|
void updateWeakHash32(WeakHash32 & hash) const override;
|
|
|
|
void insertRangeFrom(const IColumn & src, size_t start, size_t length) override;
|
|
|
|
ColumnPtr filter(const Filter & filt, ssize_t result_size_hint) const override;
|
|
|
|
ColumnPtr permute(const Permutation & perm, size_t limit) const override;
|
|
|
|
ColumnPtr index(const IColumn & indexes, size_t limit) const override;
|
|
|
|
template <typename Type>
|
|
ColumnPtr indexImpl(const PaddedPODArray<Type> & indexes, size_t limit) const;
|
|
|
|
void insertDefault() override
|
|
{
|
|
chars.push_back(0);
|
|
offsets.push_back(offsets.back() + 1);
|
|
}
|
|
|
|
virtual void insertManyDefaults(size_t length) override
|
|
{
|
|
chars.resize_fill(chars.size() + length);
|
|
for (size_t i = 0; i < length; ++i)
|
|
offsets.push_back(offsets.back() + 1);
|
|
}
|
|
|
|
int compareAt(size_t n, size_t m, const IColumn & rhs_, int /*nan_direction_hint*/) const override
|
|
{
|
|
const ColumnString & rhs = assert_cast<const ColumnString &>(rhs_);
|
|
return memcmpSmallAllowOverflow15(chars.data() + offsetAt(n), sizeAt(n) - 1, rhs.chars.data() + rhs.offsetAt(m), rhs.sizeAt(m) - 1);
|
|
}
|
|
|
|
/// Variant of compareAt for string comparison with respect of collation.
|
|
int compareAtWithCollation(size_t n, size_t m, const IColumn & rhs_, const Collator & collator) const;
|
|
|
|
void getPermutation(bool reverse, size_t limit, int nan_direction_hint, Permutation & res) const override;
|
|
|
|
/// Sorting with respect of collation.
|
|
void getPermutationWithCollation(const Collator & collator, bool reverse, size_t limit, Permutation & res) const;
|
|
|
|
ColumnPtr replicate(const Offsets & replicate_offsets) const override;
|
|
|
|
MutableColumns scatter(ColumnIndex num_columns, const Selector & selector) const override
|
|
{
|
|
return scatterImpl<ColumnString>(num_columns, selector);
|
|
}
|
|
|
|
void gather(ColumnGathererStream & gatherer_stream) override;
|
|
|
|
void reserve(size_t n) override;
|
|
|
|
void getExtremes(Field & min, Field & max) const override;
|
|
|
|
|
|
bool canBeInsideNullable() const override { return true; }
|
|
|
|
bool structureEquals(const IColumn & rhs) const override
|
|
{
|
|
return typeid(rhs) == typeid(ColumnString);
|
|
}
|
|
|
|
|
|
Chars & getChars() { return chars; }
|
|
const Chars & getChars() const { return chars; }
|
|
|
|
Offsets & getOffsets() { return offsets; }
|
|
const Offsets & getOffsets() const { return offsets; }
|
|
};
|
|
|
|
|
|
}
|