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367 lines
10 KiB
C++
367 lines
10 KiB
C++
#include <Columns/ColumnFixedString.h>
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#include <Columns/ColumnsCommon.h>
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#include <Common/Arena.h>
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#include <Common/SipHash.h>
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#include <Common/memcpySmall.h>
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#include <Common/memcmpSmall.h>
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#include <Common/assert_cast.h>
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#include <Common/WeakHash.h>
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#include <Common/HashTable/Hash.h>
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#include <DataStreams/ColumnGathererStream.h>
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#include <IO/WriteHelpers.h>
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#ifdef __SSE2__
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#include <emmintrin.h>
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#endif
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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 TOO_LARGE_STRING_SIZE;
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extern const int SIZE_OF_FIXED_STRING_DOESNT_MATCH;
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extern const int SIZES_OF_COLUMNS_DOESNT_MATCH;
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extern const int PARAMETER_OUT_OF_BOUND;
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extern const int LOGICAL_ERROR;
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}
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MutableColumnPtr ColumnFixedString::cloneResized(size_t size) const
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{
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MutableColumnPtr new_col_holder = ColumnFixedString::create(n);
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if (size > 0)
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{
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auto & new_col = assert_cast<ColumnFixedString &>(*new_col_holder);
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new_col.chars.resize(size * n);
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size_t count = std::min(this->size(), size);
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memcpy(new_col.chars.data(), chars.data(), count * n * sizeof(chars[0]));
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if (size > count)
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memset(&(new_col.chars[count * n]), '\0', (size - count) * n);
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}
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return new_col_holder;
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}
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void ColumnFixedString::insert(const Field & x)
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{
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const String & s = DB::get<const String &>(x);
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if (s.size() > n)
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throw Exception("Too large string '" + s + "' for FixedString column", ErrorCodes::TOO_LARGE_STRING_SIZE);
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size_t old_size = chars.size();
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chars.resize_fill(old_size + n);
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memcpy(chars.data() + old_size, s.data(), s.size());
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}
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void ColumnFixedString::insertFrom(const IColumn & src_, size_t index)
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{
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const ColumnFixedString & src = assert_cast<const ColumnFixedString &>(src_);
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if (n != src.getN())
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throw Exception("Size of FixedString doesn't match", ErrorCodes::SIZE_OF_FIXED_STRING_DOESNT_MATCH);
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size_t old_size = chars.size();
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chars.resize(old_size + n);
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memcpySmallAllowReadWriteOverflow15(chars.data() + old_size, &src.chars[n * index], n);
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}
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void ColumnFixedString::insertData(const char * pos, size_t length)
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{
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if (length > n)
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throw Exception("Too large string for FixedString column", ErrorCodes::TOO_LARGE_STRING_SIZE);
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size_t old_size = chars.size();
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chars.resize_fill(old_size + n);
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memcpy(chars.data() + old_size, pos, length);
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}
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StringRef ColumnFixedString::serializeValueIntoArena(size_t index, Arena & arena, char const *& begin) const
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{
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auto pos = arena.allocContinue(n, begin);
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memcpy(pos, &chars[n * index], n);
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return StringRef(pos, n);
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}
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const char * ColumnFixedString::deserializeAndInsertFromArena(const char * pos)
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{
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size_t old_size = chars.size();
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chars.resize(old_size + n);
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memcpy(chars.data() + old_size, pos, n);
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return pos + n;
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}
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void ColumnFixedString::updateHashWithValue(size_t index, SipHash & hash) const
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{
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hash.update(reinterpret_cast<const char *>(&chars[n * index]), n);
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}
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void ColumnFixedString::updateWeakHash32(WeakHash32 & hash) const
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{
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auto s = size();
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if (hash.getData().size() != s)
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throw Exception("Size of WeakHash32 does not match size of column: column size is " + std::to_string(s) +
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", hash size is " + std::to_string(hash.getData().size()), ErrorCodes::LOGICAL_ERROR);
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const UInt8 * pos = chars.data();
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UInt32 * hash_data = hash.getData().data();
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for (size_t row = 0; row < s; ++row)
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{
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*hash_data = ::updateWeakHash32(pos, n, *hash_data);
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pos += n;
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++hash_data;
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}
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}
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template <bool positive>
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struct ColumnFixedString::less
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{
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const ColumnFixedString & parent;
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explicit less(const ColumnFixedString & 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 = memcmpSmallAllowOverflow15(parent.chars.data() + lhs * parent.n, parent.chars.data() + rhs * parent.n, parent.n);
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return positive ? (res < 0) : (res > 0);
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}
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};
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void ColumnFixedString::getPermutation(bool reverse, size_t limit, int /*nan_direction_hint*/, Permutation & res) const
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{
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size_t s = 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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void ColumnFixedString::insertRangeFrom(const IColumn & src, size_t start, size_t length)
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{
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const ColumnFixedString & src_concrete = assert_cast<const ColumnFixedString &>(src);
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if (start + length > src_concrete.size())
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throw Exception("Parameters start = "
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+ toString(start) + ", length = "
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+ toString(length) + " are out of bound in ColumnFixedString::insertRangeFrom method"
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" (size() = " + toString(src_concrete.size()) + ").",
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ErrorCodes::PARAMETER_OUT_OF_BOUND);
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size_t old_size = chars.size();
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chars.resize(old_size + length * n);
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memcpy(chars.data() + old_size, &src_concrete.chars[start * n], length * n);
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}
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ColumnPtr ColumnFixedString::filter(const IColumn::Filter & filt, ssize_t result_size_hint) const
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{
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size_t col_size = size();
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if (col_size != filt.size())
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throw Exception("Size of filter doesn't match size of column.", ErrorCodes::SIZES_OF_COLUMNS_DOESNT_MATCH);
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auto res = ColumnFixedString::create(n);
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if (result_size_hint)
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res->chars.reserve(result_size_hint > 0 ? result_size_hint * n : chars.size());
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const UInt8 * filt_pos = filt.data();
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const UInt8 * filt_end = filt_pos + col_size;
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const UInt8 * data_pos = chars.data();
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#ifdef __SSE2__
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/** A slightly more optimized version.
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* Based on the assumption that often pieces of consecutive values
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* completely pass or do not pass the filter.
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* Therefore, we will optimistically check the parts of `SIMD_BYTES` values.
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*/
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static constexpr size_t SIMD_BYTES = 16;
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const __m128i zero16 = _mm_setzero_si128();
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const UInt8 * filt_end_sse = filt_pos + col_size / SIMD_BYTES * SIMD_BYTES;
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const size_t chars_per_simd_elements = SIMD_BYTES * n;
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while (filt_pos < filt_end_sse)
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{
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int mask = _mm_movemask_epi8(_mm_cmpgt_epi8(_mm_loadu_si128(reinterpret_cast<const __m128i *>(filt_pos)), zero16));
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if (0 == mask)
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{
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/// Nothing is inserted.
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data_pos += chars_per_simd_elements;
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}
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else if (0xFFFF == mask)
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{
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res->chars.insert(data_pos, data_pos + chars_per_simd_elements);
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data_pos += chars_per_simd_elements;
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}
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else
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{
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size_t res_chars_size = res->chars.size();
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for (size_t i = 0; i < SIMD_BYTES; ++i)
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{
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if (filt_pos[i])
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{
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res->chars.resize(res_chars_size + n);
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memcpySmallAllowReadWriteOverflow15(&res->chars[res_chars_size], data_pos, n);
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res_chars_size += n;
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}
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data_pos += n;
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}
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}
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filt_pos += SIMD_BYTES;
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}
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#endif
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size_t res_chars_size = res->chars.size();
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while (filt_pos < filt_end)
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{
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if (*filt_pos)
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{
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res->chars.resize(res_chars_size + n);
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memcpySmallAllowReadWriteOverflow15(&res->chars[res_chars_size], data_pos, n);
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res_chars_size += n;
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}
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++filt_pos;
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data_pos += n;
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}
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return res;
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}
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ColumnPtr ColumnFixedString::permute(const Permutation & perm, size_t limit) const
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{
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size_t col_size = size();
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if (limit == 0)
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limit = col_size;
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else
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limit = std::min(col_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 ColumnFixedString::create(n);
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auto res = ColumnFixedString::create(n);
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Chars & res_chars = res->chars;
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res_chars.resize(n * limit);
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size_t offset = 0;
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for (size_t i = 0; i < limit; ++i, offset += n)
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memcpySmallAllowReadWriteOverflow15(&res_chars[offset], &chars[perm[i] * n], n);
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return res;
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}
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ColumnPtr ColumnFixedString::index(const IColumn & indexes, size_t limit) const
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{
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return selectIndexImpl(*this, indexes, limit);
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}
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template <typename Type>
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ColumnPtr ColumnFixedString::indexImpl(const PaddedPODArray<Type> & indexes, size_t limit) const
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{
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if (limit == 0)
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return ColumnFixedString::create(n);
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auto res = ColumnFixedString::create(n);
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Chars & res_chars = res->chars;
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res_chars.resize(n * limit);
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size_t offset = 0;
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for (size_t i = 0; i < limit; ++i, offset += n)
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memcpySmallAllowReadWriteOverflow15(&res_chars[offset], &chars[indexes[i] * n], n);
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return res;
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}
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ColumnPtr ColumnFixedString::replicate(const Offsets & offsets) const
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{
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size_t col_size = size();
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if (col_size != 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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auto res = ColumnFixedString::create(n);
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if (0 == col_size)
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return res;
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Chars & res_chars = res->chars;
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res_chars.resize(n * offsets.back());
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Offset curr_offset = 0;
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for (size_t i = 0; i < col_size; ++i)
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for (size_t next_offset = offsets[i]; curr_offset < next_offset; ++curr_offset)
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memcpySmallAllowReadWriteOverflow15(&res->chars[curr_offset * n], &chars[i * n], n);
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return res;
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}
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void ColumnFixedString::gather(ColumnGathererStream & gatherer)
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{
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gatherer.gather(*this);
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}
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void ColumnFixedString::getExtremes(Field & min, Field & max) const
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{
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min = String();
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max = String();
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size_t col_size = size();
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if (col_size == 0)
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return;
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size_t min_idx = 0;
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size_t max_idx = 0;
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less<true> less_op(*this);
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for (size_t i = 1; i < col_size; ++i)
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{
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if (less_op(i, min_idx))
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min_idx = i;
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else if (less_op(max_idx, i))
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max_idx = i;
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}
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get(min_idx, min);
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get(max_idx, max);
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}
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}
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