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| // Copyright 2022 PingCAP, Ltd. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| #pragma once | ||
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| #include <Columns/ColumnString.h> | ||
| #include <Core/AccurateComparison.h> | ||
| #include <Functions/StringUtil.h> | ||
| #include <common/StringRef.h> | ||
| #include <common/defines.h> | ||
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| #include <cstddef> | ||
| #include <string_view> | ||
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| namespace DB | ||
| { | ||
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| template <typename T> | ||
| ALWAYS_INLINE inline int signum(T val) | ||
| { | ||
| return (0 < val) - (val < 0); | ||
| } | ||
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| // Check equality is much faster than other comparison. | ||
| // - check size first | ||
| // - return 0 if equal else 1 | ||
| __attribute__((flatten, always_inline, pure)) inline uint8_t RawStrEqualCompare(const std::string_view & lhs, const std::string_view & rhs) | ||
| { | ||
| return StringRef(lhs) == StringRef(rhs) ? 0 : 1; | ||
| } | ||
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| // Compare str view by memcmp | ||
| __attribute__((flatten, always_inline, pure)) inline int RawStrCompare(const std::string_view & v1, const std::string_view & v2) | ||
| { | ||
| return signum(v1.compare(v2)); | ||
| } | ||
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| constexpr char SPACE = ' '; | ||
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| // Remove tail space | ||
| __attribute__((flatten, always_inline, pure)) inline std::string_view RightTrim(const std::string_view & v) | ||
| { | ||
| if (likely(v.empty() || v.back() != SPACE)) | ||
| return v; | ||
| size_t end = v.find_last_not_of(SPACE); | ||
| return end == std::string_view::npos ? std::string_view{} : std::string_view(v.data(), end + 1); | ||
| } | ||
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| __attribute__((flatten, always_inline, pure)) inline int RtrimStrCompare(const std::string_view & va, const std::string_view & vb) | ||
| { | ||
| return RawStrCompare(RightTrim(va), RightTrim(vb)); | ||
| } | ||
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| // If true, only need to check equal or not. | ||
| template <typename T> | ||
| struct IsEqualRelated | ||
| { | ||
| static constexpr const bool value = false; | ||
| }; | ||
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| // For `EqualsOp` and `NotEqualsOp`, value is true. | ||
| template <typename... A> | ||
| struct IsEqualRelated<DB::EqualsOp<A...>> | ||
| { | ||
| static constexpr const bool value = true; | ||
| }; | ||
| template <typename... A> | ||
| struct IsEqualRelated<DB::NotEqualsOp<A...>> | ||
| { | ||
| static constexpr const bool value = true; | ||
| }; | ||
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| // Loop columns and invoke callback for each pair. | ||
| template <typename F> | ||
| __attribute__((flatten, always_inline)) inline void LoopTwoColumns( | ||
| const ColumnString::Chars_t & a_data, | ||
| const ColumnString::Offsets & a_offsets, | ||
| const ColumnString::Chars_t & b_data, | ||
| const ColumnString::Offsets & b_offsets, | ||
| size_t size, | ||
| F && func) | ||
| { | ||
| for (size_t i = 0; i < size; ++i) | ||
| { | ||
| size_t a_size = StringUtil::sizeAt(a_offsets, i) - 1; | ||
| size_t b_size = StringUtil::sizeAt(b_offsets, i) - 1; | ||
| const auto * a_ptr = reinterpret_cast<const char *>(&a_data[StringUtil::offsetAt(a_offsets, i)]); | ||
| const auto * b_ptr = reinterpret_cast<const char *>(&b_data[StringUtil::offsetAt(b_offsets, i)]); | ||
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| func({a_ptr, a_size}, {b_ptr, b_size}, i); | ||
| } | ||
| } | ||
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| // Loop one column and invoke callback for each pair. | ||
| template <typename F> | ||
| __attribute__((flatten, always_inline)) inline void LoopOneColumn( | ||
| const ColumnString::Chars_t & a_data, | ||
| const ColumnString::Offsets & a_offsets, | ||
| size_t size, | ||
| F && func) | ||
| { | ||
| for (size_t i = 0; i < size; ++i) | ||
| { | ||
| size_t a_size = StringUtil::sizeAt(a_offsets, i) - 1; | ||
| const auto * a_ptr = reinterpret_cast<const char *>(&a_data[StringUtil::offsetAt(a_offsets, i)]); | ||
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| func({a_ptr, a_size}, i); | ||
| } | ||
| } | ||
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| // Handle str-column compare str-column. | ||
| // - Optimize UTF8_BIN and UTF8MB4_BIN | ||
| // - Check if columns do NOT contain tail space | ||
| // - If Op is `EqualsOp` or `NotEqualsOp`, optimize comparison by faster way | ||
| template <typename Op, typename Result> | ||
| ALWAYS_INLINE inline bool StringVectorStringVector( | ||
| const ColumnString::Chars_t & a_data, | ||
| const ColumnString::Offsets & a_offsets, | ||
| const ColumnString::Chars_t & b_data, | ||
| const ColumnString::Offsets & b_offsets, | ||
| const TiDB::TiDBCollatorPtr & collator, | ||
| Result & c) | ||
| { | ||
| bool use_optimized_path = false; | ||
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| switch (collator->getCollatorId()) | ||
| { | ||
| case TiDB::ITiDBCollator::UTF8MB4_BIN: | ||
| case TiDB::ITiDBCollator::UTF8_BIN: | ||
| { | ||
| size_t size = a_offsets.size(); | ||
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| LoopTwoColumns(a_data, a_offsets, b_data, b_offsets, size, [&c](const std::string_view & va, const std::string_view & vb, size_t i) { | ||
| if constexpr (IsEqualRelated<Op>::value) | ||
| { | ||
| c[i] = Op::apply(RawStrEqualCompare(RightTrim(va), RightTrim(vb)), 0); | ||
| } | ||
| else | ||
| { | ||
| c[i] = Op::apply(RtrimStrCompare(va, vb), 0); | ||
| } | ||
| }); | ||
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| use_optimized_path = true; | ||
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| break; | ||
| } | ||
| default: | ||
| break; | ||
| } | ||
| return use_optimized_path; | ||
| } | ||
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| // Handle str-column compare const-str. | ||
| // - Optimize UTF8_BIN and UTF8MB4_BIN | ||
| // - Right trim const-str first | ||
| // - Check if column does NOT contain tail space | ||
| // - If Op is `EqualsOp` or `NotEqualsOp`, optimize comparison by faster way | ||
| template <typename Op, typename Result> | ||
| ALWAYS_INLINE inline bool StringVectorConstant( | ||
| const ColumnString::Chars_t & a_data, | ||
| const ColumnString::Offsets & a_offsets, | ||
| const std::string_view & b, | ||
| const TiDB::TiDBCollatorPtr & collator, | ||
| Result & c) | ||
| { | ||
| bool use_optimized_path = false; | ||
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| switch (collator->getCollatorId()) | ||
| { | ||
| case TiDB::ITiDBCollator::UTF8MB4_BIN: | ||
| case TiDB::ITiDBCollator::UTF8_BIN: | ||
| { | ||
| size_t size = a_offsets.size(); | ||
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| std::string_view tar_str_view = RightTrim(b); // right trim const-str first | ||
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| LoopOneColumn(a_data, a_offsets, size, [&c, &tar_str_view](const std::string_view & view, size_t i) { | ||
| if constexpr (IsEqualRelated<Op>::value) | ||
| { | ||
| c[i] = Op::apply(RawStrEqualCompare(RightTrim(view), tar_str_view), 0); | ||
| } | ||
| else | ||
| { | ||
| c[i] = Op::apply(RawStrCompare(RightTrim(view), tar_str_view), 0); | ||
| } | ||
| }); | ||
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| use_optimized_path = true; | ||
| break; | ||
| } | ||
| default: | ||
| break; | ||
| } | ||
| return use_optimized_path; | ||
| } | ||
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| } // namespace DB |
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