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685 lines
25 KiB
C++
685 lines
25 KiB
C++
#pragma once
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#include <type_traits>
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#include <base/types.h>
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#include <Common/Volnitsky.h>
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#include <Columns/ColumnString.h>
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#include <Columns/ColumnsNumber.h>
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#include <Core/ColumnNumbers.h>
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#include <Functions/Regexps.h>
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#include "config.h"
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#include <re2_st/re2.h>
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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 ILLEGAL_COLUMN;
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}
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namespace impl
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{
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/// Is the [I]LIKE expression equivalent to a substring search?
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inline bool likePatternIsSubstring(std::string_view pattern, String & res)
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{
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/// TODO: ignore multiple leading or trailing %
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if (pattern.size() < 2 || !pattern.starts_with('%') || !pattern.ends_with('%'))
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return false;
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res.clear();
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res.reserve(pattern.size() - 2);
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const char * pos = pattern.data() + 1;
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const char * const end = pattern.data() + pattern.size() - 1;
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while (pos < end)
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{
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switch (*pos)
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{
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case '%':
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case '_':
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return false;
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case '\\':
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++pos;
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if (pos == end)
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/// pattern ends with \% --> trailing % is to be taken literally and pattern doesn't qualify for substring search
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return false;
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else
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{
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switch (*pos)
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{
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/// Known LIKE escape sequences:
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case '%':
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case '_':
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case '\\':
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res += *pos;
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break;
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/// For all other escape sequences, the backslash loses its special meaning
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default:
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res += '\\';
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res += *pos;
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break;
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}
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}
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break;
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default:
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res += *pos;
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break;
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}
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++pos;
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}
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return true;
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}
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}
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// For more readable instantiations of MatchImpl<>
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struct MatchTraits
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{
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enum class Syntax
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{
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Like,
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Re2
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};
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enum class Case
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{
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Sensitive,
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Insensitive
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};
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enum class Result
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{
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DontNegate,
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Negate
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};
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};
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/**
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* NOTE: We want to run regexp search for whole columns by one call (as implemented in function 'position')
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* but for that, regexp engine must support \0 bytes and their interpretation as string boundaries.
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*/
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template <typename Name, MatchTraits::Syntax syntax_, MatchTraits::Case case_, MatchTraits::Result result_>
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struct MatchImpl
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{
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static constexpr bool use_default_implementation_for_constants = true;
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static constexpr bool supports_start_pos = false;
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static constexpr auto name = Name::name;
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static ColumnNumbers getArgumentsThatAreAlwaysConstant() { return {2};}
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using ResultType = UInt8;
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static constexpr bool is_like = (syntax_ == MatchTraits::Syntax::Like);
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static constexpr bool case_insensitive = (case_ == MatchTraits::Case::Insensitive);
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static constexpr bool negate = (result_ == MatchTraits::Result::Negate);
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using Searcher = std::conditional_t<case_insensitive, VolnitskyCaseInsensitiveUTF8, VolnitskyUTF8>;
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static void vectorConstant(
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const ColumnString::Chars & haystack_data,
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const ColumnString::Offsets & haystack_offsets,
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const String & needle,
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[[maybe_unused]] const ColumnPtr & start_pos_,
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PaddedPODArray<UInt8> & res,
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[[maybe_unused]] ColumnUInt8 * res_null)
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{
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/// `res_null` serves as an output parameter for implementing an XYZOrNull variant.
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assert(!res_null);
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const size_t haystack_size = haystack_offsets.size();
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assert(haystack_size == res.size());
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assert(start_pos_ == nullptr);
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if (haystack_offsets.empty())
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return;
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/// Shortcut for the silly but practical case that the pattern matches everything/nothing independently of the haystack:
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/// - col [not] [i]like '%' / '%%'
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/// - match(col, '.*')
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if ((is_like && (needle == "%" or needle == "%%")) || (!is_like && (needle == ".*" || needle == ".*?")))
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{
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for (auto & x : res)
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x = !negate;
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return;
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}
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/// Special case that the [I]LIKE expression reduces to finding a substring in a string
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String strstr_pattern;
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if (is_like && impl::likePatternIsSubstring(needle, strstr_pattern))
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{
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const UInt8 * const begin = haystack_data.data();
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const UInt8 * const end = haystack_data.data() + haystack_data.size();
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const UInt8 * pos = begin;
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/// The current index in the array of strings.
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size_t i = 0;
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/// TODO You need to make that `searcher` is common to all the calls of the function.
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Searcher searcher(strstr_pattern.data(), strstr_pattern.size(), end - pos);
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/// We will search for the next occurrence in all rows at once.
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while (pos < end && end != (pos = searcher.search(pos, end - pos)))
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{
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/// Let's determine which index it refers to.
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while (begin + haystack_offsets[i] <= pos)
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{
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res[i] = negate;
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++i;
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}
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/// We check that the entry does not pass through the boundaries of strings.
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if (pos + strstr_pattern.size() < begin + haystack_offsets[i])
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res[i] = !negate;
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else
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res[i] = negate;
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pos = begin + haystack_offsets[i];
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++i;
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}
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/// Tail, in which there can be no substring.
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if (i < res.size())
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memset(&res[i], negate, (res.size() - i) * sizeof(res[0]));
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return;
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}
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const auto & regexp = Regexps::Regexp(Regexps::createRegexp<is_like, /*no_capture*/ true, case_insensitive>(needle));
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String required_substring;
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bool is_trivial;
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bool required_substring_is_prefix; /// for `anchored` execution of the regexp.
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regexp.getAnalyzeResult(required_substring, is_trivial, required_substring_is_prefix);
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if (required_substring.empty())
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{
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if (!regexp.getRE2()) /// An empty regexp. Always matches.
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memset(res.data(), !negate, haystack_size * sizeof(res[0]));
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else
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{
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size_t prev_offset = 0;
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for (size_t i = 0; i < haystack_size; ++i)
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{
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const bool match = regexp.getRE2()->Match(
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{reinterpret_cast<const char *>(&haystack_data[prev_offset]), haystack_offsets[i] - prev_offset - 1},
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0,
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haystack_offsets[i] - prev_offset - 1,
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re2_st::RE2::UNANCHORED,
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nullptr,
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0);
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res[i] = negate ^ match;
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prev_offset = haystack_offsets[i];
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}
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}
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}
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else
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{
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/// NOTE This almost matches with the case of impl::likePatternIsSubstring.
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const UInt8 * const begin = haystack_data.data();
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const UInt8 * const end = haystack_data.begin() + haystack_data.size();
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const UInt8 * pos = begin;
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/// The current index in the array of strings.
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size_t i = 0;
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Searcher searcher(required_substring.data(), required_substring.size(), end - pos);
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/// We will search for the next occurrence in all rows at once.
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while (pos < end && end != (pos = searcher.search(pos, end - pos)))
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{
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/// Determine which index it refers to.
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while (begin + haystack_offsets[i] <= pos)
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{
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res[i] = negate;
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++i;
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}
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/// We check that the entry does not pass through the boundaries of strings.
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if (pos + required_substring.size() < begin + haystack_offsets[i])
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{
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/// And if it does not, if necessary, we check the regexp.
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if (is_trivial)
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res[i] = !negate;
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else
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{
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const char * str_data = reinterpret_cast<const char *>(&haystack_data[haystack_offsets[i - 1]]);
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size_t str_size = haystack_offsets[i] - haystack_offsets[i - 1] - 1;
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/** Even in the case of `required_substring_is_prefix` use UNANCHORED check for regexp,
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* so that it can match when `required_substring` occurs into the string several times,
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* and at the first occurrence, the regexp is not a match.
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*/
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const size_t start_pos = (required_substring_is_prefix) ? (reinterpret_cast<const char *>(pos) - str_data) : 0;
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const size_t end_pos = str_size;
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const bool match = regexp.getRE2()->Match(
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{str_data, str_size},
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start_pos,
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end_pos,
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re2_st::RE2::UNANCHORED,
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nullptr,
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0);
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res[i] = negate ^ match;
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}
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}
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else
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res[i] = negate;
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pos = begin + haystack_offsets[i];
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++i;
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}
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/// Tail, in which there can be no substring.
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if (i < res.size())
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memset(&res[i], negate, (res.size() - i) * sizeof(res[0]));
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}
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}
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/// Very carefully crafted copy-paste.
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static void vectorFixedConstant(
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const ColumnString::Chars & haystack,
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size_t N,
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const String & needle,
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PaddedPODArray<UInt8> & res,
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[[maybe_unused]] ColumnUInt8 * res_null)
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{
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/// `res_null` serves as an output parameter for implementing an XYZOrNull variant.
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assert(!res_null);
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const size_t haystack_size = haystack.size() / N;
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assert(haystack_size == res.size());
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if (haystack.empty())
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return;
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/// Shortcut for the silly but practical case that the pattern matches everything/nothing independently of the haystack:
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/// - col [not] [i]like '%' / '%%'
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/// - match(col, '.*')
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if ((is_like && (needle == "%" or needle == "%%")) || (!is_like && (needle == ".*" || needle == ".*?")))
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{
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for (auto & x : res)
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x = !negate;
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return;
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}
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/// Special case that the [I]LIKE expression reduces to finding a substring in a string
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String strstr_pattern;
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if (is_like && impl::likePatternIsSubstring(needle, strstr_pattern))
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{
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const UInt8 * const begin = haystack.data();
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const UInt8 * const end = haystack.data() + haystack.size();
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const UInt8 * pos = begin;
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size_t i = 0;
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const UInt8 * next_pos = begin;
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/// If needle is larger than string size - it cannot be found.
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if (strstr_pattern.size() <= N)
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{
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Searcher searcher(strstr_pattern.data(), strstr_pattern.size(), end - pos);
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/// We will search for the next occurrence in all rows at once.
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while (pos < end && end != (pos = searcher.search(pos, end - pos)))
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{
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/// Let's determine which index it refers to.
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while (next_pos + N <= pos)
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{
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res[i] = negate;
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next_pos += N;
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++i;
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}
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next_pos += N;
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/// We check that the entry does not pass through the boundaries of strings.
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if (pos + strstr_pattern.size() <= next_pos)
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res[i] = !negate;
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else
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res[i] = negate;
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pos = next_pos;
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++i;
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}
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}
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/// Tail, in which there can be no substring.
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if (i < res.size())
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memset(&res[i], negate, (res.size() - i) * sizeof(res[0]));
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return;
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}
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const auto & regexp = Regexps::Regexp(Regexps::createRegexp<is_like, /*no_capture*/ true, case_insensitive>(needle));
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String required_substring;
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bool is_trivial;
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bool required_substring_is_prefix; /// for `anchored` execution of the regexp.
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regexp.getAnalyzeResult(required_substring, is_trivial, required_substring_is_prefix);
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if (required_substring.empty())
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{
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if (!regexp.getRE2()) /// An empty regexp. Always matches.
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memset(res.data(), !negate, haystack_size * sizeof(res[0]));
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else
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{
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size_t offset = 0;
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for (size_t i = 0; i < haystack_size; ++i)
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{
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const bool match = regexp.getRE2()->Match(
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{reinterpret_cast<const char *>(&haystack[offset]), N},
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0,
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N,
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re2_st::RE2::UNANCHORED,
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nullptr,
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0);
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res[i] = negate ^ match;
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offset += N;
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}
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}
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}
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else
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{
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/// NOTE This almost matches with the case of likePatternIsSubstring.
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const UInt8 * const begin = haystack.data();
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const UInt8 * const end = haystack.data() + haystack.size();
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const UInt8 * pos = begin;
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size_t i = 0;
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const UInt8 * next_pos = begin;
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/// If required substring is larger than string size - it cannot be found.
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if (required_substring.size() <= N)
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{
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Searcher searcher(required_substring.data(), required_substring.size(), end - pos);
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/// We will search for the next occurrence in all rows at once.
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while (pos < end && end != (pos = searcher.search(pos, end - pos)))
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{
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/// Let's determine which index it refers to.
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while (next_pos + N <= pos)
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{
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res[i] = negate;
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next_pos += N;
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++i;
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}
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next_pos += N;
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if (pos + required_substring.size() <= next_pos)
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{
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/// And if it does not, if necessary, we check the regexp.
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if (is_trivial)
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res[i] = !negate;
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else
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{
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const char * str_data = reinterpret_cast<const char *>(next_pos - N);
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/** Even in the case of `required_substring_is_prefix` use UNANCHORED check for regexp,
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* so that it can match when `required_substring` occurs into the string several times,
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* and at the first occurrence, the regexp is not a match.
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*/
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const size_t start_pos = (required_substring_is_prefix) ? (reinterpret_cast<const char *>(pos) - str_data) : 0;
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const size_t end_pos = N;
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const bool match = regexp.getRE2()->Match(
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{str_data, N},
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start_pos,
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end_pos,
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re2_st::RE2::UNANCHORED,
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nullptr,
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0);
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res[i] = negate ^ match;
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}
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}
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else
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res[i] = negate;
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pos = next_pos;
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++i;
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}
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}
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/// Tail, in which there can be no substring.
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if (i < res.size())
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memset(&res[i], negate, (res.size() - i) * sizeof(res[0]));
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}
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}
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static void vectorVector(
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const ColumnString::Chars & haystack_data,
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const ColumnString::Offsets & haystack_offsets,
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const ColumnString::Chars & needle_data,
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const ColumnString::Offsets & needle_offset,
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[[maybe_unused]] const ColumnPtr & start_pos_,
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PaddedPODArray<UInt8> & res,
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[[maybe_unused]] ColumnUInt8 * res_null)
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{
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/// `res_null` serves as an output parameter for implementing an XYZOrNull variant.
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assert(!res_null);
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const size_t haystack_size = haystack_offsets.size();
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assert(haystack_size == needle_offset.size());
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assert(haystack_size == res.size());
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assert(start_pos_ == nullptr);
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if (haystack_offsets.empty())
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return;
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String required_substr;
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bool is_trivial;
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bool required_substring_is_prefix; /// for `anchored` execution of the regexp.
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size_t prev_haystack_offset = 0;
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size_t prev_needle_offset = 0;
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Regexps::LocalCacheTable cache;
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Regexps::RegexpPtr regexp;
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for (size_t i = 0; i < haystack_size; ++i)
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{
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const auto * const cur_haystack_data = &haystack_data[prev_haystack_offset];
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const size_t cur_haystack_length = haystack_offsets[i] - prev_haystack_offset - 1;
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const auto * const cur_needle_data = &needle_data[prev_needle_offset];
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const size_t cur_needle_length = needle_offset[i] - prev_needle_offset - 1;
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const auto & needle = String(
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reinterpret_cast<const char *>(cur_needle_data),
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cur_needle_length);
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if (is_like && impl::likePatternIsSubstring(needle, required_substr))
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{
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if (required_substr.size() > cur_haystack_length)
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res[i] = negate;
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else
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{
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Searcher searcher(required_substr.data(), required_substr.size(), cur_haystack_length);
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const auto * match = searcher.search(cur_haystack_data, cur_haystack_length);
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res[i] = negate ^ (match != cur_haystack_data + cur_haystack_length);
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}
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}
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else
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{
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regexp = cache.getOrSet<is_like, /*no_capture*/ true, case_insensitive>(needle);
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regexp->getAnalyzeResult(required_substr, is_trivial, required_substring_is_prefix);
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if (required_substr.empty())
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{
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if (!regexp->getRE2()) /// An empty regexp. Always matches.
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res[i] = !negate;
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else
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{
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const bool match = regexp->getRE2()->Match(
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{reinterpret_cast<const char *>(cur_haystack_data), cur_haystack_length},
|
|
0,
|
|
cur_haystack_length,
|
|
re2_st::RE2::UNANCHORED,
|
|
nullptr,
|
|
0);
|
|
res[i] = negate ^ match;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Searcher searcher(required_substr.data(), required_substr.size(), cur_haystack_length);
|
|
const auto * match = searcher.search(cur_haystack_data, cur_haystack_length);
|
|
|
|
if (match == cur_haystack_data + cur_haystack_length)
|
|
res[i] = negate; // no match
|
|
else
|
|
{
|
|
if (is_trivial)
|
|
res[i] = !negate; // no wildcards in pattern
|
|
else
|
|
{
|
|
const size_t start_pos = (required_substring_is_prefix) ? (match - cur_haystack_data) : 0;
|
|
const size_t end_pos = cur_haystack_length;
|
|
|
|
const bool match2 = regexp->getRE2()->Match(
|
|
{reinterpret_cast<const char *>(cur_haystack_data), cur_haystack_length},
|
|
start_pos,
|
|
end_pos,
|
|
re2_st::RE2::UNANCHORED,
|
|
nullptr,
|
|
0);
|
|
res[i] = negate ^ match2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
prev_haystack_offset = haystack_offsets[i];
|
|
prev_needle_offset = needle_offset[i];
|
|
}
|
|
}
|
|
|
|
static void vectorFixedVector(
|
|
const ColumnString::Chars & haystack,
|
|
size_t N,
|
|
const ColumnString::Chars & needle_data,
|
|
const ColumnString::Offsets & needle_offset,
|
|
[[maybe_unused]] const ColumnPtr & start_pos_,
|
|
PaddedPODArray<UInt8> & res,
|
|
[[maybe_unused]] ColumnUInt8 * res_null)
|
|
{
|
|
/// `res_null` serves as an output parameter for implementing an XYZOrNull variant.
|
|
assert(!res_null);
|
|
|
|
const size_t haystack_size = haystack.size()/N;
|
|
|
|
assert(haystack_size == needle_offset.size());
|
|
assert(haystack_size == res.size());
|
|
assert(start_pos_ == nullptr);
|
|
|
|
if (haystack.empty())
|
|
return;
|
|
|
|
String required_substr;
|
|
bool is_trivial;
|
|
bool required_substring_is_prefix; // for `anchored` execution of the regexp.
|
|
|
|
size_t prev_haystack_offset = 0;
|
|
size_t prev_needle_offset = 0;
|
|
|
|
Regexps::LocalCacheTable cache;
|
|
Regexps::RegexpPtr regexp;
|
|
|
|
for (size_t i = 0; i < haystack_size; ++i)
|
|
{
|
|
const auto * const cur_haystack_data = &haystack[prev_haystack_offset];
|
|
const size_t cur_haystack_length = N;
|
|
|
|
const auto * const cur_needle_data = &needle_data[prev_needle_offset];
|
|
const size_t cur_needle_length = needle_offset[i] - prev_needle_offset - 1;
|
|
|
|
const auto & needle = String(
|
|
reinterpret_cast<const char *>(cur_needle_data),
|
|
cur_needle_length);
|
|
|
|
if (is_like && impl::likePatternIsSubstring(needle, required_substr))
|
|
{
|
|
if (required_substr.size() > cur_haystack_length)
|
|
res[i] = negate;
|
|
else
|
|
{
|
|
Searcher searcher(required_substr.data(), required_substr.size(), cur_haystack_length);
|
|
const auto * match = searcher.search(cur_haystack_data, cur_haystack_length);
|
|
res[i] = negate ^ (match != cur_haystack_data + cur_haystack_length);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
regexp = cache.getOrSet<is_like, /*no_capture*/ true, case_insensitive>(needle);
|
|
regexp->getAnalyzeResult(required_substr, is_trivial, required_substring_is_prefix);
|
|
|
|
if (required_substr.empty())
|
|
{
|
|
if (!regexp->getRE2()) /// An empty regexp. Always matches.
|
|
res[i] = !negate;
|
|
else
|
|
{
|
|
const bool match = regexp->getRE2()->Match(
|
|
{reinterpret_cast<const char *>(cur_haystack_data), cur_haystack_length},
|
|
0,
|
|
cur_haystack_length,
|
|
re2_st::RE2::UNANCHORED,
|
|
nullptr,
|
|
0);
|
|
res[i] = negate ^ match;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
Searcher searcher(required_substr.data(), required_substr.size(), cur_haystack_length);
|
|
const auto * match = searcher.search(cur_haystack_data, cur_haystack_length);
|
|
|
|
if (match == cur_haystack_data + cur_haystack_length)
|
|
res[i] = negate; // no match
|
|
else
|
|
{
|
|
if (is_trivial)
|
|
res[i] = !negate; // no wildcards in pattern
|
|
else
|
|
{
|
|
const size_t start_pos = (required_substring_is_prefix) ? (match - cur_haystack_data) : 0;
|
|
const size_t end_pos = cur_haystack_length;
|
|
|
|
const bool match2 = regexp->getRE2()->Match(
|
|
{reinterpret_cast<const char *>(cur_haystack_data), cur_haystack_length},
|
|
start_pos,
|
|
end_pos,
|
|
re2_st::RE2::UNANCHORED,
|
|
nullptr,
|
|
0);
|
|
res[i] = negate ^ match2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
prev_haystack_offset += N;
|
|
prev_needle_offset = needle_offset[i];
|
|
}
|
|
}
|
|
|
|
template <typename... Args>
|
|
static void constantVector(Args &&...)
|
|
{
|
|
throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Function '{}' doesn't support search with non-constant needles in constant haystack", name);
|
|
}
|
|
};
|
|
|
|
}
|