mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-01 20:12:02 +00:00
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
|
#pragma once
|
||
|
|
|
||
|
|
#include <vector>
|
||
|
|
#include <Columns/ColumnString.h>
|
||
|
|
|
||
|
|
|
||
|
|
namespace DB
|
||
|
|
{
|
||
|
|
|
||
|
|
template <typename Impl>
|
||
|
|
struct MultiSearchImpl
|
||
|
|
{
|
||
|
|
using ResultType = UInt8;
|
||
|
|
static constexpr bool is_using_hyperscan = false;
|
||
|
|
/// Variable for understanding, if we used offsets for the output, most
|
||
|
|
/// likely to determine whether the function returns ColumnVector of ColumnArray.
|
||
|
|
static constexpr bool is_column_array = false;
|
||
|
|
static auto getReturnType() { return std::make_shared<DataTypeNumber<ResultType>>(); }
|
||
|
|
|
||
|
|
static void vectorConstant(
|
||
|
|
const ColumnString::Chars & haystack_data,
|
||
|
|
const ColumnString::Offsets & haystack_offsets,
|
||
|
|
const std::vector<StringRef> & needles,
|
||
|
|
PaddedPODArray<UInt8> & res,
|
||
|
|
[[maybe_unused]] PaddedPODArray<UInt64> & offsets)
|
||
|
|
{
|
||
|
|
auto searcher = Impl::createMultiSearcherInBigHaystack(needles);
|
||
|
|
const size_t haystack_string_size = haystack_offsets.size();
|
||
|
|
res.resize(haystack_string_size);
|
||
|
|
size_t iteration = 0;
|
||
|
|
while (searcher.hasMoreToSearch())
|
||
|
|
{
|
||
|
|
size_t prev_offset = 0;
|
||
|
|
for (size_t j = 0; j < haystack_string_size; ++j)
|
||
|
|
{
|
||
|
|
const auto * haystack = &haystack_data[prev_offset];
|
||
|
|
const auto * haystack_end = haystack + haystack_offsets[j] - prev_offset - 1;
|
||
|
|
if (iteration == 0 || !res[j])
|
||
|
|
res[j] = searcher.searchOne(haystack, haystack_end);
|
||
|
|
prev_offset = haystack_offsets[j];
|
||
|
|
}
|
||
|
|
++iteration;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|