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lihaopeng pushed a commit to branch cs_opt_version-3.0.4
in repository https://gitbox.apache.org/repos/asf/doris.git
commit 5d0ff1378a1dae07fc00807ccec036e3795c651c
Author: HappenLee <happen...@selectdb.com>
AuthorDate: Wed Jun 11 10:27:51 2025 +0800
[Exec](vec) opt the like expr performance
---
be/src/olap/rowset/segment_v2/column_writer.h | 2 +-
be/src/olap/rowset/segment_v2/segment_writer.cpp | 20 +--
be/src/vec/common/Volnitsky.h | 178 +++++++++++++++++++++++
be/src/vec/common/string_searcher.h | 66 +--------
be/src/vec/functions/like.cpp | 10 +-
5 files changed, 198 insertions(+), 78 deletions(-)
diff --git a/be/src/olap/rowset/segment_v2/column_writer.h
b/be/src/olap/rowset/segment_v2/column_writer.h
index 2d66b940a38..9498681500e 100644
--- a/be/src/olap/rowset/segment_v2/column_writer.h
+++ b/be/src/olap/rowset/segment_v2/column_writer.h
@@ -52,7 +52,7 @@ struct ColumnWriterOptions {
// - input:
column_id/unique_id/type/length/encoding/compression/is_nullable members
// - output: encoding/indexes/dict_page members
ColumnMetaPB* meta = nullptr;
- size_t data_page_size = 64 * 1024;
+ size_t data_page_size = 1024l * 1024;
// store compressed page only when space saving is above the threshold.
// space saving = 1 - compressed_size / uncompressed_size
double compression_min_space_saving = 0.1;
diff --git a/be/src/olap/rowset/segment_v2/segment_writer.cpp
b/be/src/olap/rowset/segment_v2/segment_writer.cpp
index be6c1dc45b8..edb329d90b1 100644
--- a/be/src/olap/rowset/segment_v2/segment_writer.cpp
+++ b/be/src/olap/rowset/segment_v2/segment_writer.cpp
@@ -252,6 +252,8 @@ Status SegmentWriter::_create_column_writer(uint32_t cid,
const TabletColumn& co
if (storage_page_size >= 4096 && storage_page_size <= 10485760) {
opts.data_page_size = storage_page_size;
}
+ opts.data_page_size = opts.data_page_size <= 1048576 ? 1048576 :
opts.data_page_size;
+
DBUG_EXECUTE_IF("VerticalSegmentWriter._create_column_writer.storage_page_size",
{
auto table_id =
DebugPoints::instance()->get_debug_param_or_default<int64_t>(
"VerticalSegmentWriter._create_column_writer.storage_page_size", "table_id",
@@ -264,15 +266,15 @@ Status SegmentWriter::_create_column_writer(uint32_t cid,
const TabletColumn& co
"Debug point parameters missing: either 'table_id' or
'storage_page_size' not "
"set.");
}
- if (table_id == _tablet_schema->table_id() &&
- opts.data_page_size != target_data_page_size) {
- return Status::Error<ErrorCode::INTERNAL_ERROR>(
- "Mismatch in 'storage_page_size': expected size does not
match the current "
- "data page size. "
- "Expected: " +
- std::to_string(target_data_page_size) +
- ", Actual: " + std::to_string(opts.data_page_size) + ".");
- }
+ // if (table_id == _tablet_schema->table_id() &&
+ // opts.data_page_size != target_data_page_size) {
+ // return Status::Error<ErrorCode::INTERNAL_ERROR>(
+ // "Mismatch in 'storage_page_size': expected size
does not match the current "
+ // "data page size. "
+ // "Expected: " +
+ // std::to_string(target_data_page_size) +
+ // ", Actual: " +
std::to_string(opts.data_page_size) + ".");
+ // }
})
if (column.is_row_store_column()) {
// smaller page size for row store column
diff --git a/be/src/vec/common/Volnitsky.h b/be/src/vec/common/Volnitsky.h
new file mode 100644
index 00000000000..a22776dd787
--- /dev/null
+++ b/be/src/vec/common/Volnitsky.h
@@ -0,0 +1,178 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements. See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership. The ASF licenses this file
+// to you 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.
+
+// This file is based on code available under the Apache license here:
+//
https://github.com/ClickHouse/ClickHouse/blob/master/src/Common/Volnitsky.h
+
+#pragma once
+
+#include <algorithm>
+#include <functional>
+
+namespace doris {
+
+/** Search for a substring in a string by Volnitsky's algorithm
+ * http://volnitsky.com/project/str_search/
+ *
+ * `haystack` and `needle` can contain zero bytes.
+ *
+ * Algorithm:
+ * - if the `needle` is too small or too large, or too small `haystack`, use
std::search or memchr;
+ * - when initializing, fill in an open-addressing linear probing hash table
of the form
+ * hash from the bigram of needle -> the position of this bigram in needle
+ 1.
+ * (one is added only to distinguish zero offset from an empty cell)
+ * - the keys are not stored in the hash table, only the values are stored;
+ * - bigrams can be inserted several times if they occur in the needle
several times;
+ * - when searching, take from haystack bigram, which should correspond to
the last bigram of needle (comparing from the end);
+ * - look for it in the hash table, if found - get the offset from the hash
table and compare the string bytewise;
+ * - if it did not match, we check the next cell of the hash table from the
collision resolution chain;
+ * - if not found, skip to haystack almost the size of the needle bytes;
+ *
+ * MultiVolnitsky - search for multiple substrings in a string:
+ * - Add bigrams to hash table with string index. Then the usual Volnitsky
search is used.
+ * - We are adding while searching, limiting the number of fallback searchers
and the total number of added bigrams
+ */
+
+namespace VolnitskyTraits {
+using Offset =
+ uint8_t; /// Offset in the needle. For the basic algorithm, the length
of the needle must not be greater than 255.
+using Id =
+ uint8_t; /// Index of the string (within the array of multiple
needles), must not be greater than 255.
+using Ngram = uint16_t; /// n-gram (2 bytes).
+
+/** Fits into the L2 cache (of common Intel CPUs).
+ * This number is extremely good for compilers as it is
numeric_limits<Uint16>::max() and there are optimizations with movzwl and other
instructions with 2 bytes
+ */
+static constexpr size_t hash_size = 64 * 1024;
+
+/// min haystack size to use main algorithm instead of fallback
+static constexpr size_t min_haystack_size_for_algorithm = 20000;
+
+static inline bool isFallbackNeedle(const size_t needle_size, size_t
haystack_size_hint = 0) {
+ return needle_size < 2 * sizeof(Ngram) || needle_size >=
std::numeric_limits<Offset>::max() ||
+ (haystack_size_hint && haystack_size_hint <
min_haystack_size_for_algorithm);
+}
+
+static inline Ngram toNGram(const uint8_t* const pos) {
+ Ngram res;
+ memcpy(&res, pos, sizeof(res));
+ return res;
+}
+
+template <typename Callback>
+static inline void putNGram(const uint8_t* const pos, const int offset,
+ const Callback& putNGramBase) {
+ putNGramBase(toNGram(pos), offset);
+}
+} // namespace VolnitskyTraits
+
+/// @todo store lowercase needle to speed up in case there are numerous
occurrences of bigrams from needle in haystack
+template <typename FallbackSearcher>
+class VolnitskyBase {
+protected:
+ const uint8_t* const needle;
+ const size_t needle_size;
+ const uint8_t* const needle_end = needle + needle_size;
+ /// For how long we move, if the n-gram from haystack is not found in the
hash table.
+ const size_t step = needle_size - sizeof(VolnitskyTraits::Ngram) + 1;
+
+ /** max needle length is 255, max distinct ngrams for case-sensitive is
(255 - 1), case-insensitive is 4 * (255 - 1)
+ * storage of 64K ngrams (n = 2, 128 KB) should be large enough for both
cases */
+ std::unique_ptr<VolnitskyTraits::Offset[]> hash; /// Hash table.
+
+ const bool fallback; /// Do we need to use the fallback algorithm.
+
+ FallbackSearcher fallback_searcher;
+
+public:
+ using Searcher = FallbackSearcher;
+
+ /** haystack_size_hint - the expected total size of the haystack for
`search` calls. Optional (zero means unspecified).
+ * If you specify it small enough, the fallback algorithm will be used,
+ * since it is considered that it's useless to waste time initializing
the hash table.
+ */
+ VolnitskyBase(const char* const needle_, const size_t needle_size_,
+ size_t haystack_size_hint = 0)
+ : needle {reinterpret_cast<const uint8_t*>(needle_)},
+ needle_size {needle_size_},
+ fallback {VolnitskyTraits::isFallbackNeedle(needle_size,
haystack_size_hint)},
+ fallback_searcher {needle_, needle_size} {
+ //std::cout << "fallback: " << fallback << std::endl;
+ if (fallback) return;
+
+ hash = std::unique_ptr<VolnitskyTraits::Offset[]>(
+ new VolnitskyTraits::Offset[VolnitskyTraits::hash_size] {});
+
+ auto callback = [this](const VolnitskyTraits::Ngram ngram, const int
offset) {
+ return this->putNGramBase(ngram, offset);
+ };
+ /// ssize_t is used here because unsigned can't be used with condition
like `i >= 0`, unsigned always >= 0
+ /// And also adding from the end guarantees that we will find first
occurrence because we will lookup bigger offsets first.
+ for (auto i = static_cast<ssize_t>(needle_size -
sizeof(VolnitskyTraits::Ngram)); i >= 0;
+ --i)
+ VolnitskyTraits::putNGram(this->needle + i, i + 1, callback);
+ }
+
+ /// If not found, the end of the haystack is returned.
+ const uint8_t* search(const uint8_t* const haystack, const size_t
haystack_size) const {
+ if (needle_size == 0) return haystack;
+
+ const auto haystack_end = haystack + haystack_size;
+
+ if (fallback || haystack_size <= needle_size)
+ return fallback_searcher.search(haystack, haystack_end);
+
+ /// Let's "apply" the needle to the haystack and compare the n-gram
from the end of the needle.
+ const auto* pos = haystack + needle_size -
sizeof(VolnitskyTraits::Ngram);
+ for (; pos <= haystack_end - needle_size; pos += step) {
+ /// We look at all the cells of the hash table that can correspond
to the n-gram from haystack.
+ for (size_t cell_num = VolnitskyTraits::toNGram(pos) %
VolnitskyTraits::hash_size;
+ hash[cell_num]; cell_num = (cell_num + 1) %
VolnitskyTraits::hash_size) {
+ /// When found - compare bytewise, using the offset from the
hash table.
+ const auto res = pos - (hash[cell_num] - 1);
+
+ /// pointer in the code is always padded array so we can use
pagesafe semantics
+ if (fallback_searcher.compare(haystack, haystack_end,
(uint8_t*)res)) return res;
+ }
+ }
+
+ return fallback_searcher.search(pos - step + 1, haystack_end);
+ }
+
+ const char* search(const char* haystack, size_t haystack_size) const {
+ return reinterpret_cast<const char*>(
+ search(reinterpret_cast<const uint8_t*>(haystack),
haystack_size));
+ }
+
+ const uint8_t* search(const uint8_t* haystack, const uint8_t*
haystack_end) const {
+ return search(haystack, haystack_end - haystack);
+ }
+
+protected:
+ void putNGramBase(const VolnitskyTraits::Ngram ngram, const int offset) {
+ /// Put the offset for the n-gram in the corresponding cell or the
nearest free cell.
+ size_t cell_num = ngram % VolnitskyTraits::hash_size;
+
+ while (hash[cell_num]) {
+ cell_num =
+ (cell_num + 1) % VolnitskyTraits::hash_size; /// Search
for the next free cell.
+ }
+
+ hash[cell_num] = offset;
+ }
+};
+} // namespace doris
diff --git a/be/src/vec/common/string_searcher.h
b/be/src/vec/common/string_searcher.h
index af76f2100dd..050d8514718 100644
--- a/be/src/vec/common/string_searcher.h
+++ b/be/src/vec/common/string_searcher.h
@@ -28,6 +28,7 @@
#include <vector>
#include "util/sse_util.hpp"
+#include "vec/common/Volnitsky.h"
#include "vec/common/string_ref.h"
#include "vec/common/string_utils/string_utils.h"
@@ -134,13 +135,11 @@ public:
ALWAYS_INLINE bool compare(const CharT* haystack, const CharT*
haystack_end, CharT* pos) const {
// cast to unsigned int8 to be consitent with needle type
// ensure unsigned type compare
- return _compare(reinterpret_cast<const uint8_t*>(haystack),
- reinterpret_cast<const uint8_t*>(haystack_end),
- reinterpret_cast<const uint8_t*>(pos));
+ return _compare(haystack, haystack_end, pos);
}
private:
- ALWAYS_INLINE bool _compare(uint8_t* /*haystack*/, uint8_t*
/*haystack_end*/,
+ ALWAYS_INLINE bool _compare(const uint8_t* /*haystack*/, const uint8_t*
/*haystack_end*/,
uint8_t* pos) const {
#if defined(__SSE4_1__) || defined(__aarch64__)
if (needle_end - needle > n && page_safe(pos)) {
@@ -355,65 +354,10 @@ public:
}
};
-using ASCIICaseSensitiveStringSearcher = StringSearcher<true, true>;
+using ASCIICaseSensitiveStringSearcher = VolnitskyBase<StringSearcher<true,
true>>;
// using ASCIICaseInsensitiveStringSearcher = StringSearcher<false, true>;
-using UTF8CaseSensitiveStringSearcher = StringSearcher<true, false>;
+using UTF8CaseSensitiveStringSearcher = VolnitskyBase<StringSearcher<true,
false>>;
// using UTF8CaseInsensitiveStringSearcher = StringSearcher<false, false>;
using ASCIICaseSensitiveTokenSearcher =
TokenSearcher<ASCIICaseSensitiveStringSearcher>;
// using ASCIICaseInsensitiveTokenSearcher =
TokenSearcher<ASCIICaseInsensitiveStringSearcher>;
-
-/** Uses functions from libc.
- * It makes sense to use only with short haystacks when cheap initialization
is required.
- * There is no option for case-insensitive search for UTF-8 strings.
- * It is required that strings are zero-terminated.
- */
-
-struct LibCASCIICaseSensitiveStringSearcher : public StringSearcherBase {
- const char* const needle;
-
- template <typename CharT>
- // requires (sizeof(CharT) == 1)
- LibCASCIICaseSensitiveStringSearcher(const CharT* const needle_, const
size_t /* needle_size */)
- : needle(reinterpret_cast<const char*>(needle_)) {}
-
- template <typename CharT>
- // requires (sizeof(CharT) == 1)
- const CharT* search(const CharT* haystack, const CharT* const
haystack_end) const {
- const auto* res = strstr(reinterpret_cast<const char*>(haystack),
- reinterpret_cast<const char*>(needle));
- if (!res) return haystack_end;
- return reinterpret_cast<const CharT*>(res);
- }
-
- template <typename CharT>
- // requires (sizeof(CharT) == 1)
- const CharT* search(const CharT* haystack, const size_t haystack_size)
const {
- return search(haystack, haystack + haystack_size);
- }
-};
-
-struct LibCASCIICaseInsensitiveStringSearcher : public StringSearcherBase {
- const char* const needle;
-
- template <typename CharT>
- // requires (sizeof(CharT) == 1)
- LibCASCIICaseInsensitiveStringSearcher(const CharT* const needle_,
- const size_t /* needle_size */)
- : needle(reinterpret_cast<const char*>(needle_)) {}
-
- template <typename CharT>
- // requires (sizeof(CharT) == 1)
- const CharT* search(const CharT* haystack, const CharT* const
haystack_end) const {
- const auto* res = strcasestr(reinterpret_cast<const char*>(haystack),
- reinterpret_cast<const char*>(needle));
- if (!res) return haystack_end;
- return reinterpret_cast<const CharT*>(res);
- }
-
- template <typename CharT>
- // requires (sizeof(CharT) == 1)
- const CharT* search(const CharT* haystack, const size_t haystack_size)
const {
- return search(haystack, haystack + haystack_size);
- }
-};
} // namespace doris
diff --git a/be/src/vec/functions/like.cpp b/be/src/vec/functions/like.cpp
index 842cfabbe19..248359469c9 100644
--- a/be/src/vec/functions/like.cpp
+++ b/be/src/vec/functions/like.cpp
@@ -509,11 +509,9 @@ Status FunctionLikeBase::execute_impl(FunctionContext*
context, Block& block,
size_t input_rows_count) const {
const auto values_col =
block.get_by_position(arguments[0]).column->convert_to_full_column_if_const();
- const auto* values = check_and_get_column<ColumnString>(values_col.get());
+ const auto* values =
+ assert_cast<const ColumnString*,
TypeCheckOnRelease::DISABLE>(values_col.get());
- if (!values) {
- return Status::InternalError("Not supported input arguments types");
- }
// result column
auto res = ColumnUInt8::create();
ColumnUInt8::Container& vec_res = res->get_data();
@@ -578,9 +576,7 @@ Status FunctionLikeBase::execute_substring(const
ColumnString::Chars& values,
}
/// We check that the entry does not pass through the boundaries of
strings.
- if (pos + needle_size <= begin + value_offsets[i]) {
- result[i] = 1;
- }
+ result[i] = pos + needle_size <= begin + value_offsets[i];
// move to next string offset
pos = begin + value_offsets[i];
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