Storages: Use std::vector<UInt8> in BitmapFilter

[JinheLin]

What problem does this PR solve?

Issue Number: ref #6834

Problem Summary:

std::vector<bool> is slower than std::vector<UInt8> in most cases, because it cannot be vectorized.

What is changed and how it works?

Benchmark results of std::vector<bool> and std::vector<UInt8>:

./dbms/bench_dbms --benchmark_filter="bitmap*"
2024-10-25T11:38:41+08:00
Running ./dbms/bench_dbms
Run on (72 X 3293.35 MHz CPU s)
CPU Caches:
  L1 Data 32 KiB (x36)
  L1 Instruction 32 KiB (x36)
  L2 Unified 1024 KiB (x36)
  L3 Unified 25344 KiB (x2)
Load Average: 10.61, 9.76, 9.55
--------------------------------------------------------------
Benchmark                    Time             CPU   Iterations
--------------------------------------------------------------
bitmapAndBool           103100 ns       102751 ns         6865
bitmapAndUInt8            3522 ns         3510 ns       215219
bitmapSetRowIDBool       43899 ns        43757 ns        16324
bitmapSetRowIDUInt8      52205 ns        52036 ns        13673
bitmapSetRangeBool       36101 ns        35990 ns        19422
bitmapSetRangeUInt8       1735 ns         1729 ns       344027
bitmapGetRangeBool       24767 ns        24687 ns        28194
bitmapGetRangeUInt8        108 ns          108 ns      7176808

• Only in the case of bitmapSetRowID* that vector<UInt8> is slightly slower than vector<bool>.

  • vector<bool> is about 1.2 times faster than vector<UInt8>.
  • This is because std::vector<UInt8> cannot be vectorized by the compiler since the memory access is discrete.
  • And vector<bool> is smaller than vector<UInt8>, so it is more cache friendly.

• In bitmapAnd*, vector<UInt8> is more than 31 times faster than vector<bool>.

• In bitmapSetRange*, vector<UInt8> is more than 17 times faster than vector<bool>.

• In bitmapGetRange*, vector<UInt8> is more than 254 times faster than vector<bool>.

• Memory usage of vector<UInt8> is 8 times higher than vector<bool>. But only about 1MB for a segment with 1 million rows, I think it is acceptable.

Test results of a certain PoC:

Query	Using vector<bool>	Using vector<UInt8>
1	13.148	11.58
2	10.904	10.244
3	2.709	2.092

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[Lloyd-Pottiger]

@JinheLin I have pushed a commit to refine other functions and fixed the build of bench_dbms

[JaySon-Huang]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JaySon-Huang, Lloyd-Pottiger

The full list of commands accepted by this bot can be found here.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-10-28 03:58:01.438641081 +0000 UTC m=+235794.277796615: ☑️ agreed by Lloyd-Pottiger.
• 2024-10-28 06:06:30.871927104 +0000 UTC m=+243503.711082650: ☑️ agreed by JaySon-Huang.

[wuhuizuo]

build failure:

[ 98%] Building CXX object dbms/src/Storages/DeltaMerge/CMakeFiles/delta_merge.dir/ColumnFile/ColumnFile_V3.cpp.o

/Users/pingcap/workspace/bp-tiflash-release-darwin-arm64-qbx9j-build-binaries/source/tiflash/dbms/src/Storages/DeltaMerge/ColumnFile/ColumnFileTinyVectorIndexWriter.cpp:108:29: error: reference to local binding 'col_id' declared in enclosing function 'DB::DM::ColumnFileTinyVectorIndexWriter::buildIndexForFile'

            return [cd.id](http://cd.id/) == col_id;

                            ^

/Users/pingcap/workspace/bp-tiflash-release-darwin-arm64-qbx9j-build-binaries/source/tiflash/dbms/src/Storages/DeltaMerge/ColumnFile/ColumnFileTinyVectorIndexWriter.cpp:104:24: note: 'col_id' declared here

    for (const auto & [col_id, index_infos] : col_indexes)

                       ^

1 error generated.

make[3]: *** [dbms/src/Storages/DeltaMerge/CMakeFiles/delta_merge.dir/ColumnFile/ColumnFileTinyVectorIndexWriter.cpp.o] Error 1

make[3]: *** Waiting for unfinished jobs....

[ 98%] Building CXX object dbms/src/Functions/CMakeFiles/tiflash_functions.dir/bitShiftLeft.cpp.o

make[2]: *** [dbms/src/Storages/DeltaMerge/CMakeFiles/delta_merge.dir/all] Error 2

make[2]: *** Waiting for unfinished jobs....