C++: optimize batch read/write paths and aligned table null handling#823
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ColinLeeo wants to merge 17 commits into
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C++: optimize batch read/write paths and aligned table null handling#823ColinLeeo wants to merge 17 commits into
ColinLeeo wants to merge 17 commits into
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Brings together batch decode infrastructure, multi-value aligned read, parallel page decode, columnar tablet write, and SIMD micro-optimizations from the long-lived `final` branch into a single review-ready change. This change is a code snapshot, not a replay of `final` commit history -- the upstream history was a long sequence of WIP commits that wasn't fit for review. Supersedes #749, #754, #774. Read path - Decoder base gains batch APIs (read_batch_int32/int64/float/double, skip_*); PLAIN, TS2DIFF, Gorilla decoders implement them. TS2DIFF has block-level peeking so time filters can skip blocks without decoding. Gorilla adds a raw-pointer GorillaBitReader that bypasses ByteStream overhead. - ChunkReader / AlignedChunkReader add *_DECODE_TV_BATCH methods that decode time + value into a TsBlock in one pass, applying batch time filters before append. - AlignedChunkReader supports a multi-value mode: one time chunk + N value chunks decoded in a single pass, sharing the decoded timestamps and filter mask. SingleDeviceTsBlockReader auto-detects same-device measurements via VectorMeasurementColumnContext. - Optional page-level parallel decompression via a DecodeThreadPool + BlockingQueue when ENABLE_THREADS is set. Page-plan classification (SKIP / FULL_PASS / BOUNDARY) lets a scatter-free memcpy fast path fire when every row passes and no column has nulls. Write path - ValuePageWriter gains write_batch / write_string_batch that take timestamp+value+nullness arrays directly, removing the per-value append loop. Tablet exposes set_timestamps / set_column_values / set_column_string_repeated / reset for bulk reuse and switches StringColumn to an Arrow-compatible offset+buffer layout. - TS2DIFFEncoder::flush now packs all deltas with a single pack_bits_msb + write_buf instead of per-value write_bits, falling back to the scalar path for the rare bit_width > 56 case. - Int64Statistic::update_batch (NEON-accelerated min/max/sum). Encoding / SIMD - TS2DIFF batch decode adds AVX2 helpers via SIMDe (already on develop) for both i32 and i64; scalar fallback unchanged. - PLAIN byte-swap path uses ARM NEON (vrev64q_u8 / vrev32q_u8) when available, falling back to __builtin_bswap. - CMakeLists adds ENABLE_SIMD and turns on -O3 -march=native -flto in Release builds. Allocator / ByteStream - ByteStream caches page_mask_ (= page_size - 1) so the hot path uses a bitmask instead of modulo; wrap_from rounds buffer sizes up to a power of two so the mask remains correct. total_size_ widened to uint64_t to support files > 4GB. - UncompressedCompressor now copies its output instead of aliasing caller buffers, letting callers free input safely. C wrapper / Arrow - Trimmed unused metadata-export surface (TsFileStatisticBase, TimeseriesMetadata, DeviceTimeseriesMetadataEntry, tag-filter handles) out of the public C API. Internal tag filtering is unaffected. - arrow_c.cc simplified: per-row offset handling for sliced variable-length arrays in place of the InvertArrowBitmap copy. Tests / benchmarks - New tsfile_reader_table_batch_test.cc covers the TsBlock batch read path. gorilla_codec_test.cc adds Int32/Int64/Float batch decode tests. examples/cpp_examples adds bench_read.cpp/.h and an examples/read_perf_compare/ target. - Removed cwrapper_metadata_test.cc and common/path.cc (Path bodies inlined into path.h; the C metadata API they covered is gone). Compatibility - All new C++ methods are additions; no existing C++ API was removed. - C wrapper headers lost the metadata export / tag filter symbols listed above -- downstream callers (Python wrapper in particular) will want a sanity check before merge. - cpp/third_party/ intentionally left at develop's state so the recent MSVC compatibility fixes (WITH_STATIC_CRT OFF, CMP0054 NEW, CMAKE_POLICY_VERSION_MINIMUM=3.5, _MSC_VER guards) are preserved. Verification - cmake configure + make -j on macOS arm64 (AppleClang, C++11) builds cleanly: libtsfile.2.2.1.dev.dylib and TsFile_Test both link, zero errors, only unused-lambda-capture warnings in pre-existing tests. - Full TsFile_Test run and downstream Python binding load are left as pre-merge checks. Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>
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## develop #823 +/- ##
===========================================
- Coverage 61.32% 58.35% -2.97%
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Files 731 733 +2
Lines 45521 47547 +2026
Branches 6772 7376 +604
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- Hits 27914 27747 -167
- Misses 16615 18619 +2004
- Partials 992 1181 +189 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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The big batch read/write snapshot (5f12115) was taken against an older `final` branch base, so it inadvertently dropped the TimeseriesMetadata / DeviceID family of C APIs that develop had gained via #767. Python bindings still reference them, so the binding fails to load. Restore the typedefs, function declarations, helpers, and public implementations verbatim from develop, and add the missing common/* includes (device_id.h, statistic.h, tsfile_common.h, <vector>). Also fix an unrelated CMake parse error in test/CMakeLists.txt where \${URL} had been split across two lines.
These wall-clock perf comparisons with 5% tolerance are inherently flaky on noisy CI; develop already disabled them. The batch-opt snapshot (5f12115) was based on an older final branch and reverted that disable. Re-add the DISABLED_ prefix in both tree-view and table-view variants to match develop.
Match develop: rename the fixture class to DISABLED_ so all four TEST_F cases (TreeModel/TableModel × Single/MultiSequence) are skipped by default. They're wall-clock perf benchmarks meant to be run on demand via --gtest_also_run_disabled_tests.
Python binding (already on develop) calls these table-model query APIs with a tag_filter + batch_size argument, but the batch-opt snapshot (5f12115) reverted them to the older final signatures that drop tag_filter (and rename one). Realign with develop: - TsFileReader::queryByRow(table_name, ...) gains Filter*/batch_size default args and passes tag_filter through to TableQueryExecutor. - tsfile_reader_query_table_by_row gains tag_filter + batch_size. - tsfile_query_table_batch gains tag_filter (between end_time and batch_size). - tsfile_query_table_batch_with_filter is renamed to tsfile_query_table_with_tag_filter with develop's parameter order (tag_filter before batch_size); the old name had no callers. - TagFilterHandle typedef hoisted above first use.
Several more bits that develop had but the batch-opt snapshot reverted:
- cwrapper: add TagFilterOp enum + tsfile_tag_filter_create +
tsfile_tag_filter_between. Python binding already calls these.
- StringArrayDeviceID::split_device_id_string(string): always feed
the raw splits through the interpretive split_device_id_string(vec)
overload (joining the first N-1 segments into a table_name) for both
ANTLR4 and non-ANTLR4 paths. The snapshot had bypassed the
interpretation in the non-ANTLR4 branch, which produced 3 segments
for "root.sg.d1" instead of {"root.sg","d1"} and broke metadata
consumers (and the restored cwrapper_metadata_test). ENABLE_ANTLR4
is set as a CMake option but never -D'd to the compiler, so every
build was hitting the non-ANTLR4 branch.
- test: restore cpp/test/cwrapper/cwrapper_metadata_test.cc (294 lines,
taken from develop) -- the file is auto-picked by the test
CMakeLists' GLOB_RECURSE.
- test: re-apply DISABLED_ prefix to LargeFileNoEncodingNoCompression_
WriteAndRead and MemStatWriteAndVerify; develop has them disabled.
- test: update query_by_row_cwrapper_test.cc:218 to pass the new
tag_filter/batch_size args added to tsfile_reader_query_table_by_row.
493 tests pass, 8 disabled (the perf benchmarks).
Mechanical reformat after the previous restore commits; no behavior change.
Four behavior gaps the batch-opt snapshot reintroduced surfaced as Python test failures (tag-filter tag-filtered table queries, dataset arrow batch reads, multi-segment device tree queryByRow, missing-path tree queryByRow): - Path(string): join nodes[:-1] back into a single string and feed it through the interpretive StringArrayDeviceID(string) ctor instead of storing the raw per-segment vector. Without this, a stored "root.sg.d1" device (2 segments after the interpretive split) does not match a query path of "root.sg.d1.s1" whose device gets stored as 3 segments. - QDSWithoutTimeGenerator::init: skip paths whose device/measurement isn't in the file (E_MEASUREMENT_NOT_EXIST, E_DEVICE_NOT_EXIST, E_NOT_EXIST, and the bloom-filter early return E_NO_MORE_DATA) and keep going, like the Java implementation. Previously any missing path aborted the whole query. - TableQueryExecutor::query (with offset/limit): pass the executor's return_mode_ to the TableResultSet. Without it the result set defaults to RETURN_ROW and get_next_tsblock returns E_INVALID_ARG for batched/Arrow consumers. - TsFileReader: introduce ensure_table_query_executor(batch_size) helper. The cached TableQueryExecutor was created on first call and reused regardless of batch_size, so a later batched query would inherit the original RETURN_ROW executor. All 493 C++ tests and 144 Python tests pass.
The MinGW gcc 15.2 + statically-linked antlr4_static combination
fails to resolve antlr4::Lexer symbols (setChannel, getChannel,
non-virtual thunks, ...) at link time when -flto is on -- the LTO
intermediate objects can't see the .a's vtable thunks. -march=native
is also wrong for CI binaries that get shipped to other machines.
Keep both flags on Linux/macOS where they actually pay off.
Also fix a stray '${' line break in the MSVC ASAN section of
cpp/CMakeLists.txt -- same kind of broken variable reference that
took out cpp/test/CMakeLists.txt earlier.
Four portability gaps that surface as build errors on all MSVC toolchains (and as additional std::min errors on v141): - common/allocator/my_string.h: restore #include <algorithm> that the batch-opt snapshot dropped. Without it, std::min isn't declared on v141, the unqualified min(...) call falls through to the non-const common::String::min member, and MSVC errors out with C2039/C2662. - common/container/bit_map.h: add a uint64_t overload of bitops::ctz_nonzero with MSVC _BitScanForward64 / fallback loop branches alongside the existing uint32_t one. Existing uint8_t callers in BitMap::next_set_bit are cast to uint32_t to keep the overload set unambiguous. - common/tablet.cc: replace __builtin_ctzll with the new common::bitops::ctz_nonzero(uint64_t) helper. - encoding/plain_decoder.h: add inline plain_bswap32 / plain_bswap64 helpers (MSVC _byteswap_ulong / _byteswap_uint64) and use them in the three big-endian read_batch sites instead of __builtin_bswap*. - cwrapper/tsfile_cwrapper.cc: guard S_ISDIR (POSIX-only) with a _WIN32 fallback using _S_IFDIR. 493 C++ tests still pass on macOS.
DeviceQueryTask and the MetaIndexNode tree that feeds it are placement-new'd into PageArena memory by the batch-read path. The arenas only release the raw bytes, so the non-trivial members of those objects (std::vector<std::string>, std::vector<shared_ptr>, shared_ptr<IDeviceID> -> StringArrayDeviceID, etc.) leak when the arena goes away without ever invoking the destructors. Linux LSan caught it; macOS ASan doesn't ship LSan so the same job passes on the mac runner. Two surgical changes: - DeviceTaskIterator now records every DeviceQueryTask it produces in a vector and explicitly calls ~DeviceQueryTask() on each one in its destructor before destroying the arena. - DeviceQueryTask::~DeviceQueryTask() now invokes ~MetaIndexNode() on index_root_ (which was placement-new'd into DeviceMetaIterator's arena and handed over here via DeviceMetaIterator::next). Once that destructor runs, the children_ vector tears down its shared_ptr<IMetaIndexEntry> graph, fires the existing self_destructor / self_deleter for IMetaIndexEntry and DeviceMetaIndexEntry, which in turn releases the shared_ptr<StringArrayDeviceID>. All three top-tier leak signatures in the ASan log chain off this single root.
Three independent regressions the batch-opt snapshot introduced that
only surface on the MSVC toolchain:
1. reader/result_set.h missed #include <cctype>. v141 doesn't pull the
one-arg std::tolower(int) overload in transitively, so the
CaseInsensitiveHash / CaseInsensitiveEqual call sites fail to find
it and fall through to the locale-aware two-arg template
(C2672/C2780). Add the include.
2. common/tablet.h had no copy/move semantics, so MSVC Debug
(which doesn't always perform NRVO) was shallow-copying a Tablet
on `return tablet;` in test helpers like gen_tablet. The source
destructor then freed value_matrix_[c].string_col while the
returned copy still pointed at it -- heap-use-after-free in
find_all_device_boundaries on every Debug+ASan table-mode test.
Delete the copy ctor/assign and add a pointer-stealing move
ctor/assign so return-by-value is safe.
3. encoding/int{32,64}_rle_decoder.h dropped the RLE-run decode
branch in the snapshot, leaving only bit-packing. The encoder
still emits varint headers with the low bit indicating bit-packing
vs run, so dictionary tests (which encode a single-entry vocabulary
as an RLE run) read garbage codes and index past entry_index_ ->
heap-buffer-overflow in std::basic_string ctor on Release+ASan.
Restore develop's full decoder (RLE-run + varint header + out-param
read_int API) and update the three callers (DictionaryDecoder,
Int32SprintzDecoder, Int64SprintzDecoder) to the out-param API.
493 C++ tests still pass on macOS.
libstdc++'s <regex> implementation declares anonymous-namespace globals (__classnames at bits/regex.tcc:285, __collatenames at :128). With -flto each translation unit that includes <regex> ends up with its own LTO partition copy, and the ASan runtime sees two registered globals at the same name and aborts the test binary with odr-violation before any test runs. Strip -flto from CMAKE_CXX_FLAGS_RELEASE inside the ASan branch so the rest of the Release flags (-O3, -march=native) still apply.
…buffers Two real regressions only the Linux Release+ASan job catches: 1. Int64Packer::unpack_8values reads its input one byte at a time in a tight loop. With -O3 -march=native gcc autovectorizes it into AVX2 32-byte gathers that overread the input by up to one SIMD lane; the read lands in ASan's redzone and ASan reports it as SEGV (3 Int64PackerTest cases). The scalar code is correct, so just strip -march=native from CMAKE_CXX_FLAGS_RELEASE when ASan is on, alongside the -flto strip that's already there. 2. AlignedChunkReader::destroy() does chunk_pages_.clear() but the .clear() leaves the vector's internal buffer allocated. AlignedChunkReader is placement-new'd into a mem_alloc'd region that mem_free can't drain, so the ChunkPageInfo backing buffer leaks (3 table-mode tests). I can't fix it by calling chunk_reader_->~IChunkReader() in TsFileSeriesScanIterator:: destroy() because destroy() already runs manual destructors on chunk_header_/decoders/compressor inside; a virtual dtor on top would double-destruct those (CWrapperTest, BasicTest hit this). Instead, swap chunk_pages_ and page_all_times_ with empty vectors inside AlignedChunkReader::destroy() so the heap buffers get released without touching the destructor chain.
…hon loop `series[s:e]` on a TsFileDataFrame fans out to TsFileSeriesReader. read_series_by_row, which was issuing query_table_by_row in RETURN_ROW mode and then calling result_set.next() + get_value_by_name() per row. Every iteration is a Python<->C round-trip plus two list.append() calls, so a 10k-row slice costs ~30k transitions and dominates wall time -- it's actually slower than the pre-optimization scalar path because the batch/parallel work paid for by the snapshot only kicks in when batch_size>0, which this call site never set. Pass batch_size=65536 instead and drain the result set via read_arrow_batch(), pushing each TsBlock straight into numpy via the existing Arrow C-Data interface (mirrors what _read_arrow / read_device_fields_by_time_range already does). The outer while-remaining retry loop is kept so we can re-issue from the advanced offset if the native call stops at an internal block boundary before the requested window is filled. The boundary-retry unit test is updated to mock read_arrow_batch (returning a pyarrow.Table per call) and to assert batch_size>0 is actually plumbed through, so we don't silently regress to the slow path again. 152 Python tests pass.
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Pull request overview
This PR consolidates a large optimization branch into develop: it adds batch decode/write APIs across the C++ Decoder/Encoder hierarchy, multi-value aligned read paths with optional parallel decode, columnar tablet write helpers, SIMD fast paths, and a set of correctness fixes for aligned/table null handling (null TAG segments, null FIELD writes, all-null value pages, sparse aligned columns, repeated logical devices, ValuePageWriter::reset state). It also trims the C wrapper API (drops unused metadata export/tag-filter symbols, then re-adds tag-filter helpers in a different section) and removes several regression tests for behaviors it claims to fix.
Changes:
- Add batch decode/encode/write paths through
Decoder/Encoder/page/chunk writers and aMultiAlignedTimeseriesIndexplus single-device aligned fast-path reader. - Several aligned table fixes (null TAG/FIELD, all-null pages, single-device tablet flag,
ValuePageWriter::reset, double-free of first-page buffers viarelease_cur_page_data). - Build/infra: SIMD option, optional
BUILD_EXAMPLES, mem-stat counters widened to 64-bit, newBlockingQueue, removal of several existing regression tests, license-header punctuation churn in multiple CMake files.
Reviewed changes
Copilot reviewed 118 out of 119 changed files in this pull request and generated 12 comments.
Show a summary per file
| File | Description |
|---|---|
| cpp/src/reader/filter/{and,or}_filter.h, filter.h, time_operator.h | Adds satisfy_batch_time (uses fixed 129-element stack buffer — flagged). |
| cpp/src/encoding/{plain,decoder,encoder,plain_decoder,dictionary_encoder}.h | Batch encode/decode API + dictionary index assignment change (flagged). |
| cpp/src/writer/{value_,time_,}{chunk,page}_writer.{h,cc} | Batch write paths, first-page ownership transfer, larger page buffers. |
| cpp/src/writer/tsfile_table_writer.{h,cc}, tsfile_writer.h | Memoized lowercasing, idempotent close, optional parallel write pool. |
| cpp/src/reader/* | Aligned multi-value batch path, bloom-filter contains, table result-set lifecycle. |
| cpp/src/file/tsfile_io_writer.{h,cc}, restorable_tsfile_io_writer.cc | Recovery cleanup simplified; conditional sync_on_close_ (flagged); chunk-group index for O(1) lookup. |
| cpp/src/file/tsfile_io_reader.h | Device-node cache + multi-SSI alloc. |
| cpp/src/common/allocator/byte_stream.h, alloc_base.h, mem_alloc.cc | Page-mask bitwise modulo + power-of-2 rounding for wrapped buffers (flagged), 64-bit stat counters. |
| cpp/src/common/{tablet,schema,path,global,thread_pool}.* | Single-device flag, string-column uint32_t offsets, Path inlined, config knobs reshuffled. |
| cpp/src/common/container/{bit_map,blocking_queue,byte_buffer}.* | New BlockingQueue, BitMap::may_have_set_bits, bounds asserts. |
| cpp/src/compress/{snappy,lz4,uncompressed}_compressor.* | Safer after_compress ownership handling; Uncompressed now copies. |
| cpp/src/cwrapper/{tsfile_cwrapper.h,arrow_c.cc} | Tag-filter API moved, sliced-Arrow handling reverted (loses prior bug-fix paths). |
| cpp/test/** | Deletes several regression tests (deep path, missing measurement, aligned NULL boundary, dictionary RLE run counts, Arrow slice-with-offset, etc.) and adds new batch/page-boundary tests. |
| python/tsfile/dataset/reader.py + tests | Switches row reads to read_arrow_batch(). |
| cpp/{CMakeLists.txt,examples/**,src/CMakeLists.txt,src/common/CMakeLists.txt,test/CMakeLists.txt} | Build flags, SIMD option, Arrow/Parquet-dependent examples, license-header punctuation regressions. |
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| int satisfy_batch_time(const int64_t* times, int count, bool* mask) { | ||
| bool mask_right[129]; | ||
| left_->satisfy_batch_time(times, count, mask); | ||
| right_->satisfy_batch_time(times, count, mask_right); | ||
| int pass = 0; | ||
| for (int i = 0; i < count; ++i) { | ||
| mask[i] = mask[i] || mask_right[i]; | ||
| if (mask[i]) ++pass; | ||
| } | ||
| return pass; | ||
| } |
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| int satisfy_batch_time(const int64_t* times, int count, bool* mask) { | ||
| bool mask_right[129]; | ||
| left_->satisfy_batch_time(times, count, mask); | ||
| right_->satisfy_batch_time(times, count, mask_right); | ||
| int pass = 0; | ||
| for (int i = 0; i < count; ++i) { | ||
| mask[i] = mask[i] && mask_right[i]; | ||
| if (mask[i]) ++pass; | ||
| } | ||
| return pass; | ||
| } |
| index_entry_.push_back(value); | ||
| map_size_ = map_size_ + value.length(); | ||
| entry_index_[value] = static_cast<int>(index_entry_.size()) - 1; | ||
| entry_index_[value] = entry_index_.size(); |
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| // page_mask_ is used as a bitmask and only works correctly for | ||
| // power-of-2 page sizes. Round up to the next power-of-2 so that | ||
| // (read_pos_ & page_mask_) gives the correct within-page offset and | ||
| // the page-crossing check doesn't misfire on arbitrary buffer sizes. | ||
| uint32_t ps = 1; | ||
| while (ps < (uint32_t)buf_len) ps <<= 1; | ||
| page_size_ = ps; | ||
| page_mask_ = ps - 1; | ||
| head_.store(&wrapped_page_); |
| } else if (RET_FAIL(write_file_footer())) { | ||
| std::cout << "writer file footer error, ret = " << ret << std::endl; | ||
| } else if (RET_FAIL(sync_file())) { | ||
| } else if (g_config_value_.sync_on_close_ && RET_FAIL(sync_file())) { |
| @@ -1,5 +1,5 @@ | |||
| #[[ | |||
| Licensed to the Apache Software Foundation (ASF) under one | |||
| Licensed to the Apache Software Foundation(ASF) under one | |||
|
|
||
| Unless required by applicable law or agreed to in writing, | ||
| software distributed under the License is distributed on an | ||
| software distributed under the LICENSE is distributed on an |
| file = write_file_new("test/", &error_no); | ||
| ASSERT_TRUE(error_no == RET_FILRET_OPEN_ERR || | ||
| error_no == RET_ALREADY_EXIST); | ||
| ASSERT_EQ(RET_FILRET_OPEN_ERR, error_no); |
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| @@ -1320,7 +1112,7 @@ TEST_F(TreeQueryByRowTest, DISABLED_QueryByRowFasterThanManualNext) { | |||
| write_test_file(devices, measurements, num_rows); | |||
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| const int num_iters = 5; | |||
| const double tolerance = 0.2; | |||
| const double tolerance = 0.05; | |||
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| uint32_t cur_points = value_page_writer_.get_point_numer(); | ||
| uint32_t page_remaining = | ||
| common::g_config_value_.page_writer_max_point_num_ - cur_points; | ||
| if (page_remaining == 0) { | ||
| if (RET_FAIL(seal_cur_page(false))) { | ||
| return ret; | ||
| } | ||
| page_remaining = | ||
| common::g_config_value_.page_writer_max_point_num_; | ||
| } |
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Summary
This PR optimizes the C++ TsFile read/write paths for batch and columnar workloads, and fixes several aligned table null-handling issues uncovered while validating the optimized path.
It consolidates the batch decode/write work from the long-lived optimization branch into a reviewable change for
develop.Supersedes #749, #754, and #774.
Main Changes
Decoderhierarchy and implement batch paths for PLAIN, TS2DIFF, and Gorilla.ChunkReaderandAlignedChunkReader, including shared timestamp decoding for aligned multi-value reads.ByteStream, compressor, and page/chunk writer internals used by the optimized paths.Correctness Fixes
ValuePageWriter::reset()so row count and null bitmap state are reset together.Compatibility Notes
cpp/third_party/is left atdevelopstate so existing platform compatibility fixes are preserved.Verification
cmake --build cpp/target/build --target TsFile_Test -j1ctest --test-dir cpp/target/build/test --output-on-failure -R '^TsFileTableReaderTest\.TestNullInTable4$'ctest --test-dir cpp/target/build/test --output-on-failure -j4cd cpp && mvn spotless:checkcd cpp && mvn apache-rat:checkCurrent full C++ test result:
496/496tests pass.