)]}' { "commit": "86252e512e2ce1003ae5c38ac3c1218172638274", "tree": "953810d5835423d15326ad37789182d0ffa2e04d", "parents": [ "3010c3de84b3ac1271a06e9f3b59882184cfd848" ], "author": { "name": "Colin Lee", "email": "105656576+ColinLeeo@users.noreply.github.com", "time": "Fri Jul 03 10:39:18 2026 +0800" }, "committer": { "name": "GitHub", "email": "noreply@github.com", "time": "Fri Jul 03 10:39:18 2026 +0800" }, "message": "C++: optimize batch read/write paths and aligned table null handling (#823)\n\n* TsFile C++: batch + SIMD + parallel read/write optimization\n\nBatch decode/encode APIs (PLAIN / TS2DIFF / Gorilla) with single-pass\nTsBlock decode, AVX2/NEON SIMD paths, a single process-wide worker pool\nfor chunk-level parallel read and column-parallel write, and batched\nNEON statistics. On-disk format unchanged; interoperable with Java/Python.\n\n* fix memory leak.\n\n* fix err.\n\n* fix comment.\n\n* format.\n\n* fix some ut err.\n\n* fix heap-use-after-free in multi-value aligned reader tests\n\nMultiValueAlignedSkipsBatchPreservesValueAlignment and\nMultiValueAlignedWideChunkParallelDecode constructed ColIterator locals\ninside the read loop and called ssi-\u003erevert_tsblock() (which frees the\nTsBlock and its column vectors) while those iterators were still in\nscope. ~ColIterator() calls vec_-\u003ereset_offset(), writing back into the\njust-freed vector at the closing brace of the loop body — a real\nuse-after-free that Linux Release+ASan flags and whose heap corruption\nthen cascaded into spurious SprintzCodec/CRelease failures later in the\nsame single-process run.\n\nScope the ColIterators in a nested block so they are destroyed before\nrevert_tsblock(). Verified on Linux x86_64 Release+ASan+UBSan: full\nsuite 701/701 pass, 0 ASan/UBSan reports.\n\n* fix device-node cache aliasing null tag with literal string \"null\"\n\nTsFileIOReader::get_cached_device_node keyed device_node_cache_ by\nIDeviceID::get_device_name(), which renders a null tag segment as the\nliteral text \"null\". A device with a real null tag (e.g. tags\n(null, b, c)) and a device whose tag value is the string \"null\"\n((\"null\", b, c)) therefore produce the identical name \"a.null.b.c\" and\ncollide in the cache: whichever device is queried first populates the\nentry, and every later query for the other device on the same reused\nreader gets the first device\u0027s cached MetaIndexNode and silently reads\nits chunks.\n\nThis surfaced through the Python dataset API, where one long-lived\nTsFileReader answers many per-device queries: the pytest\ntest_dataset_null_tag_positions_and_string_null_are_distinct read\n(null,b,c)\u0027s data for the (\"null\",b,c) device. The device metadata\nbinary search (DeviceIDComparable, segment-based) was always correct;\nonly the string cache key was lossy.\n\nKey the cache by a collision-free, length-prefixed encoding of the\nsegment vector that flags null segments explicitly, so a null tag can\nnever alias the string \"null\". Add a device_id unit test pinning the\ninvariant (names collide, segment equality distinguishes them).\n\nVerified: C++ suite 707/707 (Release+ASan+UBSan), Python suite 150/150.\n\n* build: don\u0027t use -march\u003dnative by default; gate it behind an option\n\nRelease builds unconditionally added -march\u003dnative on Linux/macOS. Two\nproblems for artifacts that leave the build host:\n\n1. Portability: a wheel/binary built on a newer CPU can fault with an\n illegal instruction on an older target machine.\n2. On virtualized macOS arm64 CI runners, -march\u003dnative mis-detects the\n feature set and drops +crc, while snappy\u0027s CRC32 feature probe (run\n without -march) still reports crc available and defines\n SNAPPY_HAVE_NEON_CRC32\u003d1. snappy.cc then calls the always_inline\n __crc32cw intrinsic in a TU compiled without crc support:\n error: always_inline function \u0027__crc32cw\u0027 requires target feature\n \u0027crc\u0027, but would be inlined into a function compiled without \u0027crc\u0027\n The default (portable) target for macOS arm64 keeps +crc, so snappy\u0027s\n fast path stays available while the binary stays portable.\n\nDefault Release flags are now -O3 -flto (LTO stays off on MinGW/Windows\nas before). -march\u003dnative is opt-in via -DTSFILE_ENABLE_NATIVE_ARCH\u003dON\nfor local-only builds that never ship. Applies uniformly to CI, wheels,\nand manual local builds.\n\nVerified: non-ASan Release (CI config) builds snappy cleanly and passes\n705/705; -DTSFILE_ENABLE_NATIVE_ARCH\u003dON restores -march\u003dnative.\n\n* fix comment.\n\n* fix simde.\n\n* fix memory leaks in TsFileSeriesScanIterator teardown\n\nThe SSI is placement-new\u0027d into mem_alloc\u0027d memory and torn down with\ndestroy() + mem_free() (TsFileIOReader::revert_ssi / alloc_ssi /\nalloc_multi_ssi), so ~TsFileSeriesScanIterator() never runs. Every\nheap-owning member therefore leaked its backing storage on each query;\ndestroy() only released some of them (itimeseries_index_, chunk_reader_,\ntsblock_). LeakSanitizer on Linux (Debug+ASan and Release+ASan) reported\nhundreds of Direct/Indirect leaks routed through the multi-value read\npath; macOS ASan has no LSan so it stayed hidden locally.\n\nRelease the remaining members explicitly in destroy():\n- tuple_desc_ (std::vector\u003cColumnSchema\u003e) — add TupleDesc::release()\n since reset() only clear()s and keeps capacity\n- value_chunk_meta_cursors_ (std::vector\u003c...::Iterator\u003e)\n- device_id_ (shared_ptr\u003cIDeviceID\u003e) — the leaked StringArrayDeviceID\n- measurement_name_ (std::string)\n\nVerified on Linux: Debug+ASan and Release+ASan both 705/705 with\n0 Direct / 0 Indirect leaks and 0 UBSan reports.\n\n* refine tablet.", "tree_diff": [ { "type": "modify", "old_id": "3197524827246d7429f96cf287cefd6364d7bdb7", "old_mode": 33261, "old_path": "cpp/CMakeLists.txt", "new_id": "75cc55a4fc5ef5d77ab3da6718149ae73685c083", "new_mode": 33261, "new_path": "cpp/CMakeLists.txt" }, { "type": "modify", "old_id": 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