Cut chunks where a character ends - #64
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📝 WalkthroughWalkthroughThe tokenizer now uses PostgreSQL multibyte support to calculate bounded offsets and clip them at complete characters. A new regression test covers non-ASCII stripping, two-, three-, and four-byte UTF-8 characters, overlap, hybrid and markdown strategies, vectorized reads, and configuration restoration. The Makefile includes the new test in the 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 1
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In `@src/tokenizer.c`:
- Around line 132-137: Update the limit calculation before strnlen so only the
byte span is capped at INT_MAX, while pg_mbcharcliplen receives estimated_chars
capped independently at INT_MAX. Preserve the requested character limit for
large ASCII inputs instead of reusing the byte-span limit, using the existing
variables and return flow.
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Makefilesrc/tokenizer.ctest/sql/multibyte_chunking.sql
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get_char_offset_for_tokens() counted UTF-8 lead bytes and returned the cursor one byte past the last one, so the offset landed inside a multi-byte character. Callers cut there with pnstrdup() and nothing downstream validates the encoding, so the fragment was stored -- the same fault as 358cbe8, one layer up, and length() raises on the row in the same way. enable_vectorization() did not get that far: it aborted partway through "Processing existing rows". pg_mbcharcliplen() clips to the last character that fits entirely, and reads the server encoding rather than assuming UTF-8. chunk_by_tokens(), split_oversized_chunks() and elements_to_chunks_simple() all reach the boundary through this one function. The read is bounded at what the wanted characters can occupy, so it still costs one chunk rather than the whole remaining document. That byte span and the character limit saturate at INT_MAX independently, in int64 so the product cannot wrap: the SQL entry point takes an unbounded chunk_size, and shrinking the character limit to keep the byte span in range would return fewer characters than were asked for and cut the chunk short. A text datum cannot exceed 1GB, so a saturated byte bound just means "to the end". Only reachable with pgedge_vectorizer.strip_non_ascii off, which is why it went unnoticed: the default turns every non-ASCII byte into a space, leaving nothing multi-byte to cut. The new test covers both settings, the default having had none at all, across two-, three- and four-byte characters and all three strategies. Text with ASCII spaces already passed, since a found break point is a space and a space cannot occur inside a multi-byte sequence; it is kept as a control.
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Verified the fix against all call sites (chunking.c, hybrid_chunking.c) and built + ran the new multibyte_chunking test plus full regression/TAP suite locally — all pass. CodeRabbit's integer-clamping finding was already addressed in the current commit.
- Add the [1.1-beta1] changelog section, backfilling entries for #47-#51, #55, #57, #58 and #64 that had accumulated in [Unreleased] without a changelog entry - pgedge_vectorizer.control's default_version stays '1.1'; this release pipeline keeps pre-release maturity in the git tag/packaging channel rather than the extension version, so no SQL upgrade script is needed for the beta suffix itself Release-Date: 2026-08-18
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get_char_offset_for_tokens() counted UTF-8 lead bytes and returned the cursor one byte past the last one, so the offset landed inside a multi-byte character. Callers cut there with pnstrdup() and nothing downstream validates the encoding, so the fragment was stored -- the same fault as 358cbe8, one layer up, and length() raises on the row in the same way. enable_vectorization() did not get that far: it aborted partway through "Processing existing rows".
pg_mbcharcliplen() clips to the last character that fits entirely, and reads the server encoding rather than assuming UTF-8. The read is bounded at what the wanted characters can occupy, so it still costs one chunk rather than the whole remaining document, and that product is clamped into an int because the SQL entry point takes an unbounded chunk_size. chunk_by_tokens(), split_oversized_chunks() and elements_to_chunks_simple() all reach the boundary through this one function.
Only reachable with pgedge_vectorizer.strip_non_ascii off, which is why it went unnoticed: the default turns every non-ASCII byte into a space, leaving nothing multi-byte to cut. The new test covers both settings, the default having had none at all, across two-, three- and four-byte characters and all three strategies. Text with ASCII spaces already passed, since a found break point is a space and a space cannot occur inside a multi-byte sequence; it is kept as a control.