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Complete vec0 DELETE: zero data, reclaim empty chunks, fix metadata rc bug (#268)

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When a row is deleted from a vec0 virtual table, the rowid slot in
_chunks.rowids and vector data in _vector_chunksNN.vectors are now
zeroed out (previously left as stale data, tracked in #54). When all
rows in a chunk are deleted (validity bitmap all zeros), the chunk and
its associated vector/metadata shadow table rows are reclaimed.

- Add vec0Update_Delete_ClearRowid to zero the rowid blob slot
- Add vec0Update_Delete_ClearVectors to zero all vector blob slots
- Add vec0Update_Delete_DeleteChunkIfEmpty to detect and delete
  fully-empty chunks from _chunks, _vector_chunksNN, _metadatachunksNN
- Fix missing rc check in ClearMetadata loop (bug: errors were silently
  ignored)
- Fix vec0_new_chunk to explicitly set _rowid_ on shadow table INSERTs
  (SHADOW_TABLE_ROWID_QUIRK: "rowid PRIMARY KEY" without INTEGER type
  is not a true rowid alias, causing blob_open failures after chunk
  delete+recreate cycles)
- Add 13 new tests covering rowid/vector zeroing, chunk reclamation,
  metadata/auxiliary/partition/text-PK/int8/bit variants, and
  page_count shrinkage verification
- Add vec0-delete-completeness fuzz target
- Update snapshots for new delete zeroing behavior

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Alex Garcia 2026-03-17 00:02:36 -07:00 • committed by GitHub
parent 5f4e5dd4dd
commit cb147c8834
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6 changed files with 732 additions and 24 deletions
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6
tests/fuzz/Makefile
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@ -69,9 +69,13 @@ $(TARGET_DIR)/vec_each: vec-each.c $(FUZZ_SRCS) | $(TARGET_DIR)
$(TARGET_DIR)/vec_mismatch: vec-mismatch.c $(FUZZ_SRCS) | $(TARGET_DIR)
$(FUZZ_CC) $(FUZZ_CFLAGS) $(FUZZ_SRCS) $< -o $@
$(TARGET_DIR)/vec0_delete_completeness: vec0-delete-completeness.c $(FUZZ_SRCS) | $(TARGET_DIR)
$(FUZZ_CC) $(FUZZ_CFLAGS) $(FUZZ_SRCS) $< -o $@
FUZZ_TARGETS = vec0_create exec json numpy \
shadow_corrupt vec0_operations scalar_functions \
vec0_create_full metadata_columns vec_each vec_mismatch
vec0_create_full metadata_columns vec_each vec_mismatch \
vec0_delete_completeness
all: $(addprefix $(TARGET_DIR)/,$(FUZZ_TARGETS))