Fix strip spec-mandated DV blob framing before deserializing#3576
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Rationale for this change
Fix
_payloadstoringpuffin[8:]instead ofpuffin— blob offsetsin the footer are file-relative (from byte 0), not relative to byte 8.
The two bugs cancelled for single-blob files at offset 4; the fix was
only testable once PuffinFile supported multi-blob/compressed files.
Also widen
PuffinBlobMetadata.typefromLiteral["deletion-vector-v1"]to
strsoPuffinFilecan parse files containing non-DV blobs withouta Pydantic validation error.
Are these changes tested?
Yes. Copied files from https://github.com/apache/iceberg/tree/main/core/src/test/resources/org/apache/iceberg/puffin/v1
sample-metric-data-compressed-zstd.binwill be added separately in #3575Are there any user-facing changes?
No