SavicStefan opened a new pull request, #59927:
URL: https://github.com/apache/spark/pull/59927
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### What changes were proposed in this pull request?
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`is_valid_variant` now checks the final offset of every object and array. It
returns false when:
1. The final offset is missing (an empty array `[3, 0]` or an empty object
`[2, 0]`).
2. The final offset points past the end of the value (`[3, 0, 5]`).
3. A child does not end within its container's data.
Unused bytes inside a containers data are still allowed.
### Why are the changes needed?
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`is_valid_variant` returned true for malformed variants. A container with n
children needs n + 1 offsets, but the final offset was never read, so an empty
array or object without it was accepted and its value was not checked either,
so a container or child extending past its bounds was also accepted. Such
values can later fail with `MALFORMED_VARIANT` or be silently truncated when
subvalues are extracted.
### Does this PR introduce _any_ user-facing change?
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Yes. `is_valid_variant` now returns false for the malformed variants
described above, where it previously returned true. Valid variants are not
affected.
### How was this patch tested?
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Added cases to `VariantExpressionSuite` "is_valid_variant":
- Final offset missing: empty array, empty object, truncated 4-byte
offset, 4-byte size header, nested empty array.
- Final offset past the end of the value: empty array and empty object
with final offset 5.
- Child not ending within its container: array element, object field,
element starting at the final offset, nested array, long string.
- Still valid: unused bytes in container data, unused bytes between
children, object fields not in offset order, trailing bytes after the top-level
value, complete empty containers with 4-byte offset and 4-byte size headers.
- Variants built by `parse_json` (nested, empty, long strings, duplicate
keys) are valid.
### Was this patch authored or co-authored using generative AI tooling?
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Generated-by: Claude Code (Claude Opus 5.5)
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