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Validate snapshot sequence numbers on v3 tables - #4125
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The check that rejects a snapshot whose sequence number is not greater than the table's last sequence number only ran for format version 2. Java applies it to every format version after 1.
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Rationale for this change
The
AddSnapshotUpdatehandler only rejects a snapshot whose sequence number is not newer than the table'slast_sequence_numberwhen the format version is exactly 2, so on v3 tables a snapshot with a stale sequence number is accepted. Java'sTableMetadata.Builder.addSnapshotapplies this check for every format version after 1, so this changes== 2to>= 2.Are these changes tested?
Yes, added
test_add_snapshot_update_fails_with_stale_sequence_number, run against both the v2 and v3 table fixtures. The v3 case fails without the change.Are there any user-facing changes?
Committing a snapshot with a stale sequence number to a v3 table now raises the same
ValueErroras on v2.