Fix Accord compaction purger tombstone logic
Accord compaction purgers see random slices of Accord state during compaction (based on randomly selected compaction inputs).
For at least the `durability` column in the `commands` table the tombstone being created when truncating was deleting the latest value since we can get enough information to truncate without actuall yhaving the latest `durability` value.
To fix we can wait to emit a tombstone until we are erasing the entire command row when truncating or truncating with outcome and meanwhile we can drop the extra columns that are no longer needed instead of using a tombstone. We don't need to emit cell tombstones we can drop them from the purger when processing each row.
patch by Ariel Weisberg; reviewed by David Capwell for CASSANDRA-18795
2 files changed
