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4e693383f7
This patch replaces the current row tombstone representation by a row_tombstone. The intent of the patch is thus to reify the idea of shadowable tombstones, that up until now we considered all materialized view row tombstones to be. We need to distinguish shadowable from non-shadowable row tombstones to support scenarios such as, when inserting to a table with a materialzied view: 1. insert into base (p, v1, v2) values (3, 1, 3) using timestamp 1 2. delete from base using timestamp 2 where p = 3 3. insert into base (p, v1) values (3, 1) using timestamp 3 These should yield a view row where v2 is definitely null, but with the current implementation, v2 will pop back with its value v2=3@TS=1, even though its dead in the base row. This is because the row tombstone inserted at 2) is a shadowable one. This patch only addresses the memory representation of such row_tombstones. Signed-off-by: Duarte Nunes <duarte@scylladb.com>