Currently when a partition is deleted from the base table, we generate a
row tombstone update for each one of the view rows in the partition.
When the partition key in the view is the same as the base, maybe in a
different order, this can be done more efficiently - The whole corresponding
view partition can be deleted with one partition tombstone update.
With this commit, when generating view updates, if the update mutation has a
partition tombstone then for the views which have the same partition key
we will generate a partition tombstone update, and skip the individual
row tombstone updates.
Fixesscylladb/scylladb#8199Closesscylladb/scylladb#19338
* github.com:scylladb/scylladb:
mv: skip reading rows when generating partition tombstone update
mv: delete a partition in a single operation when applicable
cql-pytest: move ScyllaMetrics to util file to allow reuse
39b49a41cc