The write path uses a base schema at a particular version, and we
want it to use the materialized views at the corresponding version.
To achieve this, we need to map the state currently in db::view::view
to a particular schema version, which this patch does by introducing
the view_info class to hold the state previously in db::view::view,
and by having a view schema directly point to it.
The changes in the patch are thus:
1) Introduce view_info to hold the extra view state;
2) Point to the view_info from the schema;
3) Make the functions in the now stateless db::view::view non-member;
4) Remove the db::view::view class.
All changes are structural and don't affect current behavior.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
This adds a function mutate_MV() which takes view mutations and sends
them to the appropriate nodes (this may be the current node, or a
remote node).
This is only a partial implementation - we still don't do the local
batch log (to survive reboots and failures) and some other stuff which
is left commented out.
Signed-off-by: Nadav Har'El <nyh@scylladb.com>
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
This patch adds the view_update_builder class, which is responsible
for calculating the mutations to apply to a column family's
materialized views, given a streamed_mutation representing an update
to the base table and a streamed_mutation representing the
pre-existing rows which the update covers.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
To help calculate the view mutations from a base update, we store in
the view class the column that's part of the view's primary key but
not part of the base's, if such column exists.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
This patch adds the matches_view_filter() function which specifies
whether a given base row matches the view filter. Unlike
may_be_affected_by(), this function has no false positives.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
This patch adds the may_be_affected_by() function to the view class,
which is responsible to determine whether an update to a base class
affects one of its views.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
This patch adds the view class, which will contains functions related
to populating a view, either from the base table's write path or from
the view building mechanism which copies over already existing data in
the base table.
Signed-off-by: Duarte Nunes <duarte@scylladb.com>
