replica/table: adjust the view read-before-write to return static rows when needed

Adjusts the read-before-write query issued in
`table::do_push_view_replica_updates` so that, when needed, requests
static columns and makes sure that the static row is present.

db/view/view.cc

@@ -1510,6 +1510,12 @@ future<query::clustering_row_ranges> calculate_affected_clustering_ranges(const
 
 }
 
+bool needs_static_row(const mutation_partition& mp, const std::vector<view_and_base>& views) {
+    // TODO: We could also check whether any of the views need static rows
+    // and return false if none of them do
+    return mp.partition_tombstone() || !mp.static_row().empty();
+}
+
 // Calculate the node ("natural endpoint") to which this node should send
 // a view update.
 //

db/view/view.hh

@@ -305,6 +305,8 @@ future<query::clustering_row_ranges> calculate_affected_clustering_ranges(
         const mutation_partition& mp,
         const std::vector<view_and_base>& views);
 
+bool needs_static_row(const mutation_partition& mp, const std::vector<view_and_base>& views);
+
 struct wait_for_all_updates_tag {};
 using wait_for_all_updates = bool_class<wait_for_all_updates_tag>;
 future<> mutate_MV(