view_update_builder: Construct with data dictionary

The caller is table with view-update-generator at hand (it calls
mutate_MV on). Builder here is used as a temporary object that destroys
once the caller coroutine co_return-s, so keeping the database obtained
from the view-update-generator is safe.

Later the v.u.b. object will propagate its data dictionary down the
callstacks.

Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>

db/view/view.cc

@@ -1439,6 +1439,7 @@ future<stop_iteration> view_update_builder::on_results() {
 }
 
 view_update_builder make_view_update_builder(
+        data_dictionary::database db,
         const replica::table& base_table,
         const schema_ptr& base,
         std::vector<view_and_base>&& views_to_update,
@@ -1454,7 +1455,7 @@ view_update_builder make_view_update_builder(
         bool is_index = base_table.get_index_manager().is_index(v.view);
         return view_updates(std::move(v), is_index);
     }));
-    return view_update_builder(base_table, base, std::move(vs), std::move(updates), std::move(existings), now);
+    return view_update_builder(std::move(db), base_table, base, std::move(vs), std::move(updates), std::move(existings), now);
 }
 
 future<query::clustering_row_ranges> calculate_affected_clustering_ranges(const schema& base,

db/view/view.hh

@@ -14,6 +14,7 @@
 #include "schema/schema_fwd.hh"
 #include "readers/flat_mutation_reader_v2.hh"
 #include "mutation/frozen_mutation.hh"
+#include "data_dictionary/data_dictionary.hh"
 
 class frozen_mutation_and_schema;
 
@@ -244,6 +245,7 @@ private:
 };
 
 class view_update_builder {
+    data_dictionary::database _db;
     const replica::table& _base;
     schema_ptr _schema; // The base schema
     std::vector<view_updates> _view_updates;
@@ -259,12 +261,13 @@ class view_update_builder {
     partition_key _key = partition_key::make_empty();
 public:
 
-    view_update_builder(const replica::table& base, schema_ptr s,
+    view_update_builder(data_dictionary::database db, const replica::table& base, schema_ptr s,
         std::vector<view_updates>&& views_to_update,
         flat_mutation_reader_v2&& updates,
         flat_mutation_reader_v2_opt&& existings,
         gc_clock::time_point now)
-            : _base(base)
+            : _db(std::move(db))
+            , _base(base)
             , _schema(std::move(s))
             , _view_updates(std::move(views_to_update))
             , _updates(std::move(updates))
@@ -298,6 +301,7 @@ private:
 };
 
 view_update_builder make_view_update_builder(
+        data_dictionary::database db,
         const replica::table& base_table,
         const schema_ptr& base_schema,
         std::vector<view_and_base>&& views_to_update,