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747ffd8776
this change is inspired by clang-tidy. it warns like:
```
[752/852] Building CXX object service/CMakeFiles/service.dir/migration_manager.cc.o
Warning: /home/runner/work/scylladb/scylladb/service/migration_manager.cc:891:71: warning: 'view' used after it was moved [bugprone-use-after-move]
891 | db.get_notifier().before_create_column_family(*keyspace, *view, mutations, ts);
| ^
/home/runner/work/scylladb/scylladb/service/migration_manager.cc:886:86: note: move occurred here
886 | auto mutations = db::schema_tables::make_create_view_mutations(keyspace, std::move(view), ts);
| ^
```
in which, `view` is an instance of view_ptr which is a type with the
semantics of shared pointer, it's backed by a member variable of
`seastar::lw_shared_ptr<const schema>`, whose move-ctor actually resets
the original instance. so we are actually accessing the moved-away
pointer in
```c++
db.get_notifier().before_create_column_family(*keyspace, *view, mutations, ts)
```
so, in this change, instead of moving away from `view`, we create
a copy, and pass the copy to
`db::schema_tables::make_create_view_mutations()`. this should be fine,
as the behavior of `db::schema_tables::make_create_view_mutations()`
does not rely on if the `view` passed to it is a moved away from it or not.
the change which introduced this use-after-move was 88a5ddabce
Refs 88a5ddabce
Fixes #18837
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
(cherry picked from commit 125464f2d9)
Closes scylladb/scylladb#18873