[tarantool-patches] Re: [PATCH] sql: disallow to rename space if it is referenced by view

[Konstantin Osipov <kostja@tarantool.org>]

* Nikita Pettik <korablev@tarantool.org> [18/12/09 20:53]:
> Before this patch it was allowed to rename space which is referenced by
> a view. In turn, view contains SELECT statement in a raw form (i.e. as a
> string) and it is not modified during renaming routine. Hence, after
> renaming space still has referencing counter > 0, but no usage of view
> is allowed (since execution of SELECT results in "Space does not
> exist"). To avoid such situations, lets ban renaming space if its view
> reference counter > 0.
> 
> Note that RENAME is ANSI extension, so different DBs behave in this case
> in different ways - some of them allow to rename tables referenced by a
> view (PostgreSQL), others - don't (Oracle).
> 
> Closes #3746
> ---
> Branch: https://github.com/tarantool/tarantool/tree/np/gh-3746-view-rename
> Issue: https://github.com/tarantool/tarantool/issues/3746
> 
>  src/box/alter.cc       | 6 ++++++
>  test/sql/view.result   | 6 ++++++
>  test/sql/view.test.lua | 3 +++
>  3 files changed, 15 insertions(+)
> 
> diff --git a/src/box/alter.cc b/src/box/alter.cc
> index 029da029e..f3b267401 100644
> --- a/src/box/alter.cc
> +++ b/src/box/alter.cc
> @@ -1823,6 +1823,12 @@ on_replace_dd_space(struct trigger * /* trigger */, void *event)
>  				  space_name(old_space),
>  				  "can not convert a space to "
>  				  "a view and vice versa");
> +		if (strcmp(def->name, old_space->def->name) != 0 &&
> +		    old_space->def->view_ref_count > 0)
> +			tnt_raise(ClientError, ER_ALTER_SPACE,
> +				  space_name(old_space),
> +				  "can not rename space which is referenced by "
> +				  "view");

Please specify which view is referencing this space in the error
message.

-- 
Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
http://tarantool.io - www.twitter.com/kostja_osipov