[PATCH v5 3/3] box: introduce func_index

[Vladimir Davydov]

On Fri, Jul 26, 2019 at 12:57:43PM +0300, Konstantin Osipov wrote:
> * Vladimir Davydov <vdavydov.dev at gmail.com> [19/07/26 12:54]:
> > 
> > There's one thing about _func_index space that keeps bothering me: since
> > insertion of a tuple into this space is a yielding operation and this
> > operation is executed after insertion of a tuple into _index, we won't
> > be able to wrap space.create_index() into box.begin/commit, because only
> > the first DDL statement in a transaction is allowed to be yielding.
> 
> I think we agreed to solve this to build func index at recovery
> in _func_index trigger and at create in _func trigger. 

I don't understand how it's connected with recovery. Could you please
elaborate?

Just to be clear, I mean the following:

space.create_index():
  _index:insert{...}
  _func_index:insert{...}

The latter may yield so we can't use box.begin/commit in
space.create_index() Lua function.