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Date: Wed, 6 Mar 2019 19:43:01 +0300
From: Vladimir Davydov <vdavydov.dev@gmail.com>
Subject: Re: [PATCH v2] box: add on_schema_init trigger
Message-ID: <20190306164300.aqwgdivl4ef5o7ty@esperanza>
References: <20190305155309.32516-1-sergepetrenko@tarantool.org>
 <20190305185906.GC7992@chai>
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To: Konstantin Osipov <kostja@tarantool.org>
Cc: Serge Petrenko <sergepetrenko@tarantool.org>, tarantool-patches@freelists.org
List-ID: <tarantool-patches.dev.tarantool.org>

On Tue, Mar 05, 2019 at 09:59:06PM +0300, Konstantin Osipov wrote:
> * Serge Petrenko <sergepetrenko@tarantool.org> [19/03/05 18:57]:
> > If you want to change space's `space_name` storage engine to `vinyl`
> > , you may say:
> > ```
> > function trig(old, new)
> >     if new[3] == 'space_name' and new[4] ~= 'vinyl' then
> >         return box.tuple.new{new[1], new[2], new[3], 'vinyl',
> >                              new[5], new[6], new[7]}
> >     end
> > end
> > ```
> 
> Please access tuple fields by their names ;)

Unfortunately, we can't - formats are not set in schema_init(), they are
recovered from the snapshot. Probably, we can fix that.