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Date: Wed, 24 Jul 2019 23:22:42 +0300
From: Konstantin Osipov <kostja@tarantool.org>
Subject: Re: [PATCH v4 4/4] box: introduce functional indexes
Message-ID: <20190724202242.GF7651@atlas>
References: <cover.1563953154.git.kshcherbatov@tarantool.org>
 <e244e92d21226c8a869d9d87987ccc9cf21af803.1563953154.git.kshcherbatov@tarantool.org>
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In-Reply-To: <e244e92d21226c8a869d9d87987ccc9cf21af803.1563953154.git.kshcherbatov@tarantool.org>
To: Kirill Shcherbatov <kshcherbatov@tarantool.org>
Cc: tarantool-patches@freelists.org, vdavydov.dev@gmail.com
List-ID: <tarantool-patches.dev.tarantool.org>

* Kirill Shcherbatov <kshcherbatov@tarantool.org> [19/07/24 10:38]:
> lua_code = [[function(tuple)
>                 local address = string.split(tuple[2])
>                 local ret = {}
>                 for _, v in pairs(address) do
> 			table.insert(ret, {utf8.upper(v)})
> 		end
>                 return unpack(ret)
>              end]]

I think the convention should be that a multikey function must always
return a table (a msgpack array for a C function).

It's OK to wrap every key into a table as long as it simplifies 
the code (key part count is encoded automatically by struct port), but otherwise 
I would stick to scalars.


-- 
Konstantin Osipov, Moscow, Russia