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From: Vladislav Shpilevoy via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: imeevma@tarantool.org
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH v2 4/4] sql: introduce FINALIZE for custom aggregate
Date: Fri, 4 Feb 2022 00:30:24 +0100	[thread overview]
Message-ID: <d6d39667-4a78-8872-0b40-494fbf622fb9@tarantool.org> (raw)
In-Reply-To: <162eb863bee6a45a63ee85604ce004d83e8aedfa.1643722506.git.imeevma@gmail.com>

Thanks for the patch!

> Example:
> ```
> box.schema.func.create("F1_finalize", {
>     language = "Lua",
>     body = [[
>         function(state)
>             if state == nil then
>                 return 0
>             end
>             return state.sum / state.count
>         end
>     ]],
>     param_list = {"map"},
>     returns = "number",
>     exports = {'LUA', 'SQL'},
> })

I thought of another approach - let to call the function any name,
make {aggregate = "finalize", source = "F1"}. So it is like a foreign
key. But up to you whether you like it and whether you will try to bring
it up with the product managers.

> box.execute('SELECT f1(i) FROM t;')

The commit technically LGTM.

  reply	other threads:[~2022-02-03 23:30 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-01 13:37 [Tarantool-patches] [PATCH v2 0/4] Introduce custom aggregate function Mergen Imeev via Tarantool-patches
2022-02-01 13:37 ` [Tarantool-patches] [PATCH v2 1/4] sql: fix COUNT() optimization conditions Mergen Imeev via Tarantool-patches
2022-02-01 13:37 ` [Tarantool-patches] [PATCH v2 2/4] sql: drop unnecessary P2 register for OP_AggFinal Mergen Imeev via Tarantool-patches
2022-02-01 13:37 ` [Tarantool-patches] [PATCH v2 3/4] sql: introduce custom aggregate functions Mergen Imeev via Tarantool-patches
2022-02-03 23:29   ` Vladislav Shpilevoy via Tarantool-patches
2022-02-01 13:37 ` [Tarantool-patches] [PATCH v2 4/4] sql: introduce FINALIZE for custom aggregate Mergen Imeev via Tarantool-patches
2022-02-03 23:30   ` Vladislav Shpilevoy via Tarantool-patches [this message]
2022-02-10  9:21     ` Mergen Imeev via Tarantool-patches
2022-02-10  9:14 [Tarantool-patches] [PATCH v2 0/4] Introduce custom aggregate functions Mergen Imeev via Tarantool-patches
2022-02-10  9:14 ` [Tarantool-patches] [PATCH v2 4/4] sql: introduce FINALIZE for custom aggregate Mergen Imeev via Tarantool-patches

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