From: Oleg Babin via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Timur Safin <tsafin@tarantool.org>, v.shpilevoy@tarantool.org
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH resend v2 08/11] lua, datetime: calculated attributes for datetimes
Date: Sat, 31 Jul 2021 09:31:03 +0300 [thread overview]
Message-ID: <378606f5-02d7-68a2-4efe-8fc68e7fef83@tarantool.org> (raw)
In-Reply-To: <045501d78592$8167c560$84375020$@tarantool.org>
Thanks for your reply. See my comment below.
On 31.07.2021 01:30, Timur Safin wrote:
> Hello Oleg again!
>
> :
> :
> : On 28.07.2021 13:34, Timur Safin via Tarantool-patches wrote:
> : > * introduced a set of calculated attributes to data object, e.g.:
> : > - timestamp, seconds, microseconds, minute, or hours
> : >
> : > Part of #5941
> : > ---
> : > src/lua/datetime.lua | 51 ++++++++++++++++++++++------------
> : > test/app-tap/datetime.test.lua | 17 +++++++++++-
> : > 2 files changed, 50 insertions(+), 18 deletions(-)
> : >
> : > diff --git a/src/lua/datetime.lua b/src/lua/datetime.lua
> : > index 9ec06d8d8..7a208cef9 100644
> : > --- a/src/lua/datetime.lua
> : > +++ b/src/lua/datetime.lua
> : > @@ -224,6 +224,36 @@ local function interval_serialize(self)
> : > return { secs = self.secs, nsec = self.nsec }
> : > end
> : >
> : > +local datetime_index = function(self, key)
> : > + local attributes = {
> :
> : This change looks like pessimization because currently we need to
> : recreate "attributes" table
> :
> : for each function call. I suggest to use `attributes` as `__index` but
> : not such function.
>
> What would you say if I simply precache this attributes table in local,
> and then proceed this way?
> -----------------------------------------
> -local datetime_index = function(self, key)
> - local attributes = {
> +local datetime_index_handlers = {
> unixtime = function(self)
> return self.secs
> end,
> +
> timestamp = function(self)
> return tonumber(self.secs) + self.nsec / 1e9
> end,
> +
> nanoseconds = function(self)
> return self.secs * 1e9 + self.nsec
> end,
> +
> microseconds = function(self)
> return self.secs * 1e6 + self.nsec / 1e3
> end,
> +
> milliseconds = function(self)
> return self.secs * 1e3 + self.nsec / 1e6
> end,
> +
> seconds = function(self)
> return tonumber(self.secs) + self.nsec / 1e9
> end,
> +
> minutes = function(self)
> return (tonumber(self.secs) + self.nsec / 1e9) / 60
> end,
> +
> hours = function(self)
> return (tonumber(self.secs) + self.nsec / 1e9) / (60 * 60)
> end,
> +
> days = function(self)
> return (tonumber(self.secs) + self.nsec / 1e9) / (60 * 60) / 24
> end,
> +
> add = function(self)
> return function(self, o)
> return interval_increment(self, o, 1)
> end
> end,
> +
> sub = function(self)
> return function(self, o)
> return interval_increment(self, o, -1)
> end
> end,
> }
> - return attributes[key] ~= nil and attributes[key](self) or nil
> +
> +local datetime_index = function(self, key)
> + return datetime_index_handlers[key] ~= nil and
> + datetime_index_handlers[key](self) or nil
> end
> -----------------------------------------
>
> I mean we still carefully check existence of an asked key, and return nil if
> there is no such key at all. Is it much different than what you've meant?
>
It's again about temporary tables. I gave a benchmark in one of the
previous emails.
After changes it shoud be better. Thanks.
next prev parent reply other threads:[~2021-07-31 6:31 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 10:34 [Tarantool-patches] [PATCH resend v2 00/11] Initial datetime support Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 01/11] build: add Christian Hansen c-dt to the build Timur Safin via Tarantool-patches
2021-07-29 23:40 ` Vladislav Shpilevoy via Tarantool-patches
2021-07-31 9:22 ` Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 02/11] lua: built-in module datetime Timur Safin via Tarantool-patches
2021-07-29 18:55 ` Oleg Babin via Tarantool-patches
2021-07-30 19:00 ` Timur Safin via Tarantool-patches
2021-07-31 6:29 ` Oleg Babin via Tarantool-patches
2021-07-31 16:51 ` Timur Safin via Tarantool-patches
2021-07-29 23:36 ` Vladislav Shpilevoy via Tarantool-patches
2021-07-30 15:39 ` Timur Safin via Tarantool-patches
2021-08-01 17:01 ` Vladislav Shpilevoy via Tarantool-patches
2021-08-01 20:23 ` Timur Safin via Tarantool-patches
2021-08-04 23:57 ` Vladislav Shpilevoy via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 03/11] lua, datetime: datetime tests Timur Safin via Tarantool-patches
2021-07-29 18:55 ` Oleg Babin via Tarantool-patches
2021-07-30 20:45 ` Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 04/11] lua, datetime: display datetime Timur Safin via Tarantool-patches
2021-07-29 18:55 ` Oleg Babin via Tarantool-patches
2021-07-30 21:48 ` Timur Safin via Tarantool-patches
2021-07-31 6:29 ` Oleg Babin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 05/11] box, datetime: add messagepack support for datetime Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 06/11] box, datetime: datetime comparison for indices Timur Safin via Tarantool-patches
2021-07-29 18:56 ` Oleg Babin via Tarantool-patches
2021-07-30 22:18 ` Timur Safin via Tarantool-patches
2021-07-31 6:30 ` Oleg Babin via Tarantool-patches
2021-07-31 9:31 ` Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 07/11] lua, datetime: proper datetime encoding Timur Safin via Tarantool-patches
2021-07-29 18:57 ` Oleg Babin via Tarantool-patches
2021-07-30 22:20 ` Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 08/11] lua, datetime: calculated attributes for datetimes Timur Safin via Tarantool-patches
2021-07-29 18:57 ` Oleg Babin via Tarantool-patches
2021-07-30 22:30 ` Timur Safin via Tarantool-patches
2021-07-31 6:31 ` Oleg Babin via Tarantool-patches [this message]
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 09/11] lua, datetime: time intervals support Timur Safin via Tarantool-patches
2021-07-29 18:58 ` Oleg Babin via Tarantool-patches
2021-07-30 22:58 ` Timur Safin via Tarantool-patches
2021-07-31 6:31 ` Oleg Babin via Tarantool-patches
2021-07-31 9:20 ` Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 10/11] lua, datetime: unixtime, timestamp setters in datetime.lua Timur Safin via Tarantool-patches
2021-07-29 18:58 ` Oleg Babin via Tarantool-patches
2021-07-30 23:11 ` Timur Safin via Tarantool-patches
2021-07-31 6:31 ` Oleg Babin via Tarantool-patches
2021-07-31 9:54 ` Timur Safin via Tarantool-patches
2021-07-28 10:34 ` [Tarantool-patches] [PATCH resend v2 11/11] datetime: changelog for datetime module Timur Safin via Tarantool-patches
2021-07-29 18:55 ` [Tarantool-patches] [PATCH resend v2 00/11] Initial datetime support Oleg Babin via Tarantool-patches
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