Re: Bytea PL/Perl transform - Mailing list pgsql-hackers

From Ivan Panchenko
Subject Re: Bytea PL/Perl transform
Date
Msg-id 1689888552.84649942@f381.i.mail.ru
Whole thread Raw
In response to Re: Bytea PL/Perl transform  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Bytea PL/Perl transform
List pgsql-hackers
Friday, 14 July 2023, 23:27 +03:00 от Tom Lane <tgl@sss.pgh.pa.us>:
 
Ivan Panchenko <wao@mail.ru> writes:
> Четверг, 6 июля 2023, 14:48 +03:00 от Peter Eisentraut < peter@eisentraut.org >:
>> If the transform deals with a built-in type, then they should just be
>> added to the respective pl extension directly.

> The new extension bytea_plperl can be easily moved into plperl now, but what should be do with the existing ones, namely jsonb_plperl and bool_plperl ?
> If we leave them where they are, it would be hard to explain why some transforms are inside plperl while other ones live separately. If we move them into plperl also, wouldn’t it break some compatibility?

It's kind of a mess, indeed. But I think we could make plperl 1.1
contain the additional transforms and just tell people they have
to drop the obsolete extensions before they upgrade to 1.1.
Fortunately, it doesn't look like functions using a transform
have any hard dependency on the transform, so "drop extension
jsonb_plperl" followed by "alter extension plperl update" should
work without cascading to all your plperl functions.

Having said that, we'd still be in the position of having to
explain why some transforms are packaged with plperl and others
not. The distinction between built-in and contrib types might
be obvious to us hackers, but I bet a lot of users see it as
pretty artificial. So maybe the existing packaging design is
fine and we should just look for a way to reduce the code
duplication.
The code duplication between different transforms is not in C code, but mostly in copy-pasted Makefile, *.control, *.sql and meson-build. These files could be generated from some universal templates. But, keeping in mind Windows compatibility and presence of three build system, this hardly looks like a simplification.
Probably at present time it would be better to keep the existing code duplication until plperl 1.1.
Nevertheless, dealing with code duplication is a wider task than the bytea transform, so let me suggest to keep this extension in the present form. If we decide what to do with the duplication, it would be another patch.

The mesonified and rebased version of the transform patch is attached.

regards, tom lane
 
Regards, Ivan
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