Hello, thank you very much for your reply. But I think you may have
misunderstood what we have done.
What we do this time is that we can use multiple range ranges
(condition_iterator) after in. Previously, we can only use such an interval
[lower, upper] after in, but in some scenarios, we may need a list: condition_
iterator[,condition_iterator ...]
condition_iterator:
[ REVERSE ] expression .. expression [ BY expression ]
Thanks again!
songjinzhou (2903807...@qq.com)
From: Pavel Stehule
Date: 2023-01-19 21:04
To: 2903807...@qq.com
CC: pgsql-hackers; 1276576182
Subject: Re: Support plpgsql multi-range in conditional control
Hi
čt 19. 1. 2023 v 10:23 odesílatel 2903807...@qq.com <2903807...@qq.com> napsal:
Dear hackers, my good friend Hou Jiaxing and I have implemented a version of
the code that supports multiple integer range conditions in the in condition
control of the for loop statement in the plpgsql procedural language. A typical
example is as follows:
postgres=# do $$
declare
i int := 10;
begin
for i in 1..10 by 3, reverse i+10..i+1 by 3 loop
raise info '%', i;
end loop;
end $$;
INFO: 1
INFO: 4
INFO: 7
INFO: 10
INFO: 20
INFO: 17
INFO: 14
INFO: 11
do
postgres=#
Hope to get your feedback, thank you!
I don't like it. The original design of ADA language is to be a safe and simple
language. Proposed design is in 100% inversion.
What use case it should to support?
Regards
Pavel
2903807...@qq.com
