From: daidewei@highgo.com <daidewei@highgo.com>
To: pgsql-bugs@lists.postgresql.org <pgsql-bugs@lists.postgresql.org>
Subject: a plpgsql bug
Date: Tue, 19 Sep 2023 10:59:07 +0800
Message-ID: <202309191058550158453@highgo.com> (raw)
helloļ¼
I found a problem in plpgsql. When there is a large loop in plpgsql, it is found that the change of search_path will cause memory exhaustion and thus disconnect the connection.
The test examples are as follows:
1 create a schema
create schema test_schema;
2 create a function create or replace function test_schema.test_f(id integer) returns integer as $$ declare var2 integer := 1; begin if id % 4 = 1 then return var2 + 2; elseif id % 4 = 2 then return var2 + 3; elseif id % 4 = 3 then return var2 + 4; else return var2; end if; end; $$ language plpgsql;
3 a loop in plpgsql,which wil result disconnection. do $$ declare var1 integer; begin for id in 1 .. 10000000 LOOP set search_path to test_schema; var1 = test_schema.test_f(id); set search_path to public; var1 = test_schema.test_f(id); end loop; end; $$ language plpgsql;
daidewei@highgo.com
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To: pgsql-bugs@postgresql.org
Cc: daidewei@highgo.com, pgsql-bugs@lists.postgresql.org
Subject: Re: a plpgsql bug
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