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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Mike Knowsley <mike.knowsley@bidorbuy.co.za>
cc: pgsql-bugs@lists.postgresql.org
Subject: Re: Can not cancel a call to a function that has opened a refcursor
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Comments: In-reply-to Mike Knowsley <mike.knowsley@bidorbuy.co.za>
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Mike Knowsley <mike.knowsley@bidorbuy.co.za> writes:
> A request to cancel a call to a function does not cancel the function if=
 the function has opened a refcursor which it is returning.

As far as I can see, there is no such bug; you're just misunderstanding
when the query referenced by the cursor will execute.  The function
test_delay_in_refcursor() sets up the cursor and returns basically
immediately (certainly in much less than 2 seconds), so the timeout
you have in the JDBC code will never fire.  The expected pg_sleep(5)
won't execute till you try to fetch something from the refcursor.

Trying this manually in psql, I get

...
CREATE FUNCTION
regression=3D# \timing
Timing is on.
regression=3D# begin;
BEGIN
Time: 0.306 ms
regression=3D*# select test_delay_in_refcursor();
 test_delay_in_refcursor =

-------------------------
 <unnamed portal 1>
(1 row)

Time: 0.314 ms
regression=3D*# fetch from "<unnamed portal 1>";
 ?column? | pg_sleep =

----------+----------
 test     | =

(1 row)

Time: 5005.475 ms (00:05.005)

I could have canceled the FETCH (and doing so works);
but I'm way too old and slow to cancel the submillisecond
setup step.

			regards, tom lane